var-201105-0194
Vulnerability from variot
Cisco IOS XR 3.9.x and 4.0.x before 4.0.3 and 4.1.x before 4.1.1, when an SPA interface processor is installed, allows remote attackers to cause a denial of service (device reload) via a crafted IPv4 packet, aka Bug ID CSCto45095. An attacker can exploit this issue to cause a denial-of-service condition. This issue is being tracked by Cisco Bug ID CSCto45095. ----------------------------------------------------------------------
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TITLE: Cisco IOS XR Multiple Vulnerabilities
SECUNIA ADVISORY ID: SA44725
VERIFY ADVISORY: Secunia.com http://secunia.com/advisories/44725/ Customer Area (Credentials Required) https://ca.secunia.com/?page=viewadvisory&vuln_id=44725
RELEASE DATE: 2011-05-26
DISCUSS ADVISORY: http://secunia.com/advisories/44725/#comments
AVAILABLE ON SITE AND IN CUSTOMER AREA: * Last Update * Popularity * Comments * Criticality Level * Impact * Where * Solution Status * Operating System / Software * CVE Reference(s)
http://secunia.com/advisories/44725/
ONLY AVAILABLE IN CUSTOMER AREA: * Authentication Level * Report Reliability * Secunia PoC * Secunia Analysis * Systems Affected * Approve Distribution * Remediation Status * Secunia CVSS Score * CVSS
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DESCRIPTION: Some vulnerabilities have been reported in Cisco IOS XR, which can be exploited by malicious people to cause a DoS (Denial of Service).
1) An unspecified error exists when processing IPv4 packets originating from the Cisco Line Card or Cisco CRS MSC and can be exploited to crash the NetIO process.
2) An error in the SSH server when handling an SSHv1 connection does not delete sshd_lock files in the /tmp directory. This can be exploited to consume all available disk space in the /tmp filesystem and cause a crash.
Please see the vendor's advisory for the list of affected products and versions.
SOLUTION: Apply updates. Please see the vendor's advisory for more information.
PROVIDED AND/OR DISCOVERED BY: 1) Reported by the vendor. 2) The vendor credits a customer. 3) Reported by the vendor.
ORIGINAL ADVISORY: Cisco: http://www.cisco.com/warp/public/707/cisco-sa-20110525-iosxr.shtml http://www.cisco.com/warp/public/707/cisco-sa-20110525-iosxr-ssh.shtml http://www.cisco.com/warp/public/707/cisco-sa-20110525-iosxrspa.shtml
OTHER REFERENCES: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/
DEEP LINKS: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/
EXTENDED DESCRIPTION: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/
EXTENDED SOLUTION: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/
EXPLOIT: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/
About: This Advisory was delivered by Secunia as a free service to help private users keeping their systems up to date against the latest vulnerabilities.
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.
Cisco has released free Software Maintenance Units (SMU) that address this vulnerability.
Workarounds that mitigate this vulnerability are not available.
Vulnerable Products +------------------
This vulnerability affects all Engine 5 Line Cards on the Cisco XR 12000 Series Routers. The engine 5 line cards are the SIP-600, SIP-601, SIP-501, and SIP-401.
To determine the Cisco IOS XR Software release that is running on a Cisco product, administrators can log in to the device and issue the show version command-line interface (CLI) command to display the system banner. The system banner confirms that the device is running Cisco IOS XR Software by displaying text that is similar to "Cisco IOS XR Software". The software version is displayed after the text "Cisco IOS XR Software".
The following example identifies a Cisco XR 12000 Series Router that is running Cisco IOS XR Software Release 3.9.1:
RP/0/0/CPU0:example#show version
Wed Dec 15 10:16:47.117 singa
Cisco IOS XR Software, Version 3.9.1[00]
Copyright (c) 2010 by Cisco Systems, Inc.
ROM: System Bootstrap, Version 12.0(20090302:133850) [rtauro-sw30346-33S 1.23dev(0.36)] DEVELOPMENT SOFTWARE
Copyright (c) 1994-2009 by cisco Systems, Inc.
example uptime is 26 minutes
System image file is "disk0:c12k-os-mbi-3.9.1/mbiprp-rp.vm"
cisco 12404/PRP (7457) processor with 3145728K bytes of memory.
7457 processor at 1266Mhz, Revision 1.2
1 Cisco 12000 Series Performance Route Processor
1 Cisco 12000 Series SPA Interface Processor-601/501/401
1 Cisco 12000 4 Port Gigabit Ethernet Controller (4 GigabitEthernet)
3 Management Ethernet
5 PLIM_QOS
8 FastEthernet
4 GigabitEthernet/IEEE 802.3 interface(s)
1019k bytes of non-volatile configuration memory.
982304k bytes of disk0: (Sector size 512 bytes).
62420k bytes of disk1: (Sector size 512 bytes).
65536k bytes of Flash internal SIMM (Sector size 256k).
!--- output truncated
To determine if a SPA interface processor is installed in the device, administrators can log in to the device and issue the show platform command to display the system line cards.
The following products are not affected by this vulnerability:
- Cisco 12000 Series SPA interface processors running Cisco IOS Software
- Cisco XR 12000 Series Engine 3 Line Cards
- Cisco ASR 9000 Series Aggregation Services Routers
- Cisco Carrier Routing System Series Routers
No other Cisco products are currently known to be affected by this vulnerability
Details
Cisco IOS XR Software, which is part of the Cisco IOS Software family, uses a microkernel-based distributed operating system infrastructure. Cisco IOS XR Software runs on the Cisco CRS, Cisco 12000 Series Routers, and Cisco ASR 9000 Series Aggregation Services Routers.
When the SPA interface processor receives specific IPv4 packets destined for either a network or a network broadcast address of a configured interface, it will reload and produce an error message that is similar to what is shown in the example that follows. Transit traffic through the device does not trigger this vulnerability.
RP/0/4/CPU0:Example#LC/0/1/CPU0:Apr 26 17:16:31.745 : tx_xbma[85]:
%L2-E5EGRESSQ-4-INTERRUPT : WIM error: reg 0x200000
This vulnerability is documented in Cisco bug ID CSCto45095 ( registered customers only) and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2011-1651.
Vulnerability Scoring Details +----------------------------
Cisco has provided scores for the vulnerability 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
- Cisco XR 12000 Series SPA Interface Processor 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
Impact
Successful exploitation of the vulnerability may result in a reloading of the SPA interface processor. Repeated exploitation could result in a sustained denial of service (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.
+--------------------------------------------------------------+ | Major | Availability of Repaired Releases | | Release | | |----------+---------------------------------------------------| | Affected | | | First | | 3.2.X | SMU ID | SMU NAME | Fixed | | through | | | Release | |3.8.X |---------------------------------------------------| | Based | There are no affected 3.2.X through 3.8.X based | | Releases | releases | |----------+---------------------------------------------------| | Affected | | | First | | 3.9.X | SMU ID | SMU NAME | Fixed | | Based | | | Release | | Releases | | | | |----------+---------+------------------------------+----------| | | | | No first | | | | | fixed | | | | | release; | | 3.9.0 | None | No SMU available; Contact | Migrate | | | | your Support Organization | to | | | | | 4.0.3, | | | | | 4.1.1 or | | | | | later. | |----------+---------+------------------------------+----------| | | | | No first | | | | | fixed | | | | | release; | | 3.9.1 | AA04896 | c12k-os-mbi-3.9.1.CSCto45095 | Migrate | | | | | to | | | | | 4.0.3, | | | | | 4.1.1 or | | | | | later. | |----------+---------+------------------------------+----------| | | | | No first | | | | | fixed | | | | | release; | | 3.9.2 | AA04907 | c12k-os-mbi-3.9.2.CSCto45095 | Migrate | | | | | to | | | | | 4.0.3, | | | | | 4.1.1 or | | | | | later. | |----------+---------+------------------------------+----------| | Affected | | | First | | 4.0.x | SMU ID | SMU NAME | Fixed | | Based | | | Release | | Releases | | | | |----------+---------+------------------------------+----------| | 4.0.0 | None | No SMU available; Contact | 4.0.3 | | | | your Support Organization | | |----------+---------+------------------------------+----------| | 4.0.1 | AA04884 | c12k-4.0.1.CSCto45095 | 4.0.3 | |----------+---------------------------------------------------| | 4.0.3 | Not Affected | |----------+---------------------------------------------------| | Affected | | | First | | 4.1.x | SMU ID | SMU NAME | Fixed | | Based | | | Release | | Releases | | | | |----------+---------+------------------------------+----------| | 4.1.0 | None | No SMU available; Contact | 4.1.1 | | | | your Support Organization | | |----------+---------------------------------------------------| | 4.1.1 | Not Affected | +--------------------------------------------------------------+
Workarounds
There are no workarounds for this vulnerability.
Using Infrastructure Access Control Lists (iACLs) may help limit the attack surface of this vulnerability. Although it is often difficult to block traffic that transits a network, it is possible to identify traffic that should never be allowed to target infrastructure devices and block that traffic at the border of networks. As a network security best practice, iACLs should be considered a long-term addition to good network security. Because some of the packets used in this vulnerability could utilize UDP as a transport, it could be possible to spoof the sender's IP address, which may defeat ACLs that permit communication to these ports from trusted IP addresses. Unicast RPF should be considered to be used in conjunction to offer a better mitigation solution.
For more information on iACLs, consult the document "Limit Network Access with Access Control Lists" at the following location: http://www.cisco.com/web/about/security/intelligence/CiscoIOSXR.html#19
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/docs/general/warranty/English/EU1KEN_.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 vulnerability described in this advisory.
This vulnerability was discovered when handling customer support calls.
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-20110525-iosxrspa.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 | | Initial | | 1.0 | 2011-May-25 | 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
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"data": "Cisco IOS XR 3.9.x and 4.0.x before 4.0.3 and 4.1.x before 4.1.1, when an SPA interface processor is installed, allows remote attackers to cause a denial of service (device reload) via a crafted IPv4 packet, aka Bug ID CSCto45095. \nAn attacker can exploit this issue to cause a denial-of-service condition. \nThis issue is being tracked by Cisco Bug ID CSCto45095. ----------------------------------------------------------------------\n\n\nAlerts when vulnerabilities pose a threat to your infrastructure\nThe enhanced reporting module of the Secunia Vulnerability Intelligence Manager (VIM) enables you to combine advisory and ticket information, and generate policy compliance statistics. Using your asset list preferences, customised notifications are issued as soon as a new vulnerability is discovered - a valuable tool for documenting mitigation strategies. \nWatch our quick solution overview:\nhttp://www.youtube.com/user/Secunia#p/a/u/0/M1Y9sJqR2SY\n\n\n----------------------------------------------------------------------\n\nTITLE:\nCisco IOS XR Multiple Vulnerabilities\n\nSECUNIA ADVISORY ID:\nSA44725\n\nVERIFY ADVISORY:\nSecunia.com\nhttp://secunia.com/advisories/44725/\nCustomer Area (Credentials Required)\nhttps://ca.secunia.com/?page=viewadvisory\u0026vuln_id=44725\n\nRELEASE DATE:\n2011-05-26\n\nDISCUSS ADVISORY:\nhttp://secunia.com/advisories/44725/#comments\n\nAVAILABLE ON SITE AND IN CUSTOMER AREA:\n * Last Update\n * Popularity\n * Comments\n * Criticality Level\n * Impact\n * Where\n * Solution Status\n * Operating System / Software\n * CVE Reference(s)\n\nhttp://secunia.com/advisories/44725/\n\nONLY AVAILABLE IN CUSTOMER AREA:\n * Authentication Level\n * Report Reliability\n * Secunia PoC\n * Secunia Analysis\n * Systems Affected\n * Approve Distribution\n * Remediation Status\n * Secunia CVSS Score\n * CVSS\n\nhttps://ca.secunia.com/?page=viewadvisory\u0026vuln_id=44725\n\nONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:\n * AUTOMATED SCANNING\n\nhttp://secunia.com/vulnerability_scanning/personal/\nhttp://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/\n\nDESCRIPTION:\nSome vulnerabilities have been reported in Cisco IOS XR, which can be\nexploited by malicious people to cause a DoS (Denial of Service). \n\n1) An unspecified error exists when processing IPv4 packets\noriginating from the Cisco Line Card or Cisco CRS MSC and can be\nexploited to crash the NetIO process. \n\n2) An error in the SSH server when handling an SSHv1 connection does\nnot delete sshd_lock files in the /tmp directory. This can be\nexploited to consume all available disk space in the /tmp filesystem\nand cause a crash. \n\nPlease see the vendor\u0027s advisory for the list of affected products\nand versions. \n\nSOLUTION:\nApply updates. Please see the vendor\u0027s advisory for more information. \n\nPROVIDED AND/OR DISCOVERED BY:\n1) Reported by the vendor. \n2) The vendor credits a customer. \n3) Reported by the vendor. \n\nORIGINAL ADVISORY:\nCisco:\nhttp://www.cisco.com/warp/public/707/cisco-sa-20110525-iosxr.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20110525-iosxr-ssh.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20110525-iosxrspa.shtml\n\nOTHER REFERENCES:\nFurther details available in Customer Area:\nhttp://secunia.com/products/corporate/EVM/\n\nDEEP LINKS:\nFurther details available in Customer Area:\nhttp://secunia.com/products/corporate/EVM/\n\nEXTENDED DESCRIPTION:\nFurther details available in Customer Area:\nhttp://secunia.com/products/corporate/EVM/\n\nEXTENDED SOLUTION:\nFurther details available in Customer Area:\nhttp://secunia.com/products/corporate/EVM/\n\nEXPLOIT:\nFurther details available in Customer Area:\nhttp://secunia.com/products/corporate/EVM/\n\n----------------------------------------------------------------------\n\nAbout:\nThis Advisory was delivered by Secunia as a free service to help\nprivate users 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. \n\n----------------------------------------------------------------------\n\nUnsubscribe: Secunia Security Advisories\nhttp://secunia.com/sec_adv_unsubscribe/?email=packet%40packetstormsecurity.org\n\n----------------------------------------------------------------------\n\n\n. \n\nCisco has released free Software Maintenance Units (SMU) that address\nthis vulnerability. \n\nWorkarounds that mitigate this vulnerability are not available. \n\nVulnerable Products\n+------------------\n\nThis vulnerability affects all Engine 5 Line Cards on the Cisco XR\n12000 Series Routers. The engine 5 line cards are the SIP-600,\nSIP-601, SIP-501, and SIP-401. \n\nTo determine the Cisco IOS XR Software release that is running on a\nCisco product, administrators can log in to the device and issue the \nshow version command-line interface (CLI) command to display the\nsystem banner. The system banner confirms that the device is running\nCisco IOS XR Software by displaying text that is similar to \"Cisco\nIOS XR Software\". The software version is displayed after the text\n\"Cisco IOS XR Software\". \n\nThe following example identifies a Cisco XR 12000 Series Router that\nis running Cisco IOS XR Software Release 3.9.1:\n\n RP/0/0/CPU0:example#show version\n Wed Dec 15 10:16:47.117 singa\n \n Cisco IOS XR Software, Version 3.9.1[00]\n Copyright (c) 2010 by Cisco Systems, Inc. \n \n ROM: System Bootstrap, Version 12.0(20090302:133850) [rtauro-sw30346-33S 1.23dev(0.36)] DEVELOPMENT SOFTWARE\n Copyright (c) 1994-2009 by cisco Systems, Inc. \n \n example uptime is 26 minutes\n System image file is \"disk0:c12k-os-mbi-3.9.1/mbiprp-rp.vm\"\n \n cisco 12404/PRP (7457) processor with 3145728K bytes of memory. \n 7457 processor at 1266Mhz, Revision 1.2\n \n 1 Cisco 12000 Series Performance Route Processor\n 1 Cisco 12000 Series SPA Interface Processor-601/501/401\n 1 Cisco 12000 4 Port Gigabit Ethernet Controller (4 GigabitEthernet)\n 3 Management Ethernet\n 5 PLIM_QOS\n 8 FastEthernet\n 4 GigabitEthernet/IEEE 802.3 interface(s)\n 1019k bytes of non-volatile configuration memory. \n 982304k bytes of disk0: (Sector size 512 bytes). \n 62420k bytes of disk1: (Sector size 512 bytes). \n 65536k bytes of Flash internal SIMM (Sector size 256k). \n \n !--- output truncated\n\nTo determine if a SPA interface processor is installed in the device,\nadministrators can log in to the device and issue the show platform\ncommand to display the system line cards. \n\nThe following products are not affected by this vulnerability:\n\n * Cisco 12000 Series SPA interface processors running Cisco IOS\n Software\n * Cisco XR 12000 Series Engine 3 Line Cards\n * Cisco ASR 9000 Series Aggregation Services Routers\n * Cisco Carrier Routing System Series Routers\n\nNo other Cisco products are currently known to be affected by this\nvulnerability\n\nDetails\n=======\n\nCisco IOS XR Software, which is part of the Cisco IOS Software\nfamily, uses a microkernel-based distributed operating system\ninfrastructure. Cisco IOS XR Software runs on the Cisco CRS, Cisco\n12000 Series Routers, and Cisco ASR 9000 Series Aggregation Services\nRouters. \n\nWhen the SPA interface processor receives specific IPv4 packets\ndestined for either a network or a network broadcast address of a\nconfigured interface, it will reload and produce an error message\nthat is similar to what is shown in the example that follows. Transit\ntraffic through the device does not trigger this vulnerability. \n\n RP/0/4/CPU0:Example#LC/0/1/CPU0:Apr 26 17:16:31.745 : tx_xbma[85]:\n %L2-E5EGRESSQ-4-INTERRUPT : WIM error: reg 0x200000\n\nThis vulnerability is documented in Cisco bug ID CSCto45095 ( \nregistered customers only) and has been assigned Common\nVulnerabilities and Exposures (CVE) ID CVE-2011-1651. \n\nVulnerability Scoring Details\n+----------------------------\n\nCisco has provided scores for the vulnerability 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\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\nthe vulnerability 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* Cisco XR 12000 Series SPA Interface Processor 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 \n\nImpact\n======\n\nSuccessful exploitation of the vulnerability may result in a\nreloading of the SPA interface processor. Repeated exploitation could\nresult in a sustained denial of service (DoS) condition. \n\nSoftware Versions and Fixes\n===========================\n\nWhen considering software upgrades, also consult: \nhttp://www.cisco.com/go/psirt \nand any subsequent advisories to determine exposure and a\ncomplete 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\n+--------------------------------------------------------------+\n| Major | Availability of Repaired Releases |\n| Release | |\n|----------+---------------------------------------------------|\n| Affected | | | First |\n| 3.2.X | SMU ID | SMU NAME | Fixed |\n| through | | | Release |\n|3.8.X |---------------------------------------------------|\n| Based | There are no affected 3.2.X through 3.8.X based |\n| Releases | releases |\n|----------+---------------------------------------------------|\n| Affected | | | First |\n| 3.9.X | SMU ID | SMU NAME | Fixed |\n| Based | | | Release |\n| Releases | | | |\n|----------+---------+------------------------------+----------|\n| | | | No first |\n| | | | fixed |\n| | | | release; |\n| 3.9.0 | None | No SMU available; Contact | Migrate |\n| | | your Support Organization | to |\n| | | | 4.0.3, |\n| | | | 4.1.1 or |\n| | | | later. |\n|----------+---------+------------------------------+----------|\n| | | | No first |\n| | | | fixed |\n| | | | release; |\n| 3.9.1 | AA04896 | c12k-os-mbi-3.9.1.CSCto45095 | Migrate |\n| | | | to |\n| | | | 4.0.3, |\n| | | | 4.1.1 or |\n| | | | later. |\n|----------+---------+------------------------------+----------|\n| | | | No first |\n| | | | fixed |\n| | | | release; |\n| 3.9.2 | AA04907 | c12k-os-mbi-3.9.2.CSCto45095 | Migrate |\n| | | | to |\n| | | | 4.0.3, |\n| | | | 4.1.1 or |\n| | | | later. |\n|----------+---------+------------------------------+----------|\n| Affected | | | First |\n| 4.0.x | SMU ID | SMU NAME | Fixed |\n| Based | | | Release |\n| Releases | | | |\n|----------+---------+------------------------------+----------|\n| 4.0.0 | None | No SMU available; Contact | 4.0.3 |\n| | | your Support Organization | |\n|----------+---------+------------------------------+----------|\n| 4.0.1 | AA04884 | c12k-4.0.1.CSCto45095 | 4.0.3 |\n|----------+---------------------------------------------------|\n| 4.0.3 | Not Affected |\n|----------+---------------------------------------------------|\n| Affected | | | First |\n| 4.1.x | SMU ID | SMU NAME | Fixed |\n| Based | | | Release |\n| Releases | | | |\n|----------+---------+------------------------------+----------|\n| 4.1.0 | None | No SMU available; Contact | 4.1.1 |\n| | | your Support Organization | |\n|----------+---------------------------------------------------|\n| 4.1.1 | Not Affected |\n+--------------------------------------------------------------+\n\nWorkarounds\n\nThere are no workarounds for this vulnerability. \n\nUsing Infrastructure Access Control Lists (iACLs) may help limit the\nattack surface of this vulnerability. Although it is often difficult\nto block traffic that transits a network, it is possible to identify\ntraffic that should never be allowed to target infrastructure devices\nand block that traffic at the border of networks. As a network\nsecurity best practice, iACLs should be considered a long-term\naddition to good network security. Because some of the packets used\nin this vulnerability could utilize UDP as a transport, it could be\npossible to spoof the sender\u0027s IP address, which may defeat ACLs that\npermit communication to these ports from trusted IP addresses. \nUnicast RPF should be considered to be used in conjunction to offer a\nbetter mitigation solution. \n\nFor more information on iACLs, consult the document \"Limit Network\nAccess with Access Control Lists\" at the following location: \nhttp://www.cisco.com/web/about/security/intelligence/CiscoIOSXR.html#19\n\nObtaining Fixed Software\n========================\n\nCisco has released free software updates that address these\nvulnerabilities. Prior to deploying software, customers should\nconsult their maintenance provider or check the software for feature\nset compatibility 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/docs/general/warranty/English/EU1KEN_.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\nsoftware upgrades. \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 agreements 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 do not hold a Cisco\nservice contract, and customers who purchase through third-party\nvendors but are unsuccessful in obtaining fixed software through\ntheir point of sale should acquire 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\nCustomers should have their product serial number available and be\nprepared to give the URL of this notice as evidence of entitlement to\na free upgrade. Free upgrades for non-contract customers must be\nrequested through the TAC. \n\nRefer to:\nhttp://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 languages. \n\nExploitation and Public Announcements\n=====================================\n\nThe Cisco PSIRT is not aware of any public announcements or malicious\nuse of the vulnerability described in this advisory. \n\nThis vulnerability was discovered when handling customer support\ncalls. \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-20110525-iosxrspa.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-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\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 | 2011-May-25 | 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:\nhttp://www.cisco.com/en/US/products/products_security_vulnerability_policy.html\nThis includes instructions for press inquiries regarding Cisco security notices. \nAll Cisco security advisories are available at:\nhttp://www.cisco.com/go/psirt\n\n+--------------------------------------------------------------------\nCopyright 2010-2011 Cisco Systems, Inc. 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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.