Secunia Research: Evolution iCalendar Timezone Buffer Overflow

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                     Secunia Research 04/06/2008

            - Evolution iCalendar Timezone 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

* Evolution 2.22.1

NOTE: Other versions may also be affected.

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2) Severity

Rating: Highly critical
Impact: System compromise
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 compromise a user's system.

The vulnerability is caused due to a boundary error when parsing
timezone strings contained within iCalendar attachments. This can be
exploited to overflow a static buffer via an overly long timezone
string.

Successful exploitation allows execution of arbitrary code, but
requires that the ITip Formatter plugin is disabled.

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5) Solution

Do not select untrusted e-mail messages.

Various Linux vendors will issue patched versions soon.

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6) Time Table

27/05/2008: vendor-sec notified.
27/05/2008: vendor-sec response.
04/06/2008: Public disclosure.

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7) Credits

Discovered by Alin Rad Pop, Secunia Research.

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8) References

The Common Vulnerabilities and Exposures (CVE) project has assigned
CVE-2008-1108 for the vulnerability.

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9) About Secunia

Secunia offers vulnerability management solutions to corporate
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Secunia also provides a publicly accessible and comprehensive advisory
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10) Verification

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2008-22/

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

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