Secunia Research Advisory

Samba "receive_smb_raw()" Buffer Overflow Vulnerability


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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:

https://www.flexera.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.

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.

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

https://www.flexera.com/company/careers

Secunia offers a FREE mailing list called Secunia Security Advisories:

https://www.flexera.com/secunia_security_advisories/ 

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10) Verification 

Please verify this advisory by visiting the Secunia website:
https://www.flexera.com/about-us/secunia-research/advisories/sr-2008-20.html

Complete list of vulnerability reports published by Secunia Research:
https://www.flexera.com/about-us/secunia-research/advisories/

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