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TITLE:
Evolution iCalendar Two Buffer Overflow Vulnerabilities

SECUNIA ADVISORY ID:
SA30298

VERIFY ADVISORY:
http://secunia.com/advisories/30298/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
GNOME Evolution 2.x
http://secunia.com/product/5525/
Novell Evolution 2.x
http://secunia.com/product/4558/

DESCRIPTION:
Secunia Research has discovered two vulnerabilities in Evolution,
which can be exploited by malicious people to compromise a user's
system.

1) A boundary error exists 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.

2) A boundary error exists when replying to an iCalendar request
while in calendar view. This can be exploited to cause a heap-based
buffer overflow via an overly long "DESCRIPTION" property included in
an iCalendar attachment.

Successful exploitation allows execution of arbitrary code, but
requires that the user accepts the iCalendar request and replies to
it from the "Calendars" window.

The vulnerabilities are confirmed in version 2.22.1. Other versions
may also be affected.

SOLUTION:
Do not select untrusted e-mail messages.

Various Linux vendors will issue patched versions soon.

PROVIDED AND/OR DISCOVERED BY:
Alin Rad Pop, Secunia Research

ORIGINAL ADVISORY:
Secunia Research:
http://secunia.com/secunia_research/2008-22/
http://secunia.com/secunia_research/2008-23/

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
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Definitions: (Criticality, Where etc.)
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Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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