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Date: Wed, 10 Dec 2014 16:04:38 +0000
From: Portcullis Advisories <advisories@...tcullis-security.com>
To: "'bugtraq@...urityfocus.com'" <bugtraq@...urityfocus.com>,
	"'fulldisclosure@...lists.org'" <fulldisclosure@...lists.org>,
	"'moderators@...db.org'" <moderators@...db.org>, "'vuln@...unia.com'"
	<vuln@...unia.com>
Subject: [FD] CVE-2014-8608 - Null Pointer Dereference In K7 Computing
 Multiple Products [K7Sentry.sys]

Vulnerability title: Null Pointer Dereference In K7 Computing Multiple Products [K7Sentry.sys]
CVE: CVE-2014-8608
Vendor: K7 Computing
Product: Multiple Products [K7Sentry.sys]
Affected version: 12.8.0.104
Fixed version: 12.8.0.119
Reported by: Kyriakos Economou
Details:

Latest and possibly earlier versions of K7Sentry.sys kernel mode driver, also named as the 'K7AV Sentry Device Driver', allows any local user to crash the system by creating a file that contains the string "crashme$$" in its name. Once the file is created, any attempt to access it will result in a null pointer dereference leading to a system crash through a BSoD.

b9d087ce ff156059dab9 call dword ptr [K7Sentry+0xa9960 (b9da5960)] ds:0023:b9da5960={nt!wcsstr (80537ff5)} - search for "crashme$$" in the filename
b9d087d4 83c408 add esp,8
b9d087d7 85c0 test eax,eax
b9d087d9 7406 je K7Sentry+0xc7e1 (b9d087e1)
b9d087db 893500000000 mov dword ptr ds:[0],esi - if found write esi to [0] leading to system crash

Further details at:

https://www.portcullis-security.com/security-research-and-downloads/security-advisories/cve-2014-8608/

Copyright:
Copyright (c) Portcullis Computer Security Limited 2014, All rights reserved worldwide. Permission is hereby granted for the electronic redistribution of this information. It is not to be edited or altered in any way without the express written consent of Portcullis Computer Security Limited.

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