#VU33302 Input validation error in Samba - CVE-2012-6150

Vulnerability identifier: #VU33302

Vulnerability risk: Low

CVSSv4.0: 0.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2012-6150

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Samba
Server applications / Directory software, identity management

Vendor: Samba

Description

The vulnerability allows a remote #AU# to read and manipulate data.

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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Samba: 4.1.0 - 4.1.2

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External links
https://lists.fedoraproject.org/pipermail/package-announce/2014-August/136864.html
https://lists.fedoraproject.org/pipermail/package-announce/2014-June/134717.html
https://lists.opensuse.org/opensuse-security-announce/2014-01/msg00002.html
https://lists.opensuse.org/opensuse-security-announce/2016-04/msg00047.html
https://lists.opensuse.org/opensuse-security-announce/2016-04/msg00048.html
https://lists.opensuse.org/opensuse-updates/2013-12/msg00088.html
https://lists.opensuse.org/opensuse-updates/2014-03/msg00063.html
https://marc.info/?l=bugtraq&m=141660010015249&w=2
https://openwall.com/lists/oss-security/2013/12/03/5
https://rhn.redhat.com/errata/RHSA-2014-0330.html
https://security.gentoo.org/glsa/glsa-201502-15.xml
https://www.mandriva.com/security/advisories?name=MDVSA-2013:299
https://www.ubuntu.com/usn/USN-2054-1
https://bugzilla.redhat.com/show_bug.cgi?id=1036897
https://bugzilla.samba.org/show_bug.cgi?id=10300
https://lists.samba.org/archive/samba-technical/2012-June/084593.html
https://lists.samba.org/archive/samba-technical/2013-November/096411.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.