Cisco IOS XR Software Releases 3.3.0 to 4.2.0 contain a vulnerability when handling fragmented packets that could result in a denial of service (DoS) condition of the Cisco CRS Route Processor cards listed in the "Affected Products" section of this advisory. The vulnerability is due to improper handling of fragmented packets. The vulnerability could cause the route processor, which processes the packets, to be unable to transmit packets to the fabric. Customers that are running version 4.2.1 or later of Cisco IOS XR Software, or that have previously installed the Software Maintenance Upgrades (SMU) for Cisco bug ID CSCtz62593 are not affected by this vulnerability. Cisco has released software updates that address this vulnerability. This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20131023-iosxr
| Route Processor | Product Identifier (PID) |
| Cisco CRS-1 Distributed Route Processor | CRS-DRP-B consists of CRS-DRP-B-CPU and CRS-DRP-B-PLIM |
| Cisco CRS-1 16-Slot Line-Card Chassis Route Processor | CRS-16-RP |
| Cisco CRS-1 8-Slot Line-Card Chassis Route Processor | CRS-8-RP |
| Cisco CRS-1 16-Slot Line Card Chassis Route Processor B | CRS-16-RP-B |
| Cisco CRS Series 4/8-Slot Line Card Chassis Performance Route Processor (12 GB) | CRS-8-PRP-12G |
| Cisco CRS Series 4/8-Slot Line Card Chassis Performance Route Processor (6 GB) | CRS-8-PRP-6G |
| Cisco CRS Series 16-Slot Performance Route Processor (12 GB) | CRS-16-PRP-12G |
| Cisco CRS Series 16-Slot Performance Route Processor (6 GB) | CRS-16-PRP-6G |
The following example identifies a Cisco CRS series device that is running Cisco IOS XR Software Release 4.0.4:
Additional information about Cisco IOS XR Software release naming conventions is available in "White Paper: Cisco IOS Reference Guide" at the following link: http://www.cisco.com/web/about/security/intelligence/ios-ref.html#9RP/0/RP0/CPU0:CRS-G#show version | inc Cisco IOS XR Software Fri Apr 27 22:28:14.304 UTC Cisco IOS XR Software, Version 4.0.4[Default]
RP/0/RP1/CPU0:CRS-F#show inventory all | include CRS-16-PRP
Fri Oct 11 06:59:21.384 UTC
NAME: "0/RP0/*", DESCR: "Cisco CRS Series 16 Slots 6 GB Performance Route Processor"
PID: CRS-16-PRP-6G, VID: V00, SN: ----------- NAME: "0/RP1/*", DESCR: "Cisco CRS Series 16 Slots 6 GB Performance Route Processor"
PID: CRS-16-PRP-6G, VID: V00, SN: -----------
RP/0/RP0/CPU0:CRS-A#show inventory all | include CRS-16-RP
Thu Oct 10 00:13:06.849 PDT NAME: "0/RP0/*", DESCR: "Cisco CRS-1 Series 16 Slots Route Processor"
PID: CRS-16-RP, VID: V01, SN: ----------- NAME: "0/RP1/*", DESCR: "Cisco CRS-1 Series 16 Slots Route Processor revision B"
PID: CRS-16-RP-B, VID: V07, SN: -----------
There are no workarounds for the vulnerability described in this document.
When considering software upgrades, customers are advised to consult the Cisco Security Advisories, Responses, and Notices archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.
To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
| Revision 1.0 | 2013-October-23 | Initial public release. |
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 is an uncontrolled copy, and may lack important information or contain factual errors. The information in this document is intended for end-users of Cisco products.
Vulmon