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TITLE:
Samba Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA25232

VERIFY ADVISORY:
http://secunia.com/advisories/25232/

CRITICAL:
Moderately critical

IMPACT:
Privilege escalation, System access

WHERE:
>From local network

SOFTWARE:
Samba 3.x
http://secunia.com/product/2999/

DESCRIPTION:
Some vulnerabilities have been reported in Samba, which can be
exploited by malicious users to perform certain actions with
escalated privileges and to compromise a vulnerable system, and by
malicious people to compromise a vulnerable system.

1) An error in smbd when translating SIDs to and from names can be
exploited to issue SMB/CIFS protocol operations as the root user.

Successful exploitation requires a valid user session.

2) Errors in NDR parsing can be exploited to cause heap based buffer
overflows via specially crafted MS-RPC requests.

Successful exploitation allows execution of arbitrary code, but
requires a valid user session.

3) An input validation error when updating a user's password can be
exploited to inject and execute arbitrary shell commands via a
specially crafted MS-RPC call.

Successful exploitation of this vulnerability requires that the
"username map script" option is set in smb.conf, which is not the
default setting. In addition, to successfully exploit this
vulnerability via remote printer and file share management, an
attacker requires a valid user session.

Vulnerability #1 is reported in versions 3.0.23d through 3.0.25pre2.
Vulnerabilities #2 and #3 are reported in versions 3.0.0 through
3.0.25rc3.

SOLUTION:
Apply patches or update to version 3.0.25.

Patches:
http://www.samba.org/samba/security/

Samba 3.0.25:
http://us1.samba.org/samba/download/

PROVIDED AND/OR DISCOVERED BY:
1) The vendor credits Paul Griffith and Andrew Hogue.
2) Discovered by an anonymous person and reported via ZDI.
3) Discovered by an anonymous person and reported via iDefense Labs.

ORIGINAL ADVISORY:
Samba:
http://us1.samba.org/samba/security/CVE-2007-2444.html
http://us1.samba.org/samba/security/CVE-2007-2446.html
http://us1.samba.org/samba/security/CVE-2007-2447.html

iDefense Labs:
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=534

OTHER REFERENCES:
US-CERT VU#268336:
http://www.kb.cert.org/vuls/id/268336

US-CERT VU#773720:
http://www.kb.cert.org/vuls/id/773720

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