From: Secunia Security Advisories (sec-advsecunia.com)
Date: Tue Nov 28 2006 - 06:17:05 CST

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To improve our services to our customers, we have made a number of
additions to the Secunia Advisories and have started translating the
advisories to German.

The improvements will help our customers to get a better
understanding of how we reached our conclusions, how it was rated,
our thoughts on exploitation, attack vectors, and scenarios.

This includes:
* Reason for rating
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TITLE:
3CTftpSvc TFTP Server Long Mode Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA23113

VERIFY ADVISORY:
http://secunia.com/advisories/23113/

CRITICAL:
Moderately critical

IMPACT:
System access

WHERE:
From local network

SOFTWARE:
3CTftpSvc 2.x
http://secunia.com/product/12758/

DESCRIPTION:
Liu Qixu has discovered a vulnerability in 3CTftpSvc, which can be
exploited by malicious people to compromise a vulnerable system.

The vulnerability is caused due to a boundary error during the
processing of TFTP Read/Write request packet types. This can be
exploited to cause a stack-based buffer overflow by sending a
specially crafted packet with an overly long mode field (more than
460 bytes).

Successful exploitation allows execution of arbitrary code.

The vulnerability is confirmed in version 2.0.1. Other versions may
also be vulnerable.

SOLUTION:
Use in a trusted network environment only.

PROVIDED AND/OR DISCOVERED BY:
Liu Qixu, NCNIPC

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