BS.Player v2.51 build 1022 (Media Library) Remote Buffer Overflow Vulnerability Advisory: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2010-4932.php Summary: Ever since the very beginning in the year 2000, the BS.Player&#65533;has been one of the world's most popular video players. It is popular for many reasons. One however should be pointed out: BS.Player&#65533;is the first software movie player ever to enable its users to focus on watching the movie instead of dealing with poor computer capabilities or running around looking for a proper setting and codec. Also, it has very low CPU and RAM requirements. Desc: BS.Player and its feature Media Library is prone to a buffer overflow vulnerability because it fails to adequatly sanitize boundry check when processing mp3 file and its metadata. When you load the evil .mp3 file in the Media Library > Audio launched from bsplayer the application crashes instantly giving us info that ECX and EIP got overwritten enabling the attacker to gain full access to the application's memory and execute arbitrary code. Tested on Microsoft Windwos XP Professional SP3 (EN) Version tested: 2.41 build 1003 and 2.51 build 1022 Product web page: http:/www.bsplayer.org | http://www.bsplayer.com Vendor: Webteh d.o.o. Vuln found: 27.02.2010 ==================================================================================================== (edc.ac8): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. eax=00000000 ebx=00000000 ecx=41414141 edx=7c9032bc esi=00000000 edi=00000000 eip=41414141 esp=0012d250 ebp=0012d270 iopl=0 nv up ei pl zr na pe nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00210246 *** WARNING: Unable to verify checksum for C:\Program Files\Webteh\BSplayer\bsplayer.exe *** ERROR: Module load completed but symbols could not be loaded for C:\Program Files\Webteh\BSplayer\bsplayer.exe bsplayer+0x10041: 41414141 00b001e97402 add byte ptr <Unloaded_32.dll>+0x274e900 (0274e901)[eax],dh ds:0023:0274e901=?? ==================================================================================================== Vulnerability discovered by Gjoko 'LiquidWorm' Krstic liquidworm gmail com Zero Science Lab - http://www.zeroscience.mk PoC: http://zeroscience.mk/codes/aimp2_evil.mp3 [mirror] http://milw0rm.com/sploits/2009-aimp2_evil.mp3 [mirror] http://securityreason.com/download/11/13 //EOF