Description
The X.509 certificate-trust implementation in Apple iOS before 9.1 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.
References
- APPLE-SA-2015-10-21-1 vendor-advisory
- APPLE-SA-2015-12-08-4 vendor-advisory
- https://support.apple.com/HT205370
- https://support.apple.com/HT205641
- 1033929 vdb-entry
- 77268 vdb-entry