Secunia Research Advisory

activePDF Server Packet Handling Buffer Overflow


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                     Secunia Research 27/02/2008

       - activePDF Server Packet Handling 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 

activePDF Server versions 3.8.4 and 3.8.5.14.

NOTE: Other versions may also be affected.

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2) Severity 

Rating: Moderately critical
Impact: System compromise
Where:  Local network

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3) Vendor's Description of Software 

"Use activePDF Server to provide integrated PDF generation and dynamic
PDF conversion from within your enterprise or web applications.".

Product Link:
http://www.activepdf.com/products/serverproducts/server/

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4) Description of Vulnerability

Secunia Research has discovered a vulnerability in activePDF Server,
which can be exploited by malicious people to compromise a vulnerable
system.

The vulnerability is caused due to a boundary error in the activePDF
Server service (APServer.exe) when receiving client data. This can be
exploited to cause a heap-based buffer overflow by connecting to the
service (port 53535/TCP by default) and sending a packet specifying a
smaller size than the actual size of the following data.

Successful exploitation may allow execution of arbitrary code.

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5) Solution 

Update to version 3.8.6.16 or later.

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6) Time Table 

30/10/2007 - Vendor notified.
08/11/2007 - Vendor notified (2nd attempt).
16/11/2007 - Vendor response.
27/02/2008 - 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-2007-5397 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-2007-87.html

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

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