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Cisco 6000/6500/7600 Series Denial of Service Vulnerability
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Secunia Advisory:
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SA10780
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Release Date:
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2004-02-04
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Last Update:
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2004-03-31
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Popularity:
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9,958 views
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Critical:
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Less critical
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Impact:
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DoS
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Where:
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From local network
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Solution Status:
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Vendor Patch
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| OS: | Cisco IOS 12.x
Cisco IOS R12.x
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Description:
Cisco has reported a vulnerability in Cisco 6000/6500/7600 network devices, which can be exploited by malicious people to cause a Denial of Service.
The problem is that Cisco 6000/6500/7600 fails to handle inconsistencies in the size of OSI layer 2 (Data Link) and OSI layer 3 (Network) frames. This can be exploited to crash a vulnerable network device by crafting a malicious OSI layer 2 frame and sending it multiple times.
This attack can only be carried out on a local network. Any system not transmitting OSI layer 2 traffic such as a router or firewall will prevent malicious packets from being transmitted.
The vulnerability affects the following configurations:
* Cisco 6000/6500/7600 series with a MSFC2 and FlexWAN module or OSM module.
* Cisco 6000/6500/7600 series with a MSFC2 module running IOS 12.1(8b)E14.
Solution:
The vulnerability has been fixed in the following versions:
http://www.cisco.com/tacpage/sw-center/sw-ios.shtml
12.1(8b)E15
12.1(13.5)E
12.1(19)E
12.1(11b)E14
12.1(13)E1
12.2(14)SY
12.2(14)ZA
Provided and/or discovered by:
Reported by vendor.
Changelog:
2004-03-31: Added link to US-CERT vulnerability note.
Original Advisory:
http://www.cisco.com/warp/public/707/cisco-sa-20040203-cat6k.shtml
Other References:
US-CERT VU#810062:
http://www.kb.cert.org/vuls/id/810062
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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