PSR - #2004-001 Remote - LCDProc

[Priv8 Security Research]

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Priv8 Security Research - #2004-001 security@priv8security.com
http://www.priv8security.com Adriano Lima
February 22nd, 2004
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Package Name: LCDproc
Vendor URL: http://lcdproc.omnipotent.net
Date: 2004-02-22
ID: PSR-#2004-001
Affected Version: All Versions
Risk: HIGH

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Package Description:

LCDproc is a software that displays real-time system information from your Linux/*BSD box on a LCD. The server supports several serial devices: Matrix Orbital, Crystal Fontz, Bayrad, LB216, LCDM001 (kernelconcepts.de), Wirz-SLI, Cwlinux(.com) and PIC-an-L
CD; and some devices connected to the LPT port: HD44780, STV5730, T6963, SED1520 and SED1330. Various clients that display things such as CPU load, system load, memory usage, uptime, and a lot more, are available.


Problem Description:

A remote exploitable buffer overflow that allows remote users to execute an arbitrary code was found on LCDd server.
The problem appears on function parse_all_client_messages() of parse.c file, a loop does not check if MAXARGUMENTS were
reached, causing the program to crash when lots of arguments are passed to the function.

Testing:

See proof of concept code on
http://www.priv8security.com/releases/priv8lcd44.pl

Solutions:

It is recommended that all users upgrade to version 0.4.4 and install the follow patch coded by Rodrigo Rubira Branco.
http://www.priv8security.com/releases/lcdproc.patch


References (See also):
http://www.priv8security.com/releases/lcdproc/lcdproc.adv1
http://www.priv8security.com/releases/lcdproc/lcdproc.adv2
http://www.priv8security.com/releases/lcdproc/lcdproc.patch
http://www.priv8security.com/releases/lcdproc/priv8lcd44.pl


ADDITIONAL INSTRUCTIONS:
Apply this patch against the latest version of lcdproc.


About Priv8 Security Research Group:
Priv8 Security is a group of programmers and enthusiastic friends
new and motivated the security area.


Questions:
If you have any questions, send a mail to security@priv8security.com

Check out our mailing lists:
<http://www.priv8security.com>


The advisory itself is available at
<http://www.priv8security.com/releases/lcdproc/lcdproc.adv1>


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