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imlib2 PNM and XPM Buffer Overflow



Secunia Research: imlib2 PNM and XPM Buffer Overflow
Secunia Research: imlib2 PNM and XPM Buffer Overflow



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                     Secunia Research 29/05/2008

               - imlib2 PNM and XPM 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 

* imlib2 1.4.0

NOTE: Other versions may also be affected.

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2) Severity 

Rating: Highly critical
Impact: System access
Where:  Remote

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3) Vendor's Description of Software 

"Imlib 2 is the successor to Imlib. It is NOT a newer version -- it
is a completely new library. Imlib 2 can be installed alongside
Imlib 1.x without any problems since they are effectively different
libraries which have very similar functionality."

Product Link:
http://enlightenment.org 

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4) Description of Vulnerability

Secunia Research has discovered two vulnerabilities in imlib2, which
can be exploited by malicious people to cause a DoS (Denial of
Service) or compromise an application using the library.

1) A boundary error exists within the "load()" function in
src/modules/loaders/loader_pnm.c when processing the header of a
PNM image file. This can be exploited to cause a stack-based buffer
overflow by e.g. tricking a user into opening a specially crafted
PNM image in an application using the imlib2 library.

Successful exploitation allows execution of arbitrary code.

2) A boundary error exists within the "load()" function in
src/modules/loader_xpm.c when processing an XPM image file. This can
be exploited to cause a stack-based buffer overflow by e.g. tricking
a user into opening a specially crafted XPM image with an application
using the imlib2 library.

Successful exploitation may allow execution of arbitrary code.

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5) Solution 

Fixed in the CVS repository.

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6) Time Table 

27/05/2008 - Vendor notified.
27/05/2008 - Vendor response.
29/05/2008 - Public disclosure.

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7) Credits 

Discovered by Stefan Cornelius, Secunia Research.

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8) References

The Common Vulnerabilities and Exposures (CVE) project has assigned 
CVE-2008-2426 for these 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://corporate.secunia.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.

http://secunia.com/ 

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://corporate.secunia.com/secunia_research/33/ 

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

http://secunia.com/secunia_vacancies/ 

Secunia offers a FREE mailing list called Secunia Security Advisories:

http://secunia.com/secunia_security_advisories/ 

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10) Verification 

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2008-25/ 

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

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