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securityvulnsSecurityvulnsSECURITYVULNS:DOC:19085
HistoryFeb 12, 2008 - 12:00 a.m.

Format string and buffer-overflow in Lst Network Print Server 9.4.2 build 105

2008-02-1200:00:00
vulners.com
7

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                         Luigi Auriemma

Application: Larson Software Technology Network Print Server
http://www.cgmlarson.com/products/NetworkPrintServer.php
Versions: <= 9.4.2 build 105
Platforms: Windows
Bugs: A] format string in logging
B] license buffer-overflow
Exploitation: remote
Date: 11 Feb 2008
Author: Luigi Auriemma
e-mail: [email protected]
web: aluigi.org

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1) Introduction
2) Bugs
3) The Code
4) Fix

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1) Introduction

LstNPS is a CGM print server for Windows.

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2) Bugs


A] format string in logging

The server is affected by a format string vulnerability located in the
logging functions (by default enabled and set on "Information") which
passes the log message directly to vsnprintf without the format
argument.


B] license buffer-overflow

The LICENSE command handled by the server leads to a buffer-overflow
vulnerability when a license string longer than 128 bytes is copied in
a stack buffer using strncpy in the wrong way.

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===========
3) The Code

A]
echo USEP %n%n%n%s%s%s|nc SERVER 3114 -v -v

B]
echo LICENSE aaaaa…160…aaaaa|nc SERVER 3114 -v -v

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4) Fix

No Fix

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Luigi Auriemma
http://aluigi.org