X.509 Basic Constraints cA Spoofing Vulnerability

CVE-2015-1793 · MEDIUM Severity

AV:N/AC:L/AU:N/C:P/I:P/A:N

The X509_verify_cert function in crypto/x509/x509_vfy.c in OpenSSL 1.0.1n, 1.0.1o, 1.0.2b, and 1.0.2c does not properly process X.509 Basic Constraints cA values during identification of alternative certificate chains, which allows remote attackers to spoof a Certification Authority role and trigger unintended certificate verifications via a valid leaf certificate.

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