Revocation-checking vulnerability in Apple OS X before 10.11

CVE-2015-5894 · MEDIUM Severity

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

The X.509 certificate-trust implementation in Apple OS X before 10.11 does not recognize that the kSecRevocationRequirePositiveResponse flag implies a revocation-checking requirement, which makes it easier for man-in-the-middle attackers to spoof endpoints by leveraging access to a revoked certificate.

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