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                     Secunia Research 21/03/2007

   - Evolution Shared Memo Categories 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 

Evolution 2.8.2.1

NOTE: Other versions may also be affected.

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2) Severity 

Rating: Moderately Critical
Impact: System access
        DoS
Where:  Remote

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3) Vendor's Description of Software 

"Evolution provides integrated mail, addressbook and calendaring
functionality to users of the GNOME desktop."

Product Link:
http://www.gnome.org/projects/evolution/

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4) Description of Vulnerability

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

A format string error in the "write_html()" function in calendar/gui/
e-cal-component-memo-preview.c when displaying a memo's categories 
can potentially be exploited to execute arbitrary code via a specially
crafted shared memo containing format specifiers.

Successful exploitation requires that the user opens a shared memo in
their mailbox, clicks on "Accept", and views the memo under the "Memo"
tab.

NOTE: The categories are not displayed in the mailbox view of a shared
memo.

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5) Solution 

Do not open untrusted shared memos.

Various Linux vendors will issue patched versions soon.

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6) Time Table 

01/03/2007 - Vendor notified (Red Hat and the vendor-sec list).
03/03/2007 - Vendor response.
21/03/2007 - 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-2007-1002 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/2007-44/

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

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