Advisories

rustls-webpki before 0.103.10 CRL Revocation Check Bypass

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severity
medium
date
Affecting
  • webpki >= 0.102.0-alpha.0, < 0.103.10

  • webpki >= 0.104.0-alpha.1, < 0.104.0-alpha.5

CWE
  • CWE-299 Improper Check for Certificate Revocation
CVSS
5.9
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Credit
1seal
Description
rustls-webpki versions before 0.103.10 and 0.104.0-alpha.5 contain faulty CRL authority-matching logic that compares only the first distributionPoint against each CRL's IssuingDistributionPoint, ignoring additional distributionPoints. Attackers with a compromised trusted issuing authority can present revoked certificates that pass revocation checks under UnknownStatusPolicy::Allow, or cause incorrect errors under the default deny policy.

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