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Advisories

Kyverno before 1.19.2 Cosign Identity Check Bypass via Empty SAN Certificates

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Severity
high
Date
Affecting

  • kyverno >= 0, < 1.19.2

CWE
  • CWE-295 Improper Certificate Validation
CVSS
7.2
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:H/VA:L/SC:L/SI:H/SA:L
Credit
arpitjain099
Description
Kyverno before 1.19.2 contains an authentication bypass in matchCertificateData that skips verifyImages subject and subjectRegExp checks when the signing certificate has no Subject Alternative Name. Attackers holding a leaf certificate from a configured private trust root can omit the SAN, set the expected Fulcio issuer OID, and sign malicious images that are admitted despite signer pinning.

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