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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

5 years ago

Modified

Modified

3 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.

Common Vulnerabilities and Exposures (CVE)