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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

1 year ago

Modified

Modified

1 year 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.

Common Vulnerabilities and Exposures (CVE)