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TITLE:
Samba Information Disclosure and Denial of Service

SECUNIA ADVISORY ID:
SA36893

VERIFY ADVISORY:
http://secunia.com/advisories/36893/

DESCRIPTION:
Some weaknesses and a vulnerability have been reported in Samba,
which can be exploited by malicious, local users to disclose
potentially sensitive information, and by malicious users to disclose
sensitive information and cause a DoS (Denial of Service).

1) The mount.cifs application does not properly verify if opening a
credentials file crosses the privileges of the invoking user. This
can be exploited to disclose partial file contents by using the
"--verbose" or "-v" option and passing the file as credentials file
to mount.cifs.

Successful exploitation requires that mount.cifs is suid root.

2) An infinite loop exists when processing certain SMB requests. This
can be exploited to cause a DoS due to CPU consumption by sending a
specially crafted request to the Samba server.

Successful exploitation requires that the attacker is authenticated.

3) Samba does not properly handle /etc/passwd entries with empty home
directories, which can lead to access to the root file system and all
subdirectories.

Successful exploitation requires that an /etc/passwd entry with an
empty home directory exists and automated "[homes]" sharing is
enabled or a share with the username of the affected entry exists.

SOLUTION:
Update to Samba version 3.0.37, 3.2.15, 3.3.8, or 3.4.2.
http://samba.org/samba/download/

Patches are also available:
http://www.samba.org/samba/history/security.html

PROVIDED AND/OR DISCOVERED BY:
1) The vendor credits Ronald Volgers.
2) The vendor credits Tim Prouty, Isilon and Samba Team
3) The vendor credits J. David Hester, LCG Systems National
Institutes of Health

ORIGINAL ADVISORY:
1) http://www.samba.org/samba/security/CVE-2009-2948.html
2) http://www.samba.org/samba/security/CVE-2009-2906.html
3) http://www.samba.org/samba/security/CVE-2009-2813.html

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