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                     Secunia Research 02/02/2009

   - Free Download Manager Remote Control Server 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 

* Free Download Manager 2.5 Build 758
* Free Download Manager 3.0 Build 844

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 

"What is Free Download Manager? It is a powerful, easy-to-use and
absolutely free download accelerator and manager. Moreover, FDM is 
100% safe, open-source software distributed under GPL license.".

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

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4) Description of Vulnerability

Secunia Research has discovered a vulnerability in Free Download
Manager, which can be exploited by malicious people to compromise a 
user's system.

The vulnerability is caused due to a boundary error in the Remote
Control Server when processing "Authorization" headers in HTTP
requests. This can be exploited to cause a stack-based buffer overflow
via an HTTP request containing an overly long "Authorization" header.

Successful exploitation allows execution of arbitrary code.

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5) Solution 

Update to version 3.0 build 848.

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6) Time Table 

20/01/2009 - Form submitted on the vendor's website asking for e-mail
             address of security contact.
27/01/2009 - E-mail sent to various e-mail addresses asking for 
             contact information of security contact.
27/01/2009 - Vendor response (e-mail address of security contact 
             provided).
28/01/2009 - Vulnerability details sent to the vendor.
28/01/2009 - Fixed version provided for testing by the vendor.
28/01/2009 - Vendor informed that vulnerability is fixed.
31/01/2009 - Vendor issues fixed version.
02/02/2009 - Public disclosure.

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7) Credits 

Discovered by Carsten Eiram, Secunia Research.

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8) References

The Common Vulnerabilities and Exposures (CVE) project has assigned 
CVE-2009-0183 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
database as a service to the security community and private 
individuals, who are interested in or concerned about IT-security.

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
to see currently vacant positions:

http://secunia.com/corporate/jobs/

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/2009-3/

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

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