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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-LCD; 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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