CVE-2012-6150: Canonical Ubuntu Linux

Low severity, CVSS 3.6. EPSS: 3.8% chance of exploitation in the next 30 days.

The winbind_name_list_to_sid_string_list function in nsswitch/pam_winbind.c in Samba through 4.1.2 handles invalid require_membership_of group names by accepting authentication by any user, which allows remote authenticated users to bypass intended access restrictions in opportunistic circumstances by leveraging an administrator's pam_winbind configuration-file mistake.

Affected products

• Canonical Ubuntu Linux: version 10.04 only; version 12.04 only; version 12.10 only; version 13.04 only; version 13.10 only
• Samba Samba: from 3.3.10, before 3.4.0 (fixed in 3.4.0); from 3.4.3, before 3.6.22 (fixed in 3.6.22); from 4.0.0, before 4.0.13 (fixed in 4.0.13); from 4.1.0, before 4.1.3 (fixed in 4.1.3)

Published 2013-12-03. Last modified 2026-06-16.