[SA23858] Linux-PAM Login Bypass Security Vulnerability

TITLE:
Linux-PAM Login Bypass Security Vulnerability

SECUNIA ADVISORY ID:
SA23858

VERIFY ADVISORY:
http://secunia.com/advisories/23858/

CRITICAL:
Moderately critical

IMPACT:
Security Bypass

WHERE:
>From remote

SOFTWARE:
Linux-PAM 0.x
http://secunia.com/product/1701/

DESCRIPTION:
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
http://www.redhat.com/archives/fedora-devel-list/2007-January/msg01277.html

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