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Kamailio 4.3.4 Heap Overflow

Kamailio 4.3.4 Heap Overflow
Posted Mar 30, 2016
Authored by Stelios Tsampas

Kamailio version 4.3.4 suffers from a heap overflow vulnerability in the SEAS module.

tags | advisory, overflow
advisories | CVE-2016-2385
SHA-256 | 6fedcc73fcc0ae7d95340442033ef8adcad854d21bc18335d02bdf5bb8c4a966

Kamailio 4.3.4 Heap Overflow

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Kamailio (successor of former OpenSER and SER) is an Open Source SIP
Server released under GPL. It can be used to build large platforms for
VoIP and realtime communications, presence, WebRTC, Instant messaging
and other applications.

A heap overflow was found in Kamailio version 4.3.4 (possibly affecting
earlier versions also). The heap overflow takes place in the encode_msg
function of the SEAS module and can be triggered remotely if the module
is enabled.

A technical analysis of the vulnerability can be found here:
https://census-labs.com/news/2016/03/30/kamailio-seas-heap-overflow/

The vulnerability may allow an attacker to cause memory corruption,
process termination or potentially remote code execution.

This defect has been fixed in version 4.3.5 of Kamailio. Administrators
of affected systems are strongly advised to upgrade Kamailio to the
latest stable release.

Disclosure Timeline
-------------------
Vendor Contact: February 12th, 2016
CVE assignment: February 15th, 2016
Vendor Patch Release: March 3rd, 2016
Public Advisory: March 30th, 2016

Regards,

Stelios Tsampas

IT Security Researcher
CENSUS S.A.
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