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TITLE:
Nortel IP Softphone 2050 Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA27252

VERIFY ADVISORY:
http://secunia.com/advisories/27252/

CRITICAL:
Moderately critical

IMPACT:
DoS, System access

WHERE:
>From local network

SOFTWARE:
Nortel IP Softphone 2050
http://secunia.com/product/16187/

DESCRIPTION:
A vulnerability has been reported in Nortel IP Softphone 2050, which
can be exploited by malicious people to cause a DoS (Denial of
Service) and potentially to compromise a vulnerable system.

The vulnerability is caused due to boundary errors when processing
invalid packets sent to the RTCP port. This can be exploited to cause
a buffer overflow and crash the application via specially crafted
packets.

Successful exploitation may allow execution of arbitrary code.

SOLUTION:
Use only in a trusted network environment.

NOTE: The vendor is still investigating the vulnerability.

PROVIDED AND/OR DISCOVERED BY:
Daniel Stirnimann and Cyrill Brunschwiler, Compass Security Network
Computing AG

ORIGINAL ADVISORY:
Nortel:
http://support.nortel.com/go/main.jsp?cscat=BLTNDETAIL&id=655203

Compass Security Network Computing AG:
http://www.csnc.ch/static/advisory/csnc/nortel_UNIStim_IP_softphone_buffer-overflow_v1.0.txt

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