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Cisco IOS Software Virtual PPP Interfaces Security Bypass Vulnerability
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
A vulnerability in Cisco devices that are running Cisco IOS Software Release 15.2(04)M or Cisco IOS Software Release 15.4(03)M and are configured to use access control lists (ACLs) could allow a user who is connected to an authenticated PPP session to bypass ACLs that are configured on virtual PPP interfaces, if the ACL on the physical interface permits the traffic to pass. The vulnerability is due to the physical interface ignoring virtual PPP ACLs. An attacker could exploit this vulnerability to bypass virtual PPP ACLs and pass denied traffic across virtual PPP interfaces. A successful exploit could allow the attacker to pass traffic as if the ACLs do not exist. Cisco has released software updates that address this vulnerability. Workarounds that mitigate this vulnerability are not available.
Detection Method
Detection Method
Checks if a vulnerable version is present on the target host.
Solution
Solution
See the referenced vendor advisory for a solution.