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.
*CVSS:
| Base Score: | 2.8 |
| Access Vector: | Remote |
| Access Complexity: | High |
| Authentication: | Not Required |
| Confidentiality Impact: | None |
| Integrity Impact: | Partial |
| Availability Impact: | None |
| Temporal Score: | 2.3 |
| Exploitability: | Unproven |
| Remediation Level: | Workaround |
| Report Confidence: | Confirmed |
Consequences:
Data Manipulation
Remedy:
Refer to cisco-sr-20060913-vtp for upgrade or suggested workaround information. See References.
References:
- BugTraq Mailing List, Wed Sep 13 2006 - 07:18:41 CDT : Cisco IOS VTP issues.
- cisco-sr-20060913-vtp: Cisco Security Response: Cisco VLAN Trunking Protocol Vulnerabilities.
- 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
Platforms Affected:
- Cisco CatOS
- Cisco IOS 12.1(19)
Reported:
Sep 13, 2006
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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.