A vulnerability has been identified in Linux-PAM, which allows malicious, local users to escalate their privileges.
The problem exists if PAM has been configured with "pam_wheel" to allow trusted users to become root without supplying the root password. Furthermore, the "trust" option has to be enabled and the "use_uid" option disabled.
Creating a "link" to the "tty" of a wheel user and starting "bash" so that it reads this "tty" allows malicious users to bypass the verification and escalate their privileges.
Solution: Reportedly, a patch has been released, which ensures better verification of the user.
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Subject: Linux-PAM User Name Spoofing Vulnerability
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