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Cisco IOS Software SSH X.509 Authentication Bypass Vulnerability
Information
Severity
Severity
Medium
Family
Family
CISCO
CVSSv2 Base
CVSSv2 Base
5.8
CVSSv2 Vector
CVSSv2 Vector
AV:N/AC:M/Au:N/C:P/I:P/A:N
Solution Type
Solution Type
Vendor Patch
Created
Created
7 years ago
Modified
Modified
5 years ago
Summary
A vulnerability in the implementation of X.509 Version 3 for SSH authentication functionality in Cisco IOS Software could allow an unauthenticated, remote attacker to bypass authentication on an affected system.
Insight
Insight
The vulnerability is due to improper validation of X.509 signatures during the SSH authentication phase. An attacker could exploit this vulnerability by presenting an invalid X.509 signature to an affected system.
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.