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TITLE:
Asterisk Voicemail IMAP Backend Invalid MIME Denial of Service

SECUNIA ADVISORY ID:
SA26601

VERIFY ADVISORY:
http://secunia.com/advisories/26601/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
Asterisk 1.x
http://secunia.com/product/2155/

DESCRIPTION:
A vulnerability has been reported in Asterisk, which can be exploited
by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to an error when handling emails with
a malformed MIME body. This can be exploited to crash the service by
sending a specially crafted email to a user and tricking him into
listening to the voicemail.

Successful exploitation requires that the IMAP backend for the
voicemail feature is used. Reportedly, other backends are not
affected.

The vulnerability is reported in version 1.4.5 - 1.4.11. Other
versions may also be affected.

SOLUTION:
Reportedly, this will be fixed in version 1.4.12.

The vendor has released a patch:
http://lists.digium.com/pipermail/asterisk-commits/2007-August/015743.html

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Kevin Stewart.

ORIGINAL ADVISORY:
http://downloads.digium.com/pub/asa/AST-2007-021.html

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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:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


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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