Secunia Research: Evolution Shared Memo Categories Format String Vulnerability

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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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