Samba "reply_netbios_packet()" Buffer Overflow Vulnerability

Advisory Text :

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Secunia Research 15/11/2007

- Samba "reply_netbios_packet()" Buffer Overflow Vulnerability -

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Table of Contents

Affected Software....................................................1
Severity.............................................................2
Vendor's Description of Software.....................................3
Description of Vulnerability.........................................4
Solution.............................................................5
Time Table...........................................................6
Credits..............................................................7
References...........................................................8
About Secunia........................................................9
Verification........................................................10

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1) Affected Software

* Samba 3.0.26a

NOTE: Other versions may also be affected.

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2) Severity

Rating: Moderately critical
Impact: System access
Where: Local network

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3) Vendor's Description of Software

"Samba is an Open Source/Free Software suite that has, since 1992,
provided file and print services to all manner of SMB/CIFS clients,
including the numerous versions of Microsoft Windows operating systems.
Samba is freely available under the GNU General Public License."

Product Link:
http://www.samba.org/

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4) Description of Vulnerability

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
"reply_netbios_packet()" function in nmbd/nmbd_packets.c when sending
NetBIOS replies. This can be exploited to cause a stack-based buffer
overflow by sending multiple specially crafted WINS "Name Registration"
requests followed by a WINS "Name Query" request.

Successful exploitation allows execution of arbitrary code, but
requires that Samba is configured to run as a WINS server (the "wins
support" option is enabled).

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5) Solution

Apply patch or update to version 3.0.27.

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6) Time Table

30/10/2007 - Vendor notified.
30/10/2007 - vendor-sec notified.
30/10/2007 - Vendor response.
15/11/2007 - Public disclosure.

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7) Credits

Discovered by Alin Rad Pop, Secunia Research.

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8) References

Samba:
http://us1.samba.org/samba/security/CVE-2007-4572.html

The Common Vulnerabilities and Exposures (CVE) project has assigned
CVE-2007-5398 for the vulnerability.

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9) About Secunia

Secunia offers vulnerability management solutions to corporate
customers with verified and reliable vulnerability intelligence
relevant to their specific system configuration:

http://corporate.secunia.com/

Secunia also provides a publicly accessible and comprehensive advisory
database as a service to the security community and private
individuals, who are interested in or concerned about IT-security.

http://secunia.com/

Secunia believes that it is important to support the community and to
do active vulnerability research in order to aid improving the
security and reliability of software in general:

http://corporate.secunia.com/secunia_research/33/

Secunia regularly hires new skilled team members. Check the URL below
to see currently vacant positions:

http://secunia.com/secunia_vacancies/

Secunia offers a FREE mailing list called Secunia Security Advisories:

http://secunia.com/secunia_security_advisories/

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10) Verification

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2007-90/

Complete list of vulnerability reports published by Secunia Research:
http://secunia.com/secunia_research/

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Samba "reply_netbios_packet()" Buffer Overflow Vulnerability