TITLE:
Lynx "HTrjis()" NNTP Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA17216

VERIFY ADVISORY:
http://secunia.com/advisories/17216/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
Lynx 2.x
http://secunia.com/product/5883/

DESCRIPTION:
Ulf Harnhammar has reported a vulnerability in Lynx, which can be
exploited by malicious people to compromise a user's system.

The vulnerability is caused due to a boundary error in the "HTrjis()"
function in the handling of article headers sent from NNTP (Network
News Transfer Protocol) servers. This can be exploited to cause a
stack-based buffer overflow by e.g. tricking a user into visiting a
malicious web site which redirects to a malicious NNTP server via the
"nntp:" URI handler.

Successful exploitation allows execution of arbitrary code.

The vulnerability has been reported in versions 2.8.3, 2.8.4, 2.8.5,
and 2.8.6dev.13. Other versions may also be affected.

SOLUTION:
The vulnerability has been fixed in version 2.8.6dev.14.

PROVIDED AND/OR DISCOVERED BY:
Ulf Harnhammar

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