Title: Cisco 12000 Series Internet Router ACL Failure To Drop Packets Vulnerability
Severity: HIGH
Description:
Cisco 12000 Series Internet Routers with line cards based on Engine 2 are prone to an unusual issue where they may fail to drop packets.
This issue occurs when an outgoing Access Control List(ACL) is exactly 448 lines and the last statement is not explicitly a "deny ip any any" rule.
This issue does not occur if the outgoing ACL is more or less than 448 lines.
The result is that some packets(approx. 50%) will not be dropped, potentially allowing restricted traffic into the network.
Cisco has assigned Vulnerability CSCdu03323 to this issue.
Affected Products:
- Cisco IOS 12.0S
- Cisco IOS 12.0ST
References:
- Cisco Systems: Cisco Product Security Incident Response
Juniper Networks provides this content via a wide variety of sources and production methods. If notified of errors or omissions in the content of this page, Juniper Networks, at its discretion, will modify or remove the page or leave the content as is, depending on various factors including but not limited to the reputation and authority of the party providing the notification. Please use the contact information displayed elsewhere on this page to report any errors or omissions regarding the content on this page.
