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TITLE:
Samba Security Bypass and Format String Vulnerabilities

SECUNIA ADVISORY ID:
SA35539

VERIFY ADVISORY:
http://secunia.com/advisories/35539/

DESCRIPTION:
Two vulnerabilities have been reported in Samba, which can be
exploited by malicious users to bypass certain security restrictions
and by malicious people to potentially compromise a user's system.

1) An uninitialised memory access error exists in smbd when denying
attempts to modify a restricted access control list (ACL). This can
be exploited to potentially modify the ACL of an already writable
file without required permissions.

Successful exploitation requires that "dos filemode" is set to "yes"
in smb.conf.

The vulnerability is reported in versions 3.0.31 through 3.3.5.

2) A format string error exists in the "smbclient" utility when
processing file names received as command arguments. This can be
exploited to potentially execute arbitrary code by tricking a user
into e.g. issuing a "put" command having a malicious file name
argument in "smbclient".

The vulnerability is reported in versions 3.2.0 through 3.2.12.

SOLUTION:
Update to version 3.0.35, 3.2.13, or 3.3.6.

Patches are also available:

Samba 3.3.5:
http://us1.samba.org/samba/ftp/patches/security/samba-3.3.5-CVE-2009-1888.patch

Samba 3.2.12:
http://us1.samba.org/samba/ftp/patches/security/samba-3.2.12-CVE-2009-1888.patch
http://us1.samba.org/samba/ftp/patches/security/samba-3.2.12-CVE-2009-1886.patch

Samba 3.0.34:
http://us1.samba.org/samba/ftp/patches/security/samba-3.0.34-CVE-2009-1888.patch

PROVIDED AND/OR DISCOVERED BY:
1) Jeremy Allison
2) The vendor credits Reinhard Nissl.

ORIGINAL ADVISORY:
http://us1.samba.org/samba/security/CVE-2009-1886.html
http://us1.samba.org/samba/security/CVE-2009-1888.html

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