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[sec-adv] Cisco Catalyst Switch Non-Standard TCP Flag Combination DoS Vulnerability
From: Secunia Security Advisories (sec-adv
secunia.com)
Date: Wed Jul 09 2003 - 09:25:07 CDT
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TITLE:
Cisco Catalyst Switch Non-Standard TCP Flag Combination DoS
Vulnerability
READ ONLINE:
http://www.secunia.com/advisories/9223/
CRITICAL:
Less critical
IMPACT:
DoS
WHERE:
From local network
OPERATING SYSTEM:
Cisco CATOS 7.x
Cisco CATOS 5.x
Cisco CATOS 6.x
DESCRIPTION:
Cisco has reported a vulnerability in CatOS for various Catalyst
switches, which can be exploited by malicious people to cause a DoS
(Denial of Service) on certain active services on a vulnerable
device.
The vulnerability is caused due to an error in the handling of
certain TCP packets. This can be exploited by making just eight (8)
TCP connection attempts with a non-standard TCP flag combination to a
listening service. After receiving the connection attempts, the
service will stop responding to further connection attempts.
The vulnerability has been reported to affect the following Catalyst
models:
- Catalyst 4000 Series including models 2948G and 2980G/2980G-A
- Catalyst 5000 Series including models 2901, 2902 and 2926
- Catalyst 6000
SOLUTION:
Cisco has released upgraded CatOS versions. A patch matrix is
available at the web page (in the "Software Versions and Fixes"
section) referenced in "Original Advisory".
ORIGINAL ADVISORY:
http://www.cisco.com/warp/public/707/cisco-sa-20030709-swtcp.shtml
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