TITLE:
eStara SoftPhone SIP Packet Handling Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA18410

VERIFY ADVISORY:
http://secunia.com/advisories/18410/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
eStara SoftPhone 3.x
http://secunia.com/product/6784/

DESCRIPTION:
ZwelL has discovered a vulnerability in eStara SoftPhone, which can
be exploited by malicious people to compromise a user's system.

The vulnerability is caused due to a boundary error in the handling
of SIP packets that contains SDP session data. This can be exploited
to cause a stack-based buffer overflow and allows execution of
arbitrary code via a specially-craft SIP packet sent to 5060/udp.

The vulnerability has been confirmed in version 3.0.1.46 and also
reported in version 3.0.1.14. Other versions may also be affected.

SOLUTION:
Restrict use to within trusted networks only and filter potentially
malicious UDP packets with a firewall.

PROVIDED AND/OR DISCOVERED BY:
ZwelL

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