Cisco Catalyst 6500 and Cisco 7600 loopback address ACL bypass
| cisco-catalyst-loopback-acl-bypass (36826) |  Low Risk |
Description:
A design error in Cisco Catalyst 6500 and Cisco 7600 could allow a remote attacker from within the local network to bypass access control lists. The Supervisor module, Multilayer Switch Feature Card (MSFC), and other intelligent modules receive and process unfiltered packets from loopback addresses. If the system is running Hybrid Mode and Native Mode, an attacker could exploit this vulnerability to bypass access control lists.
*CVSS:
| Base Score: | 3.3 |
| Access Vector: | Adjacent Network |
| Access Complexity: | Low |
| Authentication: | None |
| Confidentiality Impact: | None |
| Integrity Impact: | Partial |
| Availability Impact: | None |
| Temporal Score: | 2.4 |
| Exploitability: | Unproven |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Bypass Security
Remedy:
Refer to cisco-sr-20070926-lb for patch, upgrade or suggested workaround information. See References.
References:
- cisco-sr-20070926-lb: Catalyst 6500 and Cisco 7600 Series Devices Accessible via Loopback Address.
- BID-25822: Cisco Catalyst 6500 and Cisco 7600 Loopback Access Control Bypass Vulnerability
- CVE-2007-5134: Cisco Catalyst 6500 and Cisco 7600 series devices use 127/8 IP addresses for Ethernet Out-of-Band Channel (EOBC) internal communication, which might allow remote attackers to send packets to an interface for which network exposure was unintended.
- SA26988: Cisco Catalyst 6500 / Cisco 7600 Series Devices Accessible Loopback Address Weakness
- SECTRACK ID: 1018742: Cisco Catalyst 6500 May Let Remote Users Bypass ACLs Using Loopback Addresses
- SECTRACK ID: 1018743: Cisco 7600 May Let Remote Users Bypass ACLs Using Loopback Addresses
- VUPEN/ADV-2007-3276: Cisco Catalyst 6500 and Cisco 7600 Series Loopback Address Security Bypass
Platforms Affected:
- Cisco Catalyst 6500 5.4(1)
- Cisco Catalyst 6500 7.5(1)
- Cisco Catalyst 6500 7.6(1)
- Cisco Catalyst 6500
- Cisco Catalyst 6500 WS-SVC-NAM-1 2.2(1A)
- Cisco Catalyst 6500 WS-SVC-NAM-1 3.1(1A)
- Cisco Catalyst 6500 WS-SVC-NAM-2 2.2(1A)
- Cisco Catalyst 6500 WS-SVC-NAM-2 3.1(1A)
- Cisco Catalyst 6500 WS-X6380-NAM 2.1(2)
- Cisco Catalyst 6500 WS-X6380-NAM 3.1(1A)
- Cisco Catalyst 7600
- Cisco Catalyst 7600 SUP2 MSFC2
- Cisco Catalyst 7600 SUP720 MSFC3
- Cisco Catalyst 7600 WS-SVC-NAM-1 2.2(1A)
- Cisco Catalyst 7600 WS-SVC-NAM-1 3.1(1A)
- Cisco Catalyst 7600 WS-SVC-NAM-2 2.2(1A)
- Cisco Catalyst 7600 WS-SVC-NAM-2 3.1(1A)
- Cisco Catalyst 7600 WS-X6380-NAM 2.1(2)
- Cisco Catalyst 7600 WS-X6380-NAM 3.1(1A)
Reported:
Sep 26, 2007
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For corrections or additions please email xforce@iss.net
* According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
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.