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TITLE:
Samba "send_mailslot()" Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA27760

VERIFY ADVISORY:
http://secunia.com/advisories/27760/

CRITICAL:
Moderately critical

IMPACT:
System access

WHERE:
>From local network

REVISION:
2.0 originally posted 2007-12-10

SOFTWARE:
Samba 3.x
http://secunia.com/product/2999/
Samba 2.x
http://secunia.com/product/1271/

DESCRIPTION:
Secunia Research has discovered a vulnerability in Samba, which can
be exploited by malicious people to compromise a vulnerable system.

The vulnerability is caused due to a boundary error within the
"send_mailslot()" function. This can be exploited to cause a
stack-based buffer overflow with zero bytes via a specially crafted
"SAMLOGON" domain logon packet containing a username string placed at
an odd offset followed by an overly long GETDC string.

Successful exploitation allows execution of arbitrary code, but
requires that the "domain logons" option is enabled.

The vulnerability is confirmed in version 3.0.27a. Prior versions may
also be affected.

SOLUTION:
Update to version 3.0.28 or apply patch.

Patch for Samba 3.0.27a:
http://us3.samba.org/samba/ftp/patches/security/samba-3.0.27a-CVE-2007-6015.patch

PROVIDED AND/OR DISCOVERED BY:
Alin Rad Pop, Secunia Research.

CHANGELOG:
2007-12-10: Updated "Solution" section.

ORIGINAL ADVISORY:
Secunia Research:
http://secunia.com/secunia_research/2007-99/

Samba:
http://us3.samba.org/samba/security/CVE-2007-6015.html

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

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Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
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use those supplied by the vendor.

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