Description
The Kerberos 5 (aka krb5) PAM module in Apple OS X before 10.12 does not use constant-time operations for determining username validity, which makes it easier for remote attackers to enumerate user accounts via a timing side-channel attack.
References
- 1036858 vdb-entry
- APPLE-SA-2016-09-20 vendor-advisory
- 93055 vdb-entry
- https://support.apple.com/HT207170