Cisco IOS VTP wrap configuration manipulation
| cisco-ios-vtp-wrap-config-manipulation (28925) |  Medium Risk |
Description:
Cisco IOS and Cisco CatOS could allow a remote attacker to manipulate configuration updates caused by a negative integer wrap issue in the VTP (VLAN Trunking Protocol) feature. If an attacker can send VTP updates to a Cisco IOS or CatOS device, the attacker could revise the VTP revision to 0x7FFFFFFF. When the VLAN configuration is next changed, the revision will be increased to 0x80000000, which would result in the affected device being unable to communicate configuration changes to other devices.
Platforms Affected:
- Cisco, CatOS
- Cisco, IOS 12.1(19)
Remedy:
Refer to cisco-sr-20060913-vtp for upgrade or suggested workaround information. See References.
Consequences:
Data Manipulation
References:
- BugTraq Mailing List, Wed Sep 13 2006 - 07:18:41 CDT , Cisco IOS VTP issues at http://archives.neohapsis.com/archives/bugtraq/2006-09/0205.html.
- cisco-sr-20060913-vtp, Cisco Security Response: Cisco VLAN Trunking Protocol Vulnerabilities at http://www.cisco.com/warp/public/707/cisco-sr-20060913-vtp.shtml.
- BID-19998: Cisco IOS Multiple VLAN Trunking Protocol Vulnerabilities
- CVE-2006-4775: The VLAN Trunking Protocol (VTP) feature in Cisco IOS 12.1(19) and CatOS allows remote attackers to cause a denial of service by sending a VTP update with a revision value of 0x7FFFFFFF, which is incremented to 0x80000000 and is interpreted as a negative number in a signed context.
- OSVDB ID: 28776: Cisco IOS VTP Revision Integer Wrap DoS
- SA21896: Cisco IOS VTP Multiple Vulnerabilities
- SA21902: Cisco CatOS VTP Configuration Revision Handling Vulnerability
- SECTRACK ID: 1016843: Cisco IOS VLAN Trunking Protocol Bugs Let Remote Users Deny Service and Execute Arbitrary Code
- US-CERT VU#175148: Cisco IOS fails to properly verify the VTP configuration revision number
- VUPEN/ADV-2006-3600: Cisco IOS Multiple VLAN Trunking Protocol Code Execution and DoS Vulnerabilities
Reported:
Sep 13, 2006
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