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computer vulnerability bulletin CVE-2012-6150

Samba pam_winbind: privilege escalation via require_membership_of

Synthesis of the vulnerability

When pam_winbind is configured with require_membership_of indicating an invalid group, an attacker who has a domain account can authenticate locally.
Impacted software: Fedora, HP-UX, openSUSE, Solaris, RHEL, Samba, SUSE Linux Enterprise Desktop, SLES.
Severity of this computer vulnerability: 2/4.
Consequences of a hack: privileged access/rights, user access/rights.
Attacker's origin: user account.
Creation date: 03/12/2013.
Références of this announce: BID-64101, c04396638, CERTA-2013-AVI-658, CERTFR-2014-AVI-112, CERTFR-2014-AVI-244, CVE-2012-6150, FEDORA-2013-23085, FEDORA-2013-23177, HPSBUX03087, MDVSA-2013:299, openSUSE-SU-2013:1742-1, openSUSE-SU-2013:1921-1, openSUSE-SU-2014:0405-1, openSUSE-SU-2016:1106-1, openSUSE-SU-2016:1107-1, openSUSE-SU-2016:1108-1, RHSA-2014:0330-01, RHSA-2014:0383-01, SSRT101413, SUSE-SU-2014:0024-1, VIGILANCE-VUL-13858.

Description of the vulnerability

The pam_winbind module is provided by Samba. It is used to authenticate a user on a domain.

The "require_membership_of" configuration directive requires users to be member of a group to allow the access. However, if the indicated group name does not exist, the access is allowed.

When pam_winbind is configured with require_membership_of indicating an invalid group, an attacker who has a domain account can therefore authenticate locally.
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