var-200412-0263

Vulnerability from variot

The DSS verification code in Dropbear SSH Server before 0.43 frees uninitialized variables, which might allow remote attackers to gain access. Dropbear SSH is affected by an unspecified Digital Signal Standard (DSS) authentication vulnerability. The impact of this issue is currently unknown. Presumably, an attacker could use this issue to gain unauthorized access to a computer running the vulnerable application, but this is not confirmed. We will update this BID as more information emerges. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1

Cisco Security Advisory: Cisco Unified IP Phone Overflow and Denial of Service Vulnerabilities

Revision 1.0

For Public Release 2008 February 13 1600 UTC (GMT)

+--------------------------------------------------------------------

Summary

Cisco Unified IP Phone models contain multiple overflow and denial of service (DoS) vulnerabilities. There are workarounds for several of these vulnerabilities. Cisco has made free software available to address this issue for affected customers.

This advisory is posted at:

http://www.cisco.com/warp/public/707/cisco-sa-20080213-phone.shtml

Affected Products

Vulnerable Products +------------------

The following Cisco Unified IP Phone devices running Skinny Client Control Protocol (SCCP) firmware:

7906G
7911G
7935
7936
7940
7940G
7941G
7960
7960G
7961G
7970G
7971G

The following Cisco Unified IP Phone devices running Session Initiation Protocol (SIP) firmware:

7940
7940G
7960
7960G

The version of firmware running on an IP Phone can be determined via the Settings menu on the phone or via the phone HTTP interface.

Products Confirmed Not Vulnerable +--------------------------------

No other Cisco products are known to be vulnerable. This includes the following Cisco Unified IP Phone devices:

7931
7937
7942
7945
7965
7975

Details

SCCP and SIP-Related Vulnerabilities

DNS Response Parsing Overflow

Cisco Unified IP Phone 7940, 7940G, 7960 and 7960G devices running SCCP and SIP firmware contain a buffer overflow vulnerability in the handling of DNS responses. A specially-crafted DNS response may be able to trigger a buffer overflow and execute arbitrary code on a vulnerable phone. This vulnerability is corrected in SCCP firmware version 8.0(8) and SIP firmware version 8.8(0). This vulnerability is documented in CVE-2008-0530 leavingcisco.com and Cisco Bug IDs CSCsj74818 and CSCsk21863.

SCCP-Only Related Vulnerabilities

Large ICMP Echo Request DoS

Cisco Unified IP Phone 7940, 7940G, 7960 and 7960G devices running SCCP firmware contain a DoS vulnerability. It is possible to cause a vulnerable device to reboot by sending a large ICMP echo request packet. This vulnerability is corrected in SCCP firmware version 8.0(6). This vulnerability is documented in CVE-2008-0526 leavingcisco.com and Cisco Bug ID CSCsh71110.
HTTP Server DoS

Cisco Unified IP Phone 7935 and 7936 devices running SCCP firmware contain a DoS vulnerability in their internal HTTP server. By sending a specially crafted HTTP request to TCP port 80 on a vulnerable phone, it may be possible to cause the phone to reboot. It is possible to workaround this issue by disabling the internal HTTP server on vulnerable phones. The internal HTTP server only listens to TCP port 80. This vulnerability is corrected in SCCP firmware version 3.2(17) for 7935 devices and SCCP firmware version 3.3(15) for 7936 devices. This vulnerability is documented in CVE-2008-0527 leavingcisco.com and Cisco Bug ID CSCsk20026.
SSH Server DoS

Cisco Unified IP Phone 7906G, 7911G, 7941G, 7961G, 7970G and 7971G devices running SCCP firmware contain a buffer overflow vulnerability in their internal Secure Shell (SSH) server. By sending a specially crafted to packet to TCP port 22 on a vulnerable phone, it may be possible for an unauthenticated attacker to cause the phone to reboot. It may also be possible for an unauthenticated attacker to execute arbitrary code with system privileges. It is possible to workaround this issue by disabling the internal SSH server on vulnerable phones. The internal SSH server only listens to TCP port 22. This vulnerability is corrected in SCCP firmware version 8.2(2)SR2. This vulnerability is documented in CVE-2004-2486 leavingcisco.com and Cisco Bug ID CSCsh79629.

SIP-Only Related Vulnerabilities

SIP MIME Boundary Overflow

Cisco Unified IP Phone 7940, 7940G, 7960 and 7960G devices running SIP firmware contain a buffer overflow vulnerability in the handling of Multipurpose Internet Mail Extensions (MIME) encoded data. By sending a specially crafted SIP message to a vulnerable phone, it may be possible to trigger a buffer overflow and execute arbitrary code on the phone. This vulnerability is corrected in SIP firmware version 8.8(0). This vulnerability is documented in CVE-2008-0528 leavingcisco.com and Cisco Bug ID CSCsj74786.
Telnet Server Overflow

Cisco Unified IP Phone 7940, 7940G, 7960 and 7960G devices running SIP firmware contain a buffer overflow vulnerability in their internal telnet server. The telnet server is disabled by default and can be configured to allow either privileged or unprivileged user-level access. If the telnet server is enabled for privileged or unprivileged access, the phone password parameter must additionally be configured to permit telnet access. By entering a specially crafted command on a phone configured to permit unprivileged access, it may be possible for an unprivileged-level, authenticated user to trigger a buffer overflow and obtain privileged-level access to the phone. It is possible to workaround this issue by disabling the internal telnet server on vulnerable phones. This vulnerability is corrected in SIP firmware version 8.8(0). This vulnerability is documented in CVE-2008-0529 leavingcisco.com and Cisco Bug ID CSCsj78359.
SIP Proxy Response Overflow

Cisco Unified IP Phone 7940, 7940G, 7960 and 7960G devices running SIP firmware contain a heap overflow vulnerability in the handling of a challenge/response message from a SIP proxy. If an attacker controls the SIP proxy to which a vulnerable phone is registered, attempts to register, or the attacker can act as a man-in-the-middle, it may be possible to send a malicious challenge/response message to a phone and execute arbitrary code. This vulnerability is corrected in SIP firmware version 8.8(0). This vulnerability is documented in CVE-2008-0531 leavingcisco.com and Cisco Bug ID CSCsj74765.

Vulnerability Scoring Details

Cisco is providing scores for the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this Security Advisory is done in accordance with CVSS version 2.0.

Cisco will provide a base and temporal score. Customers can then compute environmental scores to assist in determining the impact of the vulnerability in individual networks.

CVSS is a standards based scoring method that conveys vulnerability severity and helps determine urgency and priority of response.

Cisco has provided an FAQ to answer additional questions regarding CVSS at:

http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html

Cisco has also provided a CVSS calculator to help compute the environmental impact for individual networks at:

http://intellishield.cisco.com/security/alertmanager/cvss

CSCsj74818 - DNS Response Parsing Stack Overflow

CVSS Base Score - 10.0 Access Vector - Network Access Complexity - Low Authentication - None Confidentiality Impact - Complete Integrity Impact - Complete Availability Impact - Complete

CVSS Temporal Score - 8.3 Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed

CSCsk21863 - DNS Response Parsing Stack Overflow

CVSS Base Score - 10.0 Access Vector - Network Access Complexity - Low Authentication - None Confidentiality Impact - Complete Integrity Impact - Complete Availability Impact - Complete

CVSS Temporal Score - 8.3 Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed

CSCsh71110 - 7940/7960 IP Phone ICMP Denial of Service

CVSS Base Score - 7.8 Access Vector - Network Access Complexity - Low Authentication - None Confidentiality Impact - None Integrity Impact - None Availability Impact - Complete

CVSS Temporal Score - 6.4 Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed

CSCsk20026 - IP Phone HTTP Vulnerability

CVSS Base Score - 7.8 Access Vector - Network Access Complexity - Low Authentication - None Confidentiality Impact - None Integrity Impact - None Availability Impact - Complete

CVSS Temporal Score - 6.4 Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed

CSCsh79629 - TNP Phone SSH Vulnerability

CVSS Base Score - 10.0 Access Vector - Network Access Complexity - Low Authentication - None Confidentiality Impact - Complete Integrity Impact - Complete Availability Impact - Complete

CVSS Temporal Score - 8.3 Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed

CSCsj74786 - SIP Mime Boundary Overflow

CVSS Base Score - 10.0 Access Vector - Network Access Complexity - Low Authentication - None Confidentiality Impact - Complete Integrity Impact - Complete Availability Impact - Complete

CVSS Temporal Score - 8.3 Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed

CSCsj78359 - SIP 40/60:Telnet access stack overflow

CVSS Base Score - 8.5 Access Vector - Network Access Complexity - Medium Authentication - Single Confidentiality Impact - Complete Integrity Impact - Complete Availability Impact - Complete

CVSS Temporal Score - 7 Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed

CSCsj74765 - SIP Proxy Response Overflow

CVSS Base Score - 7.3 Access Vector - Network Access Complexity - High Authentication - None Confidentiality Impact - Complete Integrity Impact - Complete Availability Impact - Complete

CVSS Temporal Score - 6.3 Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed

Impact

Successful exploitation of these vulnerabilities may cause vulnerable IP phone devices to reboot which will interrupt client voice services and, in some cases, allow the execution of arbitrary code.

Software Versions and Fixes

When considering software upgrades, also consult http://www.cisco.com/go/psirt and any subsequent advisories to determine exposure and a complete upgrade solution.

In all cases, customers should exercise caution to be certain the devices to be upgraded contain sufficient memory and that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, contact the Cisco Technical Assistance Center ("TAC") or your contracted maintenance provider for assistance.

Workarounds

Workarounds are available for several of the vulnerabilities. Disabling unnecessary internal phone Telnet and HTTP servers will eliminate exposure to the Telnet Server overflow and HTTP Server DoS vulnerabilities.

It is possible to mitigate these vulnerabilities with access control lists (ACL). Filters that deny ICMP Echo Request, TCP port 22 (SSH), TCP port 23 (Telnet), TCP port 80 (HTTP), TCP/UDP port 53 (DNS) and TCP/UDP port 5060 (SIP) should be deployed at voice/data network boundaries as part of a tACL policy for protection of traffic which enters the network at ingress access points. This policy should be configured to protect the network device and other devices behind it where the filter is applied.

Additional information about tACLs is available in "Transit Access Control Lists: Filtering at Your Edge":

http://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801afc76.shtml

Additional mitigation techniques that can be deployed on Cisco devices within the network are available in the Cisco Applied Mitigation Bulletin companion document for this advisory:

http://www.cisco.com/warp/public/707/cisco-amb-20080116-phone.shtml

Obtaining Fixed Software

Cisco will make free software available to address this vulnerability for affected customers. This advisory will be updated as fixed software becomes available. Prior to deploying software, customers should consult their maintenance provider or check the software for feature set compatibility and known issues specific to their environment.

Customers may only install and expect support for the feature sets they have purchased. By installing, downloading, accessing or otherwise using such software upgrades, customers agree to be bound by the terms of Cisco's software license terms found a http://www.cisco.com/public/sw-license-agreement.html , or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml.

Do not contact either "psirt@cisco.com" or "security-alert@cisco.com" for software upgrades.

Fixed Firmware for SCCP-Related Vulnerabilities

For the Large ICMP Echo DoS, fixed SCCP firmware version 8.0(6) and later for Cisco Unified IP Phone 7940, 7940G, 7960 and 7960G devices is available.

For the HTTP Server DoS, fixed SCCP firmware version 3.2(17) and later for Cisco Unified IP Phone 7935 devices and fixed SCCP firmware 3.3(15) and later for Cisco Unified IP Phone 7936 devices are available.

For the SSH Server DoS, fixed SCCP firmware version 8.2(2)SR2 and later for Cisco Unified IP Phone 7906G, 7911G, 7941G, 7961G, 7970G and 7971G devices is available.

For the DNS Response Parsing overflow, fixed SCCP firmware version 8.0(8) and later for Cisco Unified IP Phone 7940, 7940G, 7960 and 7960G devices is available.

Fixed firmware for all SCCP-related vulnerabilities can be obtained here:

http://www.cisco.com/pcgi-bin/tablebuild.pl/ip-7900ser?psrtdcat20e2

Fixed Firmware for SIP-Related Vulnerabilities

All the SIP-related vulnerabilities referenced in this advisory are fixed in SIP firmware version 8.0(6) and later for Cisco Unified IP Phone 7940, 7940G, 7960 and 7960G devices, which can be obtained here:

http://www.cisco.com/pcgi-bin/tablebuild.pl/sip-ip-phone7960?psrtdcat20e2

Customers with Service Contracts +-------------------------------

Customers with contracts should obtain upgraded software through their regular update channels. For most customers, this means that upgrades should be obtained through the Software Center on Cisco's worldwide website at http://www.cisco.com.

Customers using Third Party Support Organizations +------------------------------------------------

Customers whose Cisco products are provided or maintained through prior or existing agreement with third-party support organizations such as Cisco Partners, authorized resellers, or service providers should contact that support organization for guidance and assistance with the appropriate course of action in regards to this advisory.

The effectiveness of any workaround or fix is dependent on specific customer situations such as product mix, network topology, traffic behavior, and organizational mission. Due to the variety of affected products and releases, customers should consult with their service provider or support organization to ensure any applied workaround or fix is the most appropriate for use in the intended network before it is deployed.

Customers without Service Contracts +----------------------------------

Customers who purchase direct from Cisco but who do not hold a Cisco service contract and customers who purchase through third-party vendors but are unsuccessful at obtaining fixed software through their point of sale should get their upgrades by contacting the Cisco Technical Assistance Center (TAC). TAC contacts are as follows.

+1 800 553 2447 (toll free from within North America)
+1 408 526 7209 (toll call from anywhere in the world)
e-mail: tac@cisco.com

Have your product serial number available and give the URL of this notice as evidence of your entitlement to a free upgrade. Free upgrades for non-contract customers must be requested through the TAC.

Refer to http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml for additional TAC contact information, including special localized telephone numbers and instructions and e-mail addresses for use in various languages.

Exploitation and Public Announcements

The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities described in this advisory.

The SIP MIME Boundary, Telnet Server, DNS Response Parsing and SIP Proxy Response overflows were reported to Cisco by Jon Griffin and Mustaque Ahamad of the School of Computer Science at the Georgia Institute of Technology.

The HTTP Server DoS was reported to Cisco by Sven Weizenegger of T-Systems.

The Large ICMP Echo Request DoS vulnerability was reported to Cisco by a customer. The SSH Server DoS was discovered internally by Cisco.

Status of this Notice: FINAL

THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.

A stand-alone copy or Paraphrase of the text of this document that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors.

Distribution

This advisory is posted on Cisco's worldwide website at:

http://www.cisco.com/warp/public/707/cisco-sa-20080213-phone.shtml

In addition to worldwide web posting, a text version of this notice is clear-signed with the Cisco PSIRT PGP key and is posted to the following e-mail and Usenet news recipients.

cust-security-announce@cisco.com
first-teams@first.org
bugtraq@securityfocus.com
vulnwatch@vulnwatch.org
cisco@spot.colorado.edu
cisco-nsp@puck.nether.net
full-disclosure@lists.grok.org.uk
comp.dcom.sys.cisco@newsgate.cisco.com

Future updates of this advisory, if any, will be placed on Cisco's worldwide website, but may or may not be actively announced on mailing lists or newsgroups. Users concerned about this problem are encouraged to check the above URL for any updates.

Revision History

Cisco Security Procedures

Complete information on reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco, is available on Cisco's worldwide website at:

http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html

This includes instructions for press inquiries regarding Cisco security notices. All Cisco security advisories are available at:

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    "data": "The DSS verification code in Dropbear SSH Server before 0.43 frees uninitialized variables, which might allow remote attackers to gain access. Dropbear SSH is affected by an unspecified Digital Signal Standard (DSS) authentication vulnerability. \nThe impact of this issue is currently unknown. Presumably, an attacker could use this issue to gain unauthorized access to a computer running the vulnerable application, but this is not confirmed. We will update this BID as more information emerges. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA1\n\nCisco Security Advisory: Cisco Unified IP Phone Overflow and Denial\n                         of Service Vulnerabilities\n\nRevision 1.0\n\nFor Public Release 2008 February 13 1600 UTC (GMT)\n\n+--------------------------------------------------------------------\n\nSummary\n=======\n\nCisco Unified IP Phone models contain multiple overflow and denial of\nservice (DoS) vulnerabilities. There are workarounds for several of\nthese vulnerabilities. Cisco has made free software available to\naddress this issue for affected customers. \n\nThis advisory is posted at:\n\nhttp://www.cisco.com/warp/public/707/cisco-sa-20080213-phone.shtml\n\nAffected Products\n=================\n\nVulnerable Products\n+------------------\n\nThe following Cisco Unified IP Phone devices running Skinny Client\nControl Protocol (SCCP) firmware:\n\n  * 7906G\n  * 7911G\n  * 7935\n  * 7936\n  * 7940\n  * 7940G\n  * 7941G\n  * 7960\n  * 7960G\n  * 7961G\n  * 7970G\n  * 7971G\n\nThe following Cisco Unified IP Phone devices running Session\nInitiation Protocol (SIP) firmware:\n\n  * 7940\n  * 7940G\n  * 7960\n  * 7960G\n\nThe version of firmware running on an IP Phone can be determined via\nthe Settings menu on the phone or via the phone HTTP interface. \n\nProducts Confirmed Not Vulnerable\n+--------------------------------\n\nNo other Cisco products are known to be vulnerable. This includes the\nfollowing Cisco Unified IP Phone devices:\n\n  * 7931\n  * 7937\n  * 7942\n  * 7945\n  * 7965\n  * 7975\n\nDetails\n=======\n\nSCCP and SIP-Related Vulnerabilities\n\n  * DNS Response Parsing Overflow\n\n    Cisco Unified IP Phone 7940, 7940G, 7960 and 7960G devices\n    running SCCP and SIP firmware contain a buffer overflow\n    vulnerability in the handling of DNS responses. A\n    specially-crafted DNS response may be able to trigger a buffer\n    overflow and execute arbitrary code on a vulnerable phone. This\n    vulnerability is corrected in SCCP firmware version 8.0(8) and\n    SIP firmware version 8.8(0). This vulnerability is documented in \n    CVE-2008-0530 leavingcisco.com and Cisco Bug IDs CSCsj74818 and\n    CSCsk21863. \n\nSCCP-Only Related Vulnerabilities\n\n  * Large ICMP Echo Request DoS\n\n    Cisco Unified IP Phone 7940, 7940G, 7960 and 7960G devices\n    running SCCP firmware contain a DoS vulnerability. It is possible\n    to cause a vulnerable device to reboot by sending a large ICMP\n    echo request packet. This vulnerability is corrected in SCCP\n    firmware version 8.0(6). This vulnerability is documented in \n    CVE-2008-0526 leavingcisco.com and Cisco Bug ID CSCsh71110. \n\n  * HTTP Server DoS\n\n    Cisco Unified IP Phone 7935 and 7936 devices running SCCP\n    firmware contain a DoS vulnerability in their internal HTTP\n    server. By sending a specially crafted HTTP request to TCP port\n    80 on a vulnerable phone, it may be possible to cause the phone\n    to reboot. It is possible to workaround this issue by disabling\n    the internal HTTP server on vulnerable phones. The internal HTTP\n    server only listens to TCP port 80. This vulnerability is\n    corrected in SCCP firmware version 3.2(17) for 7935 devices and\n    SCCP firmware version 3.3(15) for 7936 devices. This\n    vulnerability is documented in CVE-2008-0527 leavingcisco.com and\n    Cisco Bug ID CSCsk20026. \n\n  * SSH Server DoS\n\n    Cisco Unified IP Phone 7906G, 7911G, 7941G, 7961G, 7970G and\n    7971G devices running SCCP firmware contain a buffer overflow\n    vulnerability in their internal Secure Shell (SSH) server. By\n    sending a specially crafted to packet to TCP port 22 on a\n    vulnerable phone, it may be possible for an unauthenticated\n    attacker to cause the phone to reboot. It may also be possible\n    for an unauthenticated attacker to execute arbitrary code with\n    system privileges. It is possible to workaround this issue by\n    disabling the internal SSH server on vulnerable phones. The\n    internal SSH server only listens to TCP port 22. This\n    vulnerability is corrected in SCCP firmware version 8.2(2)SR2. \n    This vulnerability is documented in CVE-2004-2486 \n    leavingcisco.com and Cisco Bug ID CSCsh79629. \n\nSIP-Only Related Vulnerabilities\n\n  * SIP MIME Boundary Overflow\n\n    Cisco Unified IP Phone 7940, 7940G, 7960 and 7960G devices\n    running SIP firmware contain a buffer overflow vulnerability in\n    the handling of Multipurpose Internet Mail Extensions (MIME)\n    encoded data. By sending a specially crafted SIP message to a\n    vulnerable phone, it may be possible to trigger a buffer overflow\n    and execute arbitrary code on the phone. This vulnerability is\n    corrected in SIP firmware version 8.8(0). This vulnerability is\n    documented in CVE-2008-0528 leavingcisco.com and Cisco Bug ID\n    CSCsj74786. \n\n  * Telnet Server Overflow\n\n    Cisco Unified IP Phone 7940, 7940G, 7960 and 7960G devices\n    running SIP firmware contain a buffer overflow vulnerability in\n    their internal telnet server. The telnet server is disabled by\n    default and can be configured to allow either privileged or\n    unprivileged user-level access. If the telnet server is enabled\n    for privileged or unprivileged access, the phone password\n    parameter must additionally be configured to permit telnet\n    access. By entering a specially crafted command on a phone\n    configured to permit unprivileged access, it may be possible for\n    an unprivileged-level, authenticated user to trigger a buffer\n    overflow and obtain privileged-level access to the phone. It is\n    possible to workaround this issue by disabling the internal\n    telnet server on vulnerable phones. This vulnerability is\n    corrected in SIP firmware version 8.8(0). This vulnerability is\n    documented in CVE-2008-0529 leavingcisco.com and Cisco Bug ID\n    CSCsj78359. \n\n  * SIP Proxy Response Overflow\n\n    Cisco Unified IP Phone 7940, 7940G, 7960 and 7960G devices\n    running SIP firmware contain a heap overflow vulnerability in the\n    handling of a challenge/response message from a SIP proxy. If an\n    attacker controls the SIP proxy to which a vulnerable phone is\n    registered, attempts to register, or the attacker can act as a\n    man-in-the-middle, it may be possible to send a malicious\n    challenge/response message to a phone and execute arbitrary code. \n    This vulnerability is corrected in SIP firmware version 8.8(0). \n    This vulnerability is documented in CVE-2008-0531 \n    leavingcisco.com and Cisco Bug ID CSCsj74765. \n\nVulnerability Scoring Details\n=============================\n\nCisco is providing scores for the vulnerabilities in this advisory\nbased on the Common Vulnerability Scoring System (CVSS). The CVSS\nscoring in this Security Advisory is done in accordance with CVSS\nversion 2.0. \n\nCisco will provide a base and temporal score. Customers can then\ncompute environmental scores to assist in determining the impact of\nthe vulnerability in individual networks. \n\nCVSS is a standards based scoring method that conveys vulnerability\nseverity and helps determine urgency and priority of response. \n\nCisco has provided an FAQ to answer additional questions regarding\nCVSS at:\n\nhttp://www.cisco.com/web/about/security/intelligence/cvss-qandas.html\n\nCisco has also provided a CVSS calculator to help compute the\nenvironmental impact for individual networks at:\n\nhttp://intellishield.cisco.com/security/alertmanager/cvss\n\nCSCsj74818 - DNS Response Parsing Stack Overflow\n\nCVSS Base Score - 10.0\n    Access Vector -            Network\n    Access Complexity -        Low\n    Authentication -           None\n    Confidentiality Impact -   Complete\n    Integrity Impact -         Complete\n    Availability Impact -      Complete\n\nCVSS Temporal Score - 8.3\n    Exploitability -           Functional\n    Remediation Level -        Official-Fix\n    Report Confidence -        Confirmed\n    \nCSCsk21863 - DNS Response Parsing Stack Overflow\n\nCVSS Base Score - 10.0\n    Access Vector -            Network\n    Access Complexity -        Low\n    Authentication -           None\n    Confidentiality Impact -   Complete\n    Integrity Impact -         Complete\n    Availability Impact -      Complete\n\nCVSS Temporal Score - 8.3\n    Exploitability -           Functional\n    Remediation Level -        Official-Fix\n    Report Confidence -        Confirmed\n\nCSCsh71110 - 7940/7960 IP Phone ICMP Denial of Service\n\nCVSS Base Score - 7.8\n    Access Vector -            Network\n    Access Complexity -        Low\n    Authentication -           None\n    Confidentiality Impact -   None\n    Integrity Impact -         None\n    Availability Impact -      Complete\n\nCVSS Temporal Score - 6.4\n    Exploitability -           Functional\n    Remediation Level -        Official-Fix\n    Report Confidence -        Confirmed\n\nCSCsk20026 - IP Phone HTTP Vulnerability\n\nCVSS Base Score - 7.8\n    Access Vector -            Network\n    Access Complexity -        Low\n    Authentication -           None\n    Confidentiality Impact -   None\n    Integrity Impact -         None\n    Availability Impact -      Complete\n\nCVSS Temporal Score - 6.4\n    Exploitability -           Functional\n    Remediation Level -        Official-Fix\n    Report Confidence -        Confirmed\n\nCSCsh79629 - TNP Phone SSH Vulnerability\n\nCVSS Base Score - 10.0\n    Access Vector -            Network\n    Access Complexity -        Low\n    Authentication -           None\n    Confidentiality Impact -   Complete\n    Integrity Impact -         Complete\n    Availability Impact -      Complete\n\nCVSS Temporal Score - 8.3\n    Exploitability -           Functional\n    Remediation Level -        Official-Fix\n    Report Confidence -        Confirmed\n\nCSCsj74786 - SIP Mime Boundary Overflow\n\nCVSS Base Score - 10.0\n    Access Vector -            Network\n    Access Complexity -        Low\n    Authentication -           None\n    Confidentiality Impact -   Complete\n    Integrity Impact -         Complete\n    Availability Impact -      Complete\n\nCVSS Temporal Score - 8.3\n    Exploitability -           Functional\n    Remediation Level -        Official-Fix\n    Report Confidence -        Confirmed\n\nCSCsj78359 - SIP 40/60:Telnet access stack overflow\n\nCVSS Base Score - 8.5\n    Access Vector -            Network\n    Access Complexity -        Medium\n    Authentication -           Single\n    Confidentiality Impact -   Complete\n    Integrity Impact -         Complete\n    Availability Impact -      Complete\n\nCVSS Temporal Score - 7\n    Exploitability -           Functional\n    Remediation Level -        Official-Fix\n    Report Confidence -        Confirmed\n\nCSCsj74765 - SIP Proxy Response Overflow\n\nCVSS Base Score - 7.3\n    Access Vector -            Network\n    Access Complexity -        High\n    Authentication -           None\n    Confidentiality Impact -   Complete\n    Integrity Impact -         Complete\n    Availability Impact -      Complete\n\nCVSS Temporal Score - 6.3\n    Exploitability -           Functional\n    Remediation Level -        Official-Fix\n    Report Confidence -        Confirmed\n\nImpact\n======\n\nSuccessful exploitation of these vulnerabilities may cause vulnerable\nIP phone devices to reboot which will interrupt client voice services\nand, in some cases, allow the execution of arbitrary code. \n\nSoftware Versions and Fixes\n===========================\n\nWhen considering software upgrades, also consult\nhttp://www.cisco.com/go/psirt and any subsequent advisories to\ndetermine exposure and a complete upgrade solution. \n\nIn all cases, customers should exercise caution to be certain the\ndevices to be upgraded contain sufficient memory and that current\nhardware and software configurations will continue to be supported\nproperly by the new release. If the information is not clear, contact\nthe Cisco Technical Assistance Center (\"TAC\") or your contracted\nmaintenance provider for assistance. \n\nWorkarounds\n===========\n\nWorkarounds are available for several of the vulnerabilities. \nDisabling unnecessary internal phone Telnet and HTTP servers will\neliminate exposure to the Telnet Server overflow and HTTP Server DoS\nvulnerabilities. \n\nIt is possible to mitigate these vulnerabilities with access control\nlists (ACL). Filters that deny ICMP Echo Request, TCP port 22 (SSH),\nTCP port 23 (Telnet), TCP port 80 (HTTP), TCP/UDP port 53 (DNS) and\nTCP/UDP port 5060 (SIP) should be deployed at voice/data network\nboundaries as part of a tACL policy for protection of traffic which\nenters the network at ingress access points. This policy should be\nconfigured to protect the network device and other devices behind it\nwhere the filter is applied. \n\nAdditional information about tACLs is available in \"Transit Access\nControl Lists: Filtering at Your Edge\":\n\nhttp://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801afc76.shtml\n\nAdditional mitigation techniques that can be deployed on Cisco\ndevices within the network are available in the Cisco Applied\nMitigation Bulletin companion document for this advisory:\n\nhttp://www.cisco.com/warp/public/707/cisco-amb-20080116-phone.shtml\n\nObtaining Fixed Software\n========================\n\nCisco will make free software available to address this vulnerability\nfor affected customers. This advisory will be updated as fixed\nsoftware becomes available. Prior to deploying software, customers\nshould consult their maintenance provider or check the software for\nfeature set compatibility and known issues specific to their\nenvironment. \n\nCustomers may only install and expect support for the feature sets\nthey have purchased. By installing, downloading, accessing or\notherwise using such software upgrades, customers agree to be bound\nby the terms of Cisco\u0027s software license terms found a\nhttp://www.cisco.com/public/sw-license-agreement.html , or as otherwise\nset forth at Cisco.com Downloads at\nhttp://www.cisco.com/public/sw-center/sw-usingswc.shtml. \n\nDo not contact either \"psirt@cisco.com\" or \"security-alert@cisco.com\"\nfor software upgrades. \n\nFixed Firmware for SCCP-Related Vulnerabilities\n\nFor the Large ICMP Echo DoS, fixed SCCP firmware version 8.0(6) and\nlater for Cisco Unified IP Phone 7940, 7940G, 7960 and 7960G devices\nis available. \n\nFor the HTTP Server DoS, fixed SCCP firmware version 3.2(17) and\nlater for Cisco Unified IP Phone 7935 devices and fixed SCCP firmware\n3.3(15) and later for Cisco Unified IP Phone 7936 devices are\navailable. \n\nFor the SSH Server DoS, fixed SCCP firmware version 8.2(2)SR2 and\nlater for Cisco Unified IP Phone 7906G, 7911G, 7941G, 7961G, 7970G\nand 7971G devices is available. \n\nFor the DNS Response Parsing overflow, fixed SCCP firmware version\n8.0(8) and later for Cisco Unified IP Phone 7940, 7940G, 7960 and\n7960G devices is available. \n\nFixed firmware for all SCCP-related vulnerabilities can be obtained\nhere:\n\nhttp://www.cisco.com/pcgi-bin/tablebuild.pl/ip-7900ser?psrtdcat20e2\n\nFixed Firmware for SIP-Related Vulnerabilities\n\nAll the SIP-related vulnerabilities referenced in this advisory are\nfixed in SIP firmware version 8.0(6) and later for Cisco Unified IP\nPhone 7940, 7940G, 7960 and 7960G devices, which can be obtained\nhere:\n\nhttp://www.cisco.com/pcgi-bin/tablebuild.pl/sip-ip-phone7960?psrtdcat20e2\n\nCustomers with Service Contracts\n+-------------------------------\n\nCustomers with contracts should obtain upgraded software through\ntheir regular update channels. For most customers, this means that\nupgrades should be obtained through the Software Center on Cisco\u0027s\nworldwide website at http://www.cisco.com. \n\nCustomers using Third Party Support Organizations\n+------------------------------------------------\n\nCustomers whose Cisco products are provided or maintained through\nprior or existing agreement with third-party support organizations\nsuch as Cisco Partners, authorized resellers, or service providers\nshould contact that support organization for guidance and assistance\nwith the appropriate course of action in regards to this advisory. \n\nThe effectiveness of any workaround or fix is dependent on specific\ncustomer situations such as product mix, network topology, traffic\nbehavior, and organizational mission. Due to the variety of affected\nproducts and releases, customers should consult with their service\nprovider or support organization to ensure any applied workaround or\nfix is the most appropriate for use in the intended network before it\nis deployed. \n\nCustomers without Service Contracts\n+----------------------------------\n\nCustomers who purchase direct from Cisco but who do not hold a Cisco\nservice contract and customers who purchase through third-party\nvendors but are unsuccessful at obtaining fixed software through\ntheir point of sale should get their upgrades by contacting the Cisco\nTechnical Assistance Center (TAC). TAC contacts are as follows. \n\n  * +1 800 553 2447 (toll free from within North America)\n  * +1 408 526 7209 (toll call from anywhere in the world)\n  * e-mail: tac@cisco.com\n\nHave your product serial number available and give the URL of this\nnotice as evidence of your entitlement to a free upgrade. Free\nupgrades for non-contract customers must be requested through the\nTAC. \n\nRefer to http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml\nfor additional TAC contact information, including special localized\ntelephone numbers and instructions and e-mail addresses for use in\nvarious languages. \n\nExploitation and Public Announcements\n=====================================\n\nThe Cisco PSIRT is not aware of any public announcements or malicious\nuse of the vulnerabilities described in this advisory. \n\nThe SIP MIME Boundary, Telnet Server, DNS Response Parsing and SIP\nProxy Response overflows were reported to Cisco by Jon Griffin and\nMustaque Ahamad of the School of Computer Science at the Georgia\nInstitute of Technology. \n\nThe HTTP Server DoS was reported to Cisco by Sven Weizenegger of\nT-Systems. \n\nThe Large ICMP Echo Request DoS vulnerability was reported to Cisco\nby a customer. The SSH Server DoS was discovered internally by Cisco. \n\nStatus of this Notice: FINAL\n============================\n\nTHIS DOCUMENT IS PROVIDED ON AN \"AS IS\" BASIS AND DOES NOT IMPLY ANY\nKIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF\nMERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE\nINFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS\nAT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS\nDOCUMENT AT ANY TIME. \n\nA stand-alone copy or Paraphrase of the text of this document that\nomits the distribution URL in the following section is an\nuncontrolled copy, and may lack important information or contain\nfactual errors. \n\nDistribution\n============\n\nThis advisory is posted on Cisco\u0027s worldwide website at:\n\nhttp://www.cisco.com/warp/public/707/cisco-sa-20080213-phone.shtml\n\nIn addition to worldwide web posting, a text version of this notice\nis clear-signed with the Cisco PSIRT PGP key and is posted to the\nfollowing e-mail and Usenet news recipients. \n\n  * cust-security-announce@cisco.com\n  * first-teams@first.org\n  * bugtraq@securityfocus.com\n  * vulnwatch@vulnwatch.org\n  * cisco@spot.colorado.edu\n  * cisco-nsp@puck.nether.net\n  * full-disclosure@lists.grok.org.uk\n  * comp.dcom.sys.cisco@newsgate.cisco.com\n\nFuture updates of this advisory, if any, will be placed on Cisco\u0027s\nworldwide website, but may or may not be actively announced on\nmailing lists or newsgroups. Users concerned about this problem are\nencouraged to check the above URL for any updates. \n\nRevision History\n================\n\n+----------------------------------------+\n| Revision |                  | Initial  |\n| 1.0      | 2008-February-13 | public   |\n|          |                  | release. |\n+----------------------------------------+\n\nCisco Security Procedures\n=========================\n\nComplete information on reporting security vulnerabilities in Cisco\nproducts, obtaining assistance with security incidents, and\nregistering to receive security information from Cisco, is available\non Cisco\u0027s worldwide website at:\n\nhttp://www.cisco.com/en/US/products/products_security_vulnerability_policy.html\n\nThis includes instructions for press inquiries regarding Cisco\nsecurity notices.  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cve-2004-2486

Vulnerability from cvelistv5

Published

2005-10-25 04:00

Modified

2024-08-08 01:29

Severity ?

Summary

The DSS verification code in Dropbear SSH Server before 0.43 frees uninitialized variables, which might allow remote attackers to gain access.

References

▼	URL	Tags
	https://exchange.xforce.ibmcloud.com/vulnerabilities/40490	vdb-entry, x_refsource_XF
	http://www.cisco.com/en/US/products/products_security_advisory09186a0080949c7a.shtml	vendor-advisory, x_refsource_CISCO
	http://www.osvdb.org/8137	vdb-entry, x_refsource_OSVDB
	http://secunia.com/advisories/12153	third-party-advisory, x_refsource_SECUNIA
	http://matt.ucc.asn.au/dropbear/CHANGES	x_refsource_CONFIRM
	http://www.vupen.com/english/advisories/2008/0543	vdb-entry, x_refsource_VUPEN
	https://exchange.xforce.ibmcloud.com/vulnerabilities/16810	vdb-entry, x_refsource_XF
	http://secunia.com/advisories/28935	third-party-advisory, x_refsource_SECUNIA
	http://www.securityfocus.com/bid/10803	vdb-entry, x_refsource_BID

Impacted products

	Vendor	Product	Version
	n/a	n/a	Version: n/a

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

Action not permitted

var-200412-0263

Vulnerability from variot

Summary

Affected Products

Details

Vulnerability Scoring Details

Impact

Software Versions and Fixes

Workarounds

Obtaining Fixed Software

Exploitation and Public Announcements

Status of this Notice: FINAL

Distribution

Revision History

Cisco Security Procedures

cve-2004-2486

Vulnerability from cvelistv5

Tags

Sightings

Nomenclature