Visit our newest sister site!
Hundreds of free aircraft flight manuals
Civilian • Historical • Military • Declassified • FREE!


TUCoPS :: Games :: c07-2517.htm

Limited format string in Netrek 2.12.0



Limited format string in Netrek 2.12.0
Limited format string in Netrek 2.12.0




#######################################################################

                             Luigi Auriemma

Application:  Netrek
http://www.netrek.org 
Versions:     <= 2.12.0 (Vanilla server)
Platforms:    *nix and Windows
Bug:          format string
Exploitation: remote (in-game)
Date:         02 Mar 2007
Author:       Luigi Auriemma
e-mail: aluigi@autistici.org 
              web:    aluigi.org


#######################################################################


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


#######################################################################

==============1) Introduction
==============

Netrek is a well known real-time strategy game inspired to Star Trek.


#######################################################################

=====2) Bug
=====

The Vanilla server is affected by a format string vulnerability caused
by the calling of the pmessage2() function without the needed format
argument.

The bug is located in new_warning() and can be exploitated through the
locking of a player (the same attacker too) who is using a malformed
nickname.

Note that the EVENTLOG switch must be enabled for exploiting this
vulnerability (default is disabled).

from ntserv/warning.c:

void new_warning(int index, const char *fmt, ...) {

  char temp[150];

  va_list args;
  va_start(args, fmt);

  vsprintf(temp, fmt, args);

  ...

  if (eventlog) {

    char from_str[9]="WRN->\0\0\0";

    strcat(from_str, me->p_mapchars);
    pmessage2(0, 0, from_str, me->p_no, temp);
  }


#######################################################################

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

http://aluigi.org/poc/netrekfs.zip 


#######################################################################

=====4) Fix
=====

Version 2.12.1


#######################################################################


--- 
Luigi Auriemma
http://aluigi.org 
http://mirror.aluigi.org 


TUCoPS is optimized to look best in Firefox® on a widescreen monitor (1440x900 or better).
Site design & layout copyright © 1986-2014 AOH