Permissions, Privileges, and Access Controls in Samba

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU32799

Risk: Low

CVSSv3.1: 3 [CVSS:3.1/CVSS:3.1/AV:N/AC:L/PR:/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

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

External links

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

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote 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.