A vulnerability has been reported in Linux-PAM, which can be exploited by malicious people to bypass certain security restrictions.
The vulnerability is caused due to an error within the "_unix_verify_password()" function in modules/pam_unix/support.c when verifying a user's password. This can be exploited to login with any given password if the hash in the passwd file is "!!" or similar.
The vulnerability is reported in version 0.99.7.0.
Solution: Update to version 0.99.7.1.
Provided and/or discovered by: Bernardo Innocenti
Original Advisory: https://www.redhat.com/archives/pam-list/2007-January/msg00017.html
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