TITLE:
Asterisk JPEG Image Handling Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA19800

VERIFY ADVISORY:
http://secunia.com/advisories/19800/

CRITICAL:
Moderately critical

IMPACT:
DoS, System access

WHERE:
>From local network

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

DESCRIPTION:
Emmanouel Kellinis has reported a vulnerability in Asterisk, which
can be exploited by malicious people to cause a DoS (Denial of
Service) and potentially to compromise a vulnerable system.

The vulnerability is cause due to a signedness error in
"format_jpeg.c". This can be exploited to cause a buffer overflow via
an overly large JPEG image and may allow arbitrary code execution.

The vulnerability has been reported in version 1.2.6. Prior versions
may also be affected.

SOLUTION:
Update to version 1.2.7 or later.
http://ftp.digium.com/pub/asterisk/

PROVIDED AND/OR DISCOVERED BY:
Emmanouel Kellinis

ORIGINAL ADVISORY:
http://www.cipher.org.uk/index.php?p=advisories/Asterisk_Codec_Integer_Overflow_07-04-2006.advisory

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