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                     Secunia Research 28/05/2008

     - Samba "receive_smb_raw()" 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 3.0.28a and 3.0.29.

NOTE: Prior versions may also be affected.

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2) Severity 

Rating: Highly critical
Impact: System access
Where:  From remote

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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 
"receive_smb_raw()" function in lib/util_sock.c when parsing SMB 
packets. This can be exploited to cause a heap-based buffer overflow 
via an overly large SMB packet received in a client context.

Successful exploitation allows execution of arbitrary code by tricking
a user into connecting to a malicious server (e.g. by clicking an 
"smb://" link) or by sending specially crafted packets to an "nmbd" 
server configured as a local or domain master browser.

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5) Solution 

Update to upcoming version 3.0.30 or apply patches.

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6) Time Table 

15/05/2008 - Vendor notified.
15/05/2008 - vendor-sec notified.
16/05/2008 - Vendor response.
28/05/2008 - Public disclosure.

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7) Credits 

Discovered by Alin Rad Pop, Secunia Research.

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8) References

The Common Vulnerabilities and Exposures (CVE) project has assigned
CVE-2008-1105 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/2008-20/ 

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

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