var-200810-0196
Vulnerability from variot

Unspecified vulnerability in Cisco Adaptive Security Appliances (ASA) 5500 Series and PIX Security Appliances 7.0 before 7.0(8)3, 7.1 before 7.1(2)78, 7.2 before 7.2(4)16, 8.0 before 8.0(4)6, and 8.1 before 8.1(1)13, when configured as a VPN using Microsoft Windows NT Domain authentication, allows remote attackers to bypass VPN authentication via unknown vectors. Cisco PIX and ASA is prone to an authentication-bypass vulnerability. Remote attackers can exploit this issue to gain unauthorized access to the affected devices. Successfully exploiting this issue will lead to other attacks. This issue is being monitored by Cisco Bug ID CSCsj25896. PIX is a firewall device that provides policy enforcement, multi-vector attack protection and secure connection services for users and applications; Adaptive Security Appliance (ASA) is a modular platform that provides security and VPN services.

SOLUTION: Update to fixed versions (please see the vendor's advisory for details).

PROVIDED AND/OR DISCOVERED BY: Reported by the vendor.

ORIGINAL ADVISORY: Cisco: http://www.cisco.com/warp/public/707/cisco-sa-20081022-asa.shtml

About: This Advisory was delivered by Secunia as a free service to help everybody keeping their systems up to date against the latest vulnerabilities.

Subscribe: http://secunia.com/advisories/secunia_security_advisories/

Definitions: (Criticality, Where etc.) http://secunia.com/advisories/about_secunia_advisories/

Please Note: Secunia recommends that you verify all advisories you receive by clicking the link. Secunia NEVER sends attached files with advisories. Secunia does not advise people to install third party patches, only use those supplied by the vendor. This security advisory outlines details of these vulnerabilities:

  • Windows NT Domain Authentication Bypass Vulnerability
  • IPv6 Denial of Service Vulnerability
  • Crypto Accelerator Memory Leak Vulnerability

Note: These vulnerabilities are independent of each other. A device may be affected by one vulnerability and not affected by another.

Cisco has released free software updates that address these vulnerabilities. Workarounds that mitigate some of these vulnerabilities are available.

This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20081022-asa.shtml.

Affected Products

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

The following are the details about each vulnerability described within this advisory. Devices that are using any other type of external authentication (that is, LDAP, RADIUS, TACACS+, SDI, or local database) are not affected by this vulnerability.

The following example demonstrates how Windows NT domain authentication is configured using the command line interface (CLI) on the Cisco ASA:

aaa-server NTAuth protocol nt
 aaa-server NTAuth (inside) host 10.1.1.4
 nt-auth-domain-controller primary1

Alternatively, to see if a device is configured for Windows NT Domain authentication use the "show running-config | include nt-auth-domain-controller" command. This vulnerability does not affect devices configured only for IPv4.

Note: IPv6 functionality is turned off by default.

IPv6 is enabled on the Cisco ASA and Cisco PIX security appliance using the "ipv6 address" interface command. To verify if a device is configured for IPv6 use the "show running-config | include ipv6" command.

Alternatively, you can display the status of interfaces configured for IPv6 using the show ipv6 interface command in privileged EXEC mode, as shown in the following example:

hostname# show ipv6 interface brief
outside [up/up]
    unassigned
inside [up/up]
    fe80::20d:29ff:fe1d:69f0
    fec0::a:0:0:a0a:a70
dmz [up/up]
    unassigned

In this example, the "outside" and "dmz" interfaces are not configured for IPv6.

Crypto Accelerator Memory Leak Vulnerability +-------------------------------------------

Cisco ASA security appliances may experience a memory leak that can be triggered by a series of crafted packets. This memory leak occurs in the initialization code for the hardware crypto accelerator. Devices that are running software versions in the 8.0.x release are vulnerable.

Note: Cisco ASA appliances that are running software versions in the 7.0, 7.1, and 7.2 releases are not vulnerable.

Determination of Software Versions +---------------------------------

The "show version" command-line interface (CLI) command can be used to determine whether a vulnerable version of the Cisco PIX or Cisco ASA software is running. The following example shows a Cisco ASA Security Appliance that runs software release 8.0(4):

    ASA# show version

    Cisco Adaptive Security Appliance Software Version 8.0(4)
    Device Manager Version 6.0(1)

    [...]

Customers who use the Cisco Adaptive Security Device Manager (ASDM) to manage their devices can find the version of the software displayed in the table in the login window or in the upper left corner of the ASDM window.

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

The Cisco Firewall Services Module (FWSM) is not affected by any of these vulnerabilities. Cisco PIX security appliances running versions 6.x are not vulnerable. No other Cisco products are currently known to be affected by these vulnerabilities.

Details

This Security Advisory describes multiple distinct vulnerabilities. These vulnerabilities are independent of each other. NT Domain authentication is supported only for remote access VPNs. Devices that are running software version 7.2(4)9 or 7.2(4)10 and configured for IPv6 may be vulnerable. This vulnerability does not affect devices that are configured only for IPv4.

Note: Devices that are running software versions in the 7.0, 7.1, 8.0, and 8.1 releases are not vulnerable.

To configure IPv6 on a Cisco ASA or Cisco PIX security appliance, at a minimum, each interface needs to be configured with an IPv6 link-local address. Additionally, you can add a global address to the interface.

Note: Only packets that are destined to the device (not transiting the device) may trigger the effects of this vulnerability. These packets must be destined to an interface configured for IPv6.

Crypto Accelerator Memory Leak Vulnerability +-------------------------------------------

The Cisco ASA security appliances may experience a memory leak triggered by a series of packets. This memory leak occurs in the initialization code for the hardware crypto accelerator.

Note: Only packets destined to the device (not transiting the device) may trigger this vulnerability.

The following Cisco ASA features use the services the crypto accelerator provides, and therefore may be affected by this vulnerability:

  • Clientless WebVPN, SSL VPN Client, and AnyConnect Connections
  • ASDM (HTTPS) Management Sessions
  • Cut-Through Proxy for Network Access
  • TLS Proxy for Encrypted Voice Inspection
  • IP Security (IPsec) Remote Access and Site-to-site VPNs
  • Secure Shell (SSH) Access

This vulnerability is documented in Cisco Bug ID CSCsj25896 and has been assigned the Common Vulnerabilities and Exposures (CVE) identifier CVE-2008-3817.

Vulnerability Scoring Details +----------------------------

Cisco has provided 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.

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

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

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

  • Windows NT Domain Authentication Bypass Vulnerability (CSCsu65735)

CVSS Base Score - 4.3 Access Vector - Network Access Complexity - Medium Authentication - None Confidentiality Impact - Partial Integrity Impact - None Availability Impact - None

CVSS Temporal Score - 3.7 Exploitability - High Remediation Level - Official-Fix Report Confidence - Confirmed

  • Cisco ASA may reload after receiving certain IPv6 packets (CSCsu11575)

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

  • Crypto Accelerator Memory Leak (CSCsj25896)

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

Impact

Successful exploitation of the VPN Authentication Bypass Vulnerability may allow an attacker to successfully connect to the Cisco ASA via remote access IPSec or SSL-based VPN. The Denial of Service (DoS) vulnerabilities may cause a reload of the affected device. Repeated exploitation could result in a sustained DoS condition.

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.

The following list contains the first fixed software release of each vulnerability:

+----------------------------------------+ | | Affected | First | | Vulnerability | Release | Fixed | | | | Version | |----------------+----------+------------| | | 7.0 | 7.0(8)3 | | |----------+------------| | Windows NT | 7.1 | 7.1(2)78 | |Domain |----------+------------| | Authentication | 7.2 | 7.2(4)16 | |Bypass |----------+------------| | Vulnerability | 8.0 | 8.0(4)6 | | |----------+------------| | | 8.1 | 8.1(1)13 | |----------------+----------+------------| | | 7.0 | Not | | | | Vulnerable | | |----------+------------| | | 7.1 | Not | | | | Vulnerable | |IPv6 Denial of |----------+------------| | Service | 7.2 | 7.2(4)11 | |Vulnerability |----------+------------| | | 8.0 | Not | | | | Vulnerable | | |----------+------------| | | 8.1 | Not | | | | Vulnerable | |----------------+----------+------------| | | 7.0 | Not | | | | Vulnerable | | |----------+------------| | | 7.1 | Not | | Crypto | | Vulnerable | |Accelerator |----------+------------| | Memory Leak | 7.2 | Not | | Vulnerability | | Vulnerable | | |----------+------------| | | 8.0 | 8.0(4) | | |----------+------------| | | 8.1 | 8.1(2) | +----------------------------------------+

The following maintenance software releases are the first software releases that contain the fixes for the vulnerabilities mentioned in this Security Advisory:

Fixed PIX software can be downloaded from:

http://www.cisco.com/pcgi-bin/tablebuild.pl/pix?psrtdcat20e2

Fix ASA software can be downloaded from:

http://www.cisco.com/pcgi-bin/tablebuild.pl/asa?psrtdcat20e2

For the "Windows NT Domain Authentication Bypass Vulnerability", only interim fixed software is currently available. Customers wishing to upgrade to a fixed version instead of applying a workaround may download PIX and ASA interim versions from:

http://www.cisco.com/pcgi-bin/tablebuild.pl/PIXPSIRT?psrtdcat20e2

Workarounds

This Security Advisory describes multiple distinct vulnerabilities. These vulnerabilities and their respective workarounds are independent of each other.

Windows NT Domain Authentication Bypass Vulnerability +----------------------------------------------------

LDAP authentication is not affected by this vulnerability.

Note: For more information about support for a specific AAA server type, refer to the following link: http://www.cisco.com/en/US/docs/security/asa/asa80/configuration/guide/aaa.html#wp1069492

IPv6 Denial of Service Vulnerability +-----------------------------------

Customers that do not require IPv6 functionality on their devices can use the "no ipv6 address" interface sub-command to disable processing of IPv6 packets and eliminate their exposure

Crypto Accelerator Memory Leak Vulnerability +-------------------------------------------

There are no workarounds for this vulnerability.

Obtaining Fixed Software

Cisco has released free software updates that address these vulnerabilities. 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 at http://www.cisco.com/en/US/products/prod_warranties_item09186a008088e31f.html, or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml.

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

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 agreements 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 do not hold a Cisco service contract, and customers who purchase through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should acquire 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

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

Refer to http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html for additional TAC contact information, including 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.

These vulnerabilities were found during internal testing and during the resolution of a technical support service request.

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-20081022-asa.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-bulletins@lists.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

+------------------------------------------------------------+ | Revision 1.0 | 2008-October-22 | Initial public release | +------------------------------------------------------------+

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 http://www.cisco.com/go/psirt.

+-------------------------------------------------------------------- Copyright 2007-2008 Cisco Systems, Inc. All rights reserved. +--------------------------------------------------------------------

Updated: Oct 22, 2008 Document ID: 108009

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    "data": "Unspecified vulnerability in Cisco Adaptive Security Appliances (ASA) 5500 Series and PIX Security Appliances 7.0 before 7.0(8)3, 7.1 before 7.1(2)78, 7.2 before 7.2(4)16, 8.0 before 8.0(4)6, and 8.1 before 8.1(1)13, when configured as a VPN using Microsoft Windows NT Domain authentication, allows remote attackers to bypass VPN authentication via unknown vectors. Cisco PIX and ASA is prone to an authentication-bypass vulnerability. \nRemote attackers can exploit this issue to gain unauthorized access to the affected devices. Successfully exploiting this issue will lead to other attacks. \nThis issue is being monitored by Cisco Bug ID CSCsj25896. PIX is a firewall device that provides policy enforcement, multi-vector attack protection and secure connection services for users and applications; Adaptive Security Appliance (ASA) is a modular platform that provides security and VPN services. \n\nSOLUTION:\nUpdate to fixed versions (please see the vendor\u0027s advisory for\ndetails). \n\nPROVIDED AND/OR DISCOVERED BY:\nReported by the vendor. \n\nORIGINAL ADVISORY:\nCisco:\nhttp://www.cisco.com/warp/public/707/cisco-sa-20081022-asa.shtml\n\n----------------------------------------------------------------------\n\nAbout:\nThis Advisory was delivered by Secunia as a free service to help\neverybody keeping their systems up to date against the latest\nvulnerabilities. \n\nSubscribe:\nhttp://secunia.com/advisories/secunia_security_advisories/\n\nDefinitions: (Criticality, Where etc.)\nhttp://secunia.com/advisories/about_secunia_advisories/\n\n\nPlease Note:\nSecunia recommends that you verify all advisories you receive by\nclicking the link. \nSecunia NEVER sends attached files with advisories. \nSecunia does not advise people to install third party patches, only\nuse those supplied by the vendor. This security\nadvisory outlines details of these vulnerabilities:\n\n  * Windows NT Domain Authentication Bypass Vulnerability\n  * IPv6 Denial of Service Vulnerability\n  * Crypto Accelerator Memory Leak Vulnerability\n\nNote: These vulnerabilities are independent of each other. A device may\nbe affected by one vulnerability and not affected by another. \n\nCisco has released free software updates that address these\nvulnerabilities. Workarounds that mitigate some of these\nvulnerabilities are available. \n\nThis advisory is posted at\nhttp://www.cisco.com/warp/public/707/cisco-sa-20081022-asa.shtml. \n\nAffected Products\n=================\n\nVulnerable Products\n+------------------\n\nThe following are the details about each vulnerability described within\nthis advisory. Devices that are\nusing any other type of external authentication (that is, LDAP, RADIUS,\nTACACS+, SDI, or local database) are not affected by this vulnerability. \n\nThe following example demonstrates how Windows NT domain authentication\nis configured using the command line interface (CLI) on the Cisco ASA:\n\n    aaa-server NTAuth protocol nt\n     aaa-server NTAuth (inside) host 10.1.1.4\n     nt-auth-domain-controller primary1\n\nAlternatively, to see if a device is configured for Windows NT Domain\nauthentication use the\n\"show running-config | include nt-auth-domain-controller\"\ncommand. \nThis vulnerability does not affect devices configured only for IPv4. \n\nNote: IPv6 functionality is turned off by default. \n\nIPv6 is enabled on the Cisco ASA and Cisco PIX security appliance\nusing the \"ipv6 address\" interface command. To verify if a device\nis configured for IPv6 use the \"show running-config | include ipv6\"\ncommand. \n\nAlternatively, you can display the status of interfaces configured for\nIPv6 using the show ipv6 interface command in privileged EXEC mode, as\nshown in the following example:\n\n    hostname# show ipv6 interface brief\n    outside [up/up]\n        unassigned\n    inside [up/up]\n        fe80::20d:29ff:fe1d:69f0\n        fec0::a:0:0:a0a:a70\n    dmz [up/up]\n        unassigned\n\nIn this example, the \"outside\" and \"dmz\" interfaces are not configured\nfor IPv6. \n\nCrypto Accelerator Memory Leak Vulnerability\n+-------------------------------------------\n\nCisco ASA security appliances may experience a memory leak that can be\ntriggered by a series of crafted packets. This memory leak occurs in the\ninitialization code for the hardware crypto accelerator. Devices that\nare running software versions in the 8.0.x release are vulnerable. \n\nNote: Cisco ASA appliances that are running software versions in the\n7.0, 7.1, and 7.2 releases are not vulnerable. \n\nDetermination of Software Versions\n+---------------------------------\n\nThe \"show version\" command-line interface (CLI) command can be used to\ndetermine whether a vulnerable version of the Cisco PIX or Cisco ASA\nsoftware is running. The following example shows a Cisco ASA Security\nAppliance that runs software release 8.0(4):\n\n        ASA# show version\n\n        Cisco Adaptive Security Appliance Software Version 8.0(4)\n        Device Manager Version 6.0(1)\n\n        [...]\n\nCustomers who use the Cisco Adaptive Security Device Manager (ASDM) to\nmanage their devices can find the version of the software displayed in\nthe table in the login window or in the upper left corner of the ASDM\nwindow. \n\nProducts Confirmed Not Vulnerable\n+--------------------------------\n\nThe Cisco Firewall Services Module (FWSM) is not affected by any of\nthese vulnerabilities. Cisco PIX security appliances running versions\n6.x are not vulnerable. No other Cisco products are currently known to\nbe affected by these vulnerabilities. \n\nDetails\n=======\n\nThis Security Advisory describes multiple distinct vulnerabilities. \nThese vulnerabilities are independent of each other. NT Domain authentication is supported only for remote\naccess VPNs. Devices that are running software version\n7.2(4)9 or 7.2(4)10 and configured for IPv6 may be vulnerable. This\nvulnerability does not affect devices that are configured only for IPv4. \n\nNote: Devices that are running software versions in the 7.0, 7.1, 8.0,\nand 8.1 releases are not vulnerable. \n\nTo configure IPv6 on a Cisco ASA or Cisco PIX security appliance, at a\nminimum, each interface needs to be configured with an IPv6 link-local\naddress. Additionally, you can add a global address to the interface. \n\nNote: Only packets that are destined to the device (not transiting the\ndevice) may trigger the effects of this vulnerability. These packets\nmust be destined to an interface configured for IPv6. \n\nCrypto Accelerator Memory Leak Vulnerability\n+-------------------------------------------\n\nThe Cisco ASA security appliances may experience a memory leak triggered\nby a series of packets. This memory leak occurs in the initialization\ncode for the hardware crypto accelerator. \n\nNote: Only packets destined to the device (not transiting the device)\nmay trigger this vulnerability. \n\nThe following Cisco ASA features use the services the crypto accelerator\nprovides, and therefore may be affected by this vulnerability:\n\n  * Clientless WebVPN, SSL VPN Client, and AnyConnect Connections\n  * ASDM (HTTPS) Management Sessions\n  * Cut-Through Proxy for Network Access\n  * TLS Proxy for Encrypted Voice Inspection\n  * IP Security (IPsec) Remote Access and Site-to-site VPNs\n  * Secure Shell (SSH) Access\n\nThis vulnerability is documented in Cisco Bug ID CSCsj25896 and has\nbeen assigned the Common Vulnerabilities and Exposures (CVE) identifier\nCVE-2008-3817. \n\nVulnerability Scoring Details\n+----------------------------\n\nCisco has provided scores for the vulnerabilities in this advisory based\non the Common Vulnerability Scoring System (CVSS). The CVSS scoring in\nthis Security Advisory is done in accordance with CVSS version 2.0. \n\nCVSS is a standards-based scoring method that conveys vulnerability\nseverity and helps determine urgency and priority of response. \n\nCisco has provided a base and temporal score. Customers can then\ncompute environmental scores to assist in determining the impact of the\nvulnerability in individual networks. \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\n* Windows NT Domain Authentication Bypass Vulnerability (CSCsu65735)\n\nCVSS Base Score - 4.3\n    Access Vector -            Network\n    Access Complexity -        Medium\n    Authentication -           None\n    Confidentiality Impact -   Partial\n    Integrity Impact -         None\n    Availability Impact -      None\n\nCVSS Temporal Score - 3.7\n    Exploitability -           High\n    Remediation Level -        Official-Fix\n    Report Confidence -        Confirmed\n\n* Cisco ASA may reload after receiving certain IPv6 packets (CSCsu11575)\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\n* Crypto Accelerator Memory Leak (CSCsj25896)\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\nImpact\n======\n\nSuccessful exploitation of the VPN Authentication Bypass Vulnerability\nmay allow an attacker to successfully connect to the Cisco ASA via\nremote access IPSec or SSL-based VPN. The Denial of Service (DoS)\nvulnerabilities may cause a reload of the affected device. Repeated\nexploitation could result in a sustained DoS condition. \n\nSoftware Versions and Fixes\n===========================\n\nWhen considering software upgrades, also consult\nhttp://www.cisco.com/go/psirt and any subsequent advisories to determine\nexposure 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\nThe following list contains the first fixed software release of each\nvulnerability:\n\n+----------------------------------------+\n|                | Affected | First      |\n| Vulnerability  | Release  | Fixed      |\n|                |          | Version    |\n|----------------+----------+------------|\n|                | 7.0      | 7.0(8)3    |\n|                |----------+------------|\n| Windows NT     | 7.1      | 7.1(2)78   |\n|Domain          |----------+------------|\n| Authentication | 7.2      | 7.2(4)16   |\n|Bypass          |----------+------------|\n| Vulnerability  | 8.0      | 8.0(4)6    |\n|                |----------+------------|\n|                | 8.1      | 8.1(1)13   |\n|----------------+----------+------------|\n|                | 7.0      | Not        |\n|                |          | Vulnerable |\n|                |----------+------------|\n|                | 7.1      | Not        |\n|                |          | Vulnerable |\n|IPv6 Denial of  |----------+------------|\n| Service        | 7.2      | 7.2(4)11   |\n|Vulnerability   |----------+------------|\n|                | 8.0      | Not        |\n|                |          | Vulnerable |\n|                |----------+------------|\n|                | 8.1      | Not        |\n|                |          | Vulnerable |\n|----------------+----------+------------|\n|                | 7.0      | Not        |\n|                |          | Vulnerable |\n|                |----------+------------|\n|                | 7.1      | Not        |\n| Crypto         |          | Vulnerable |\n|Accelerator     |----------+------------|\n| Memory Leak    | 7.2      | Not        |\n| Vulnerability  |          | Vulnerable |\n|                |----------+------------|\n|                | 8.0      | 8.0(4)     |\n|                |----------+------------|\n|                | 8.1      | 8.1(2)     |\n+----------------------------------------+\n\nThe following maintenance software releases are the first software\nreleases that contain the fixes for the vulnerabilities mentioned in\nthis Security Advisory:\n\nFixed PIX software can be downloaded from:\n\nhttp://www.cisco.com/pcgi-bin/tablebuild.pl/pix?psrtdcat20e2\n\nFix ASA software can be downloaded from:\n\nhttp://www.cisco.com/pcgi-bin/tablebuild.pl/asa?psrtdcat20e2\n\nFor the \"Windows NT Domain Authentication Bypass Vulnerability\", only\ninterim fixed software is currently available. Customers wishing to\nupgrade to a fixed version instead of applying a workaround may download\nPIX and ASA interim versions from:\n\nhttp://www.cisco.com/pcgi-bin/tablebuild.pl/PIXPSIRT?psrtdcat20e2\n\nWorkarounds\n===========\n\nThis Security Advisory describes multiple distinct vulnerabilities. \nThese vulnerabilities and their respective workarounds are independent\nof each other. \n\nWindows NT Domain Authentication Bypass Vulnerability\n+----------------------------------------------------\n\nLDAP authentication is not affected by this vulnerability. \n\nNote: For more information about support for a specific AAA server\ntype, refer to the following link:\nhttp://www.cisco.com/en/US/docs/security/asa/asa80/configuration/guide/aaa.html#wp1069492\n\nIPv6 Denial of Service Vulnerability\n+-----------------------------------\n\nCustomers that do not require IPv6 functionality on their devices can\nuse the \"no ipv6 address\" interface sub-command to disable processing of\nIPv6 packets and eliminate their exposure\n\nCrypto Accelerator Memory Leak Vulnerability\n+-------------------------------------------\n\nThere are no workarounds for this vulnerability. \n\nObtaining Fixed Software\n========================\n\nCisco has released free software updates that address these\nvulnerabilities. Prior to deploying software, customers should consult\ntheir maintenance provider or check the software for feature set\ncompatibility and known issues specific to their environment. \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 at\nhttp://www.cisco.com/en/US/products/prod_warranties_item09186a008088e31f.html,\nor as otherwise set forth at Cisco.com Downloads at\nhttp://www.cisco.com/public/sw-center/sw-usingswc.shtml. \n\nDo not contact psirt@cisco.com or security-alert@cisco.com for software\nupgrades. \n\nCustomers with Service Contracts\n+-------------------------------\n\nCustomers with contracts should obtain upgraded software through their\nregular update channels. For most customers, this means that upgrades\nshould be obtained through the Software Center on Cisco\u0027s worldwide\nwebsite at http://www.cisco.com. \n\nCustomers using Third Party Support Organizations\n+------------------------------------------------\n\nCustomers whose Cisco products are provided or maintained through prior\nor existing agreements with third-party support organizations, such\nas Cisco Partners, authorized resellers, or service providers should\ncontact that support organization for guidance and assistance with the\nappropriate 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 fix\nis the most appropriate for use in the intended network before it is\ndeployed. \n\nCustomers without Service Contracts\n+----------------------------------\n\nCustomers who purchase direct from Cisco but do not hold a Cisco service\ncontract, and customers who purchase through third-party vendors but are\nunsuccessful in obtaining fixed software through their point of sale\nshould acquire upgrades by contacting the Cisco Technical Assistance\nCenter (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\nCustomers should have their product serial number available and be\nprepared to give the URL of this notice as evidence of entitlement to a\nfree upgrade. Free upgrades for non-contract customers must be requested\nthrough the TAC. \n\nRefer to http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html\nfor additional TAC contact information, including localized telephone\nnumbers, and instructions and e-mail addresses for use in various\nlanguages. \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\nThese vulnerabilities were found during internal testing and during the\nresolution of a technical support service request. \n\nStatus of this Notice: FINAL\n============================\n\nTHIS DOCUMENT IS PROVIDED ON AN \"AS IS\" BASIS AND DOES NOT IMPLY\nANY KIND 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 omits\nthe distribution URL in the following section is an uncontrolled copy,\nand may lack important information or contain factual 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-20081022-asa.shtml\n\nIn addition to worldwide web posting, a text version of this notice is\nclear-signed with the Cisco PSIRT PGP key and is posted to the following\ne-mail and Usenet news recipients. \n\n  * cust-security-announce@cisco.com\n  * first-bulletins@lists.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 mailing\nlists or newsgroups. Users concerned about this problem are encouraged\nto check the above URL for any updates. \n\nRevision History\n================\n\n+------------------------------------------------------------+\n| Revision 1.0  | 2008-October-22  | Initial public 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\nhttp://www.cisco.com/en/US/products/products_security_vulnerability_policy.html. \nThis includes instructions for press inquiries regarding Cisco\nsecurity notices. All Cisco security advisories are available at\nhttp://www.cisco.com/go/psirt. \n\n+--------------------------------------------------------------------\nCopyright 2007-2008 Cisco Systems, Inc. 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