Permissions, Privileges, and Access Controls in Samba

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU32799

Risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2012-2111

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

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

The (1) CreateAccount, (2) OpenAccount, (3) AddAccountRights, and (4) RemoveAccountRights LSA RPC procedures in smbd in Samba 3.4.x before 3.4.17, 3.5.x before 3.5.15, and 3.6.x before 3.6.5 do not properly restrict modifications to the privileges database, which allows remote authenticated users to obtain the "take ownership" privilege via an LSA connection.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Samba: 3.4.0 - 3.4.16

CPE2.3

• cpe:2.3:a:samba:samba:3.4.0:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.4.1:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.4.2:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.4.3:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.4.4:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.4.5:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.4.6:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.4.7:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.4.8:*:*:*:*:*:*:*
• cpe:2.3:a:samba:samba:3.4.9:*:*:*:*:*:*:*

External links

https://lists.fedoraproject.org/pipermail/package-announce/2012-May/079662.html
https://lists.fedoraproject.org/pipermail/package-announce/2012-May/079670.html
https://lists.fedoraproject.org/pipermail/package-announce/2012-May/079677.html
https://lists.opensuse.org/opensuse-security-announce/2012-04/msg00023.html
https://lists.opensuse.org/opensuse-security-announce/2012-05/msg00001.html
https://lists.opensuse.org/opensuse-security-announce/2012-05/msg00003.html
https://marc.info/?l=bugtraq&m=134323086902585&w=2
https://osvdb.org/81648
https://rhn.redhat.com/errata/RHSA-2012-0533.html
https://secunia.com/advisories/48976
https://secunia.com/advisories/48984
https://secunia.com/advisories/48996
https://secunia.com/advisories/48999
https://secunia.com/advisories/49017
https://secunia.com/advisories/49030
https://www.collax.com/produkte/AllinOne-server-for-small-businesses#id2565578
https://www.debian.org/security/2012/dsa-2463
https://www.mandriva.com/security/advisories?name=MDVSA-2012:067
https://www.samba.org/samba/security/CVE-2012-2111
https://www.securitytracker.com/id?1026988
https://www.ubuntu.com/usn/USN-1434-1

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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