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Fencer Intel
low 3.6

CVE-2012-6150 json

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 gr…

published 2013-12-03 12 y ago modified 2026-06-16 4 mo ago also EUVD-2012-6006

cvss
3.6
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.8%
EPSS 3.8% chance of exploitation in 30 days, percentile 90%
public exploits
0
none known

Summary

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.

Patch / fix

  • samba samba 3.4.0, 3.6.22, 4.0.13, 4.1.3
  • samba Debian 14, Debian 13, Debian 12 2:4.0.13+dfsg-1

debian advisories DEBIAN-CVE-2012-6150

  • samba Ubuntu 14.04 LTS 2:4.0.13+dfsg-1ubuntu1

ubuntu advisories UBUNTU-CVE-2012-6150

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • samba4 RHEL 6 4.0.0-61.el6_5.rc4
  • samba4-dc RHEL 6 4.0.0-61.el6_5.rc4
  • samba4-libs RHEL 6 4.0.0-61.el6_5.rc4
  • samba4-pidl RHEL 6 4.0.0-61.el6_5.rc4
  • samba4-swat RHEL 6 4.0.0-61.el6_5.rc4
  • samba4-test RHEL 6 4.0.0-61.el6_5.rc4
  • samba4-client RHEL 6 4.0.0-61.el6_5.rc4
  • samba4-common RHEL 6 4.0.0-61.el6_5.rc4

red hat advisories RHSA-2014:0383RHSA-2014:0330

  • samba openSUSE Tumbleweed 4.5.0-1.1

opensuse advisories openSUSE-SU-2024:10069-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2012-6150 updated cvss 2.9

samba: pam_winbind fails open when non-existent group specified to require_membership_of

  • Red Hat Enterprise Linux (v. 5 server) samba3x 3.6.6-0.139.el5_10, samba3x-swat 3.6.6-0.139.el5_10, samba3x-client 3.6.6-0.139.el5_10, samba3x-common 3.6.6-0.139.el5_10, samba3x-winbind 3.6.6-0.139.el5_10, samba3x-domainjoin-gui 3.6.6-0.139.el5_10 Red Hat Enterprise Linux Desktop (v. 5 client) samba3x 3.6.6-0.139.el5_10, samba3x-swat 3.6.6-0.139.el5_10, samba3x-client 3.6.6-0.139.el5_10, samba3x-common 3.6.6-0.139.el5_10, samba3x-winbind 3.6.6-0.139.el5_10, samba3x-domainjoin-gui 3.6.6-0.139.el5_10 Red Hat Enterprise Linux Desktop (v. 6) samba 3.6.9-168.el6_5, samba4 4.0.0-61.el6_5.rc4, libsmbclient 3.6.9-168.el6_5, samba-client 3.6.9-168.el6_5, samba-common 3.6.9-168.el6_5, samba4-dc 4.0.0-61.el6_5.rc4, +13 more Red Hat Enterprise Linux Desktop Optional (v. 6) samba 3.6.9-168.el6_5, samba-swat 3.6.9-168.el6_5, samba-domainjoin-gui 3.6.9-168.el6_5, samba-winbind-krb5-locator 3.6.9-168.el6_5 Red Hat Enterprise Linux Desktop Workstation (v. 5 client) samba3x 3.6.6-0.139.el5_10 Red Hat Enterprise Linux HPC Node (v. 6) samba 3.6.9-168.el6_5, samba4 4.0.0-61.el6_5.rc4, samba-client 3.6.9-168.el6_5, samba-common 3.6.9-168.el6_5, samba4-dc 4.0.0-61.el6_5.rc4, samba-winbind 3.6.9-168.el6_5, +12 more
    +5 more products
    Red Hat Enterprise Linux HPC Node Optional (v. 6) samba 3.6.9-168.el6_5, samba-swat 3.6.9-168.el6_5, libsmbclient 3.6.9-168.el6_5, samba-domainjoin-gui 3.6.9-168.el6_5, samba-winbind-krb5-locator 3.6.9-168.el6_5 Red Hat Enterprise Linux Server (v. 6) samba 3.6.9-168.el6_5, samba4 4.0.0-61.el6_5.rc4, libsmbclient 3.6.9-168.el6_5, samba-client 3.6.9-168.el6_5, samba-common 3.6.9-168.el6_5, samba4-dc 4.0.0-61.el6_5.rc4, +13 more Red Hat Enterprise Linux Server Optional (v. 6) samba 3.6.9-168.el6_5, samba-swat 3.6.9-168.el6_5, samba-domainjoin-gui 3.6.9-168.el6_5, samba-winbind-krb5-locator 3.6.9-168.el6_5 Red Hat Enterprise Linux Workstation (v. 6) samba 3.6.9-168.el6_5, samba4 4.0.0-61.el6_5.rc4, libsmbclient 3.6.9-168.el6_5, samba-client 3.6.9-168.el6_5, samba-common 3.6.9-168.el6_5, samba4-dc 4.0.0-61.el6_5.rc4, +13 more Red Hat Enterprise Linux Workstation Optional (v. 6) samba 3.6.9-168.el6_5, samba-swat 3.6.9-168.el6_5, samba-domainjoin-gui 3.6.9-168.el6_5, samba-winbind-krb5-locator 3.6.9-168.el6_5
    fixed: vendor fix RHSA-2014:0330
  • Red Hat Enterprise Linux 5 samba Red Hat Enterprise Linux 7 ctdb, samba, samba-dc, ctdb-tests, samba-libs, samba-pidl, +18 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.79% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • lists.samba.org https://lists.samba.org/archive/samba-technical/2012-June/084593.html referenced PoC, tagged "exploit" by a source, unverified
  • lists.samba.org https://lists.samba.org/archive/samba-technical/2013-November/096411.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 3.6 AV:N/AC:H/Au:S/C:P/I:P/A:N

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.