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TITLE:
Asterisk IMAP Storage Voicemail Buffer Overflow

SECUNIA ADVISORY ID:
SA27184

VERIFY ADVISORY:
http://secunia.com/advisories/27184/

CRITICAL:
Moderately critical

IMPACT:
DoS, System access

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) or potentially
to compromise a vulnerable system.

The vulnerability is caused due to a boundary error within the
IMAP-specific code for processing voicemail messages. This can be
exploited to cause a buffer overflow via a specially crafted
voicemail message sent as email containing an overly long (more than
1024 characters) combination of Content-Type or Content-Description
headers.

Successful exploitation requires that a user listens to the voicemail
message via a phone.

The vulnerability is reported in 1.4.x versions prior to 1.4.13.

SOLUTION:
Update to version 1.4.13.
http://downloads.digium.com/pub/asterisk/releases/asterisk-1.4.13.tar.gz

PROVIDED AND/OR DISCOVERED BY:
Russell Bryant and Mark Michelson

ORIGINAL ADVISORY:
http://downloads.digium.com/pub/security/AST-2007-022.html

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