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Secunia Research: Free Download Manager Torrent Parsing Buffer Overflows

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                     Secunia Research 02/02/2009

     - Free Download Manager Torrent Parsing Buffer Overflows -

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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 some vulnerabilities in Free Download
Manager, which can be exploited by malicious people to compromise a 
user's system.

1) A boundary error in the parsing of file names inside torrent files
can be exploited to cause a heap-based buffer overflow via an overly 
long file name.

2) Two boundary errors when parsing names from torrent files can be 
exploited to cause stack-based buffer overflows via overly long file
names.

3) A boundary error when parsing tracker URLs from torrent files can 
be exploited to cause a stack-based buffer overflow via an overly 
long tracker URL.

4) A boundary error when parsing comments from torrent files can be
exploited to cause a stack-based buffer overflow via an overly long 
comment.

Successful exploitation of the vulnerabilities allows execution of 
arbitrary code by e.g. tricking a user into opening a specially 
crafted torrent file.

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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 all vulnerabilities have not been 
             properly fixed.
30/01/2009 - New fixed version provided by the vendor.
30/01/2009 - Vendor informed that all vulnerabilities are 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-2009-0184 for the vulnerabilities.

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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/2009-5/

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

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