Cisco has confirmed a DoS vulnerability in their IOS.
This is the Cisco Product Security Incident Response Team (PSIRT) response to a vulnerability that was reported on the Cisco NSP mailing list on August 17, 2007 regarding the crash and reload of devices running Cisco IOS® after executing a command that uses, either directly or indirectly, a regular expression. The original post is available at the following link:
https://puck.nether.net/pipermail/cisco-nsp/2007-August/043002.html
The Cisco PSIRT posted a preliminary response on the same day and is available at the following link:
https://puck.nether.net/pipermail/cisco-nsp/2007-August/043010.html
Preliminary research pointed to a previously known issue that was documented as Cisco bug ID CSCsb08386 (registered customers only) , and entitled “PRP crash by show ip bgp regexp”, which was already resolved. Further research indicates that the current issue is a different but related vulnerability.
There are no workarounds available for this vulnerability. Cisco will update this document in the event of any changes.
Tags: Cisco, Cisco IOS, Cisco IOS Vulnerability, Cisco IOS DoS
