Title: ESTsoft ALPlayer 2.0 ASX Playlist File Handling Buffer Overflow Vulnerability
Advisory ID: ZSL-2011-5023
Type: Local/Remote
Impact: System Access, DoS
Risk: (4/5)
Release Date: 06.07.2011

Summary

ALPlayer (former ALShow) is an easy-to-use media player that comes equipped with plenty of codecs, and it's prepared to download more if needed.

Description

The vulnerability is caused due to a boundary error in the processing of a playlist file , which can be exploited to cause a stack-based buffer overflow when a user opens e.g. a specially crafted .asx file. Successful exploitation may allow execution of arbitrary code.

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(188.820): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=0095c8e0 ebx=0012e560 ecx=00004141 edx=00ce4fc0 esi=026d1902 edi=0012e5ac
eip=7855c776 esp=0012e458 ebp=0012e468 iopl=0 nv up ei pl zr na pe nc
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00210246
MSVCR90!_isspace_l+0x3b:
7855c776 0fb70448 movzx eax,word ptr [eax+ecx*2] ds:0023:00964b62=????

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Vendor

ESTsoft Corp. - http://www.altools.com

Affected Version

2.0.0.4

Tested On

Microsoft Windows XP Professional SP3 (EN)

Vendor Status

N/A

PoC

alplayer_bof.txt
alplayer_bof.rar

Credits

Vulnerability discovered by Gjoko Krstic - <gjoko@zeroscience.mk>

References

[1] http://www.exploit-db.com/exploits/17497/
[2] http://packetstormsecurity.org/files/102865
[3] http://www.securityfocus.com/bid/48583
[4] http://securityreason.com/exploitalert/10600

Changelog

[06.07.2011] - Initial release
[07.07.2011] - Added reference [2] and [3]
[09.07.2011] - Added reference [4]

Contact

Zero Science Lab

Web: http://www.zeroscience.mk
e-mail: lab@zeroscience.mk