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Secunia Research: RhinoSoft Serv-U TEA Decoding Buffer Overflow

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                     Secunia Research 18/11/2009

         - RhinoSoft Serv-U TEA Decoding Buffer Overflow -

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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 

* RhinoSoft Serv-U 9.0.0.5

NOTE: Other versions may also be affected.

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2) Severity 

Rating: Highly critical
Impact: System compromise
Where:  Remote

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3) Vendor's Description of Software 

"Serv-U FTP Server is now offers an all-in-one file server solution 
featuring a built in web transfer client, web based adminstration, 
improved interface and more while still offering unparalleled security
and ease-of-use at the best price on the market.".

Product Link:
http://www.serv-u.com/

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4) Description of Vulnerability

Secunia Research has discovered a vulnerability in Serv-U, which can 
be exploited by malicious people to potentially compromise a 
vulnerable system.

The vulnerability is caused by a boundary error in a function when 
processing a hexadecimal representation of a string using a TEA 
decoding algorithm. This can be exploited to cause a stack-based 
buffer overflow by passing an overly long string.

Successful exploitation may allow execution of arbitrary code.

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5) Solution 

Update to version 9.1.0.0.

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6) Time Table 

05/11/2009 - Vendor notified.
05/11/2009 - Vendor response.
17/11/2009 - Fixed version released by the vendor.
18/11/2009 - Public disclosure.

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7) Credits 

Discovered by Secunia Research.

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8) References

The Common Vulnerabilities and Exposures (CVE) project has currently
not assigned a CVE identifier 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://secunia.com/advisories/business_solutions/

Secunia also provides a publicly accessible and comprehensive advisory
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http://secunia.com/advisories/

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://secunia.com/secunia_research/

Secunia regularly hires new skilled team members. Check the URL below
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Secunia offers a FREE mailing list called Secunia Security Advisories:

http://secunia.com/advisories/mailing_lists/

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10) Verification 

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2009-46/

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

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