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Title: Cisco Catalyst Memory Leak Denial of Service Vulnerability

Severity: LOW

Description:

Cisco Catalyst is a high speed switch implemented in local area networks.

The telnet server that is built into the Catalyst firmware for remote administration contains a memory leak vulnerability that can result in a denial of service. Each time that the telnet service started, memory resources are used without being freed afterwards. As a result, memory can be depleted by connecting multiple clients to the Catalyst telnet server leaving the device unable to function properly.

This can lead to a denial of service of network services dependent on the Catalyst until the device is manually reset.

Affected Products:

• Cisco Catalyst 4000 4.5.0(2)
• Cisco Catalyst 4000 4.5.0(3)
• Cisco Catalyst 4000 4.5.0(4)
• Cisco Catalyst 4000 4.5.0(5)
• Cisco Catalyst 4000 4.5.0(6)
• Cisco Catalyst 4000 4.5.0(7)
• Cisco Catalyst 4000 4.5.0(8)
• Cisco Catalyst 4000 4.5.0(9)
• Cisco Catalyst 4000 5.1.0
• Cisco Catalyst 4000 5.1.0(1)
• Cisco Catalyst 4000 5.1.0(1a)
• Cisco Catalyst 4000 5.1.0(2a)
• Cisco Catalyst 4000 5.2.0
• Cisco Catalyst 4000 5.2.0(1)
• Cisco Catalyst 4000 5.2.0(1a)
• Cisco Catalyst 4000 5.2.0(2)
• Cisco Catalyst 4000 5.2.0(4)
• Cisco Catalyst 4000 5.2.0(5)
• Cisco Catalyst 4000 5.2.0(6)
• Cisco Catalyst 4000 5.2.0(7)
• Cisco Catalyst 4000 5.4.0
• Cisco Catalyst 4000 5.4.0(1)
• Cisco Catalyst 4000 5.4.0(2)
• Cisco Catalyst 4000 5.4.0(3)
• Cisco Catalyst 4000 5.5.0
• Cisco Catalyst 4000 5.5.0(1)
• Cisco Catalyst 5000 4.5.0(2)
• Cisco Catalyst 5000 4.5.0(3)
• Cisco Catalyst 5000 4.5.0(4)
• Cisco Catalyst 5000 4.5.0(5)
• Cisco Catalyst 5000 4.5.0(6)
• Cisco Catalyst 5000 4.5.0(7)
• Cisco Catalyst 5000 4.5.0(8)
• Cisco Catalyst 5000 4.5.0(9)
• Cisco Catalyst 5000 5.1.0
• Cisco Catalyst 5000 5.1.0(1)
• Cisco Catalyst 5000 5.1.0(2a)
• Cisco Catalyst 5000 5.2.0
• Cisco Catalyst 5000 5.2.0(1)
• Cisco Catalyst 5000 5.2.0(2)
• Cisco Catalyst 5000 5.2.0(3)
• Cisco Catalyst 5000 5.2.0(4)
• Cisco Catalyst 5000 5.4.0(1)
• Cisco Catalyst 5000 5.4.0(2)
• Cisco Catalyst 5000 5.4.0(4)
• Cisco Catalyst 5000 5.4.1
• Cisco Catalyst 5000 5.5.0(1)
• Cisco Catalyst 5000 5.5.0(2)
• Cisco Catalyst 5000 5.5.0(3)
• Cisco Catalyst 5000 5.5.0(4)
• Cisco Catalyst 6000 5.3.0(1)CSX
• Cisco Catalyst 6000 5.3.0(1a)CSX
• Cisco Catalyst 6000 5.3.0(2)CSX
• Cisco Catalyst 6000 5.3.0(3)CSX
• Cisco Catalyst 6000 5.3.0(4)CSX
• Cisco Catalyst 6000 5.3.0(5)CSX
• Cisco Catalyst 6000 5.3.0(5a)CSX
• Cisco Catalyst 6000 5.3.0(6)CSX
• Cisco Catalyst 6000 5.4.0
• Cisco Catalyst 6000 5.4.0(1)
• Cisco Catalyst 6000 5.4.0(2)
• Cisco Catalyst 6000 5.4.0(3)
• Cisco Catalyst 6000 5.4.0(4)
• Cisco Catalyst 6000 5.5.0
• Cisco Catalyst 6000 5.5.0(1)
• Cisco Catalyst 6000 5.5.0(2)
• Cisco Catalyst 6000 5.5.0(3)
• Cisco Catalyst 6000 5.5.0(4)
• Cisco Catalyst 6000 5.5.0(4a)

References:

• Cisco: Cisco Security Advisory: Cisco Catalyst Memory Leak Vulnerability
• Cisco Systems: Cisco Product Security Incident Response

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