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.
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)
Remedy:
Refer to cisco-sr-20070926-lb for patch, upgrade or suggested workaround information. See References.
Consequences:
Bypass Security
References:
- cisco-sr-20070926-lb, Catalyst 6500 and Cisco 7600 Series Devices Accessible via Loopback Address at http://www.cisco.com/warp/public/707/cisco-sr-20070926-lb.shtml.
- 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
Reported:
Sep 26, 2007
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