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>> Cisco IOS/CatOS VLAN Trunking Protocol DoS Vulnerability

Title : Cisco IOS/CatOS VLAN Trunking Protocol DoS Vulnerability
VUPEN ID : VUPEN/ADV-2008-3031
CVE ID : CVE-2008-4963
CWE ID : CWE-399
Rated as : Low Risk 
Remotely Exploitable : Yes
Locally Exploitable : Yes
Release Date : 2008-11-06


Technical Description    Receive VUPEN Security alerts in a Text format  Receive VUPEN Security alerts in a PDF format  Receive VUPEN Security alerts in an XML format 

A vulnerability has been identified in Cisco IOS and CatOS, which could be exploited by attackers to cause a denial of service. This issue is caused by an error when processing malformed VLAN Trunking Protocol (VTP) packets sent from the local network segment to a switch interface configured to operate as a trunk port while the device is operating in either server or client VTP mode, which could allow attackers to cause a vulnerable device to crash or reload, creating a denial of service condition.

Affected Products

Cisco IOS
Cisco CatOS

Solution

Switch configuration best practices limit exposure to exploitation :
http://www.cisco.com/en/US/products/hw/switches/ps700/products_white_paper09186a00801b49a4.shtml#cg4
http://www.cisco.com/en/US/products/hw/switches/ps663/products_tech_note09186a0080094713.shtml#dtp

VUPEN Security is not aware of any vendor-supplied patch.

References

http://www.vupen.com/english/advisories/2008/3031
http://www.cisco.com/warp/public/707/cisco-sr-20081105-vtp.shtml

Credits

Vulnerability reported by showrun.lee.

ChangeLog

2008-11-06 : Initial release

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