A vulnerability in the way Cisco IOS handles IPv6 packets could result in a remotely exploitable denial of service.
The Cisco Internetwork Operating System (IOS) includes support for processing Internet Protocol version 6 (IPv6) packets.
Per Cisco Advisory cisco-sa-20080326-IPv4IPv6:
A device running Cisco IOS software that has Internet Protocol version 6 (IPv6) enabled may be subject to a denial of service (DoS) attack. For the device to be affected by this vulnerability the device also has to have certain Internet Protocol version 4 (IPv4) User Datagram Protocol (UDP) services enabled. To exploit this vulnerability an offending IPv6 packet must be targeted to the device. Packets that are routed throughout the router can not trigger this vulnerability. Successful exploitation will prevent the interface from receiving any additional traffic. The only exception is Resource Reservation Protocol (RSVP) service, which if exploited, will cause the device to crash. Only the interface on which the vulnerability was exploited will be affected.
A remote, unauthenticated attacker could cause a vulnerable system to crash or stop forwarding network traffic.
Upgrade
Cisco has made updates available to address this issue.
Disable IPv6
If it is not needed, disabling IPv6 access will mitigate this vulnerability. See the workarounds section of cisco-sa-20080326-IPv4IPv6 for more information.
Disable IPv4 UDP
If it is not needed, disabling UDP on IPv4 enabled interfaces will mitigate this vulnerability. See the workarounds section of cisco-sa-20080326-IPv4IPv6 for more information.
936177
Filter by status: All Affected Not Affected Unknown
Filter by content: __ Additional information available
__ Sort by: Status Alphabetical
Expand all
Javascript is disabled. Click here to view vendors.
Updated: March 26, 2008
Affected
We have not received a statement from the vendor.
The vendor has not provided us with any further information regarding this vulnerability.
See <http://www.cisco.com/warp/public/707/cisco-sa-20080326-IPv4IPv6.shtml> for more information.
If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23936177 Feedback>).
Group | Score | Vector |
---|---|---|
Base | ||
Temporal | ||
Environmental |
Thanks to Cisco for information that was used in this report.
This document was written by Ryan Giobbi.
CVE IDs: | CVE-2008-1153 |
---|---|
Severity Metric: | 10.55 Date Public: |