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Secunia Research: Sylpheed / Sylpheed-Claws POP3 Format String Vulnerability

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                     Secunia Research 24/08/2007

    - Sylpheed / Sylpheed-Claws POP3 Format String Vulnerability -

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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

* Sylpheed 2.4.4
* Sylpheed-Claws 1.9.100
* Sylpheed-Claws (Claws Mail) 2.10.0

NOTE: Other versions may also be affected.

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2) Severity

Rating: Moderately critical
Impact: System access
Where:  From remote

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3) Vendor's Description of Software

"Sylpheed is a simple, lightweight but featureful, and easy-to-use
e-mail client (mailer, MUA)."

Product Link:
http://sylpheed.sraoss.jp/en/

"Claws Mail is an email client (and news reader), based on GTK+,
featuring:
- Quick response
- Graceful, and sophisticated interface
- Easy configuration, intuitive operation
- Abundant features
- Extensibility
- Robustness and stability"

Product Link:
http://www.claws-mail.org/

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4) Description of Vulnerability

Secunia Research has discovered a vulnerability in Sylpheed and
Sylpheed-Claws (Claws Mail), which can be exploited by malicious 
people to compromise a vulnerable system.

A format string error in the "inc_put_error()" function in src/inc.c
when displaying a POP3 server's error response can be exploited via
specially crafted POP3 server replies containing format specifiers.

Successful exploitation may allow execution of arbitrary code, but
requires that the user is tricked into connecting to a malicious POP3
server.

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5) Solution

Fixed in the SVN and CVS repositories for Sylpheed 2.x and Claws Mail
2.x.

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6) Time Table

22/08/2007 - Vendor notified (Sylpheed, Claws Mail, vendor-sec list).
23/08/2007 - Vendor response. Both Sylpheed and Claws Mail have
             committed fixes to their respective SVN and CVS
             repositories.
24/08/2007 - Public disclosure.

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7) Credits

Discovered by Ulf Harnhammar, Secunia Research.

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8) References

The Common Vulnerabilities and Exposures (CVE) project has assigned
CVE-2007-2958 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://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/2007-70/

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

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