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Squid Certificate Validation Vulnerability (SQUID-2021:6, GHSA-47m4-g3mv-9q5r)
Information
Severity
Severity
Critical
Family
Family
Denial of Service
CVSSv2 Base
CVSSv2 Base
9.4
CVSSv2 Vector
CVSSv2 Vector
AV:N/AC:L/Au:N/C:C/I:C/A:N
Solution Type
Solution Type
Vendor Patch
Created
Created
2 years ago
Modified
Modified
2 years ago
Summary
Squid is prone to a certificate validation vulnerability.
Insight
Insight
When validating an origin server or peer certificate, Squid may incorrectly classify certain certificates as trusted. This problem is guaranteed to occur when multiple CA have signed the TLS server certificate. It may also occur in cases of broken server certificate chains.
Affected Software
Affected Software
Squid version 5.0.6 through 5.1.
Detection Method
Detection Method
Checks if a vulnerable version is present on the target host.
Solution
Solution
Update to version 5.2 or later.