Cisco Catalyst 802.1x Frame Forwarding Vulnerability

BID:2604

Info

Cisco Catalyst 802.1x Frame Forwarding Vulnerability

Bugtraq ID: 2604
Class: Unknown
CVE:
Remote: Yes
Local: No
Published: Apr 16 2001 12:00AM
Updated: Apr 16 2001 12:00AM
Credit: This vulnerability was announced to Bugtraq in a Cisco Security Advisory posted on April 16, 2001.
Vulnerable: Cisco Catalyst 5000 6.1 (2)
Cisco Catalyst 5000 6.1 (1c)
Cisco Catalyst 5000 5.5 (6)
Cisco Catalyst 5000 5.5 (4b)
Cisco Catalyst 5000 4.5 (11)
Cisco Catalyst 5000 4.5 (10)
Cisco Catalyst 2900 6.1 (2)
Cisco Catalyst 2900 5.5 (6)
Cisco Catalyst 2900 4.5 (11)
Not Vulnerable: Cisco Catalyst 5000 6.1 (3)
Cisco Catalyst 5000 5.5 (7)
Cisco Catalyst 5000 4.5 (12)
Cisco Catalyst 2900 6.1 (3)
Cisco Catalyst 2900 5.5 (7)
Cisco Catalyst 2900 4.5 (12)

Discussion

Cisco Catalyst 802.1x Frame Forwarding Vulnerability

The Catalyst Switch is a high performance, low cost switch distributed by Cisco Systems. It is designed to offer scalability, ease of use, and modular configuration for maximum flexibility.

A problem with the 5000 and 2900 series switches could make it possible to deny service to legitimate users of network resources. By sending a 802.1x frame to a switch with spanning tree protocol blocked port, the frame is forwarded on through the VLAN managed by the switch. This causes a storm of 802.1x frames.

Therefore, it is possible for a remote user to create a 802.1x frame storm on the segment of VLAN managed by the Catalyst Switch, affecting performance, and potentially creating a Denial of Service.

Exploit / POC

Cisco Catalyst 802.1x Frame Forwarding Vulnerability

Currently the SecurityFocus staff are not aware of any exploits for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected] <mailto:[email protected]>.

Solution / Fix

Cisco Catalyst 802.1x Frame Forwarding Vulnerability

Solution:
Upgraded firmware available:


Cisco Catalyst 5000 4.5 (10)

Cisco Catalyst 2900 4.5 (11)

Cisco Catalyst 5000 4.5 (11)

Cisco Catalyst 5000 5.5 (4b)

Cisco Catalyst 5000 5.5 (6)

Cisco Catalyst 2900 5.5 (6)

Cisco Catalyst 2900 6.1 (2)

Cisco Catalyst 5000 6.1 (2)

Cisco Catalyst 5000 6.1 (1c)

References

Cisco Catalyst 802.1x Frame Forwarding Vulnerability

References:

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