F-Secure BlackLight 2.2.1092 Local Privilege Escalation Vulnerability

Title: F-Secure BlackLight 2.2.1092 Local Privilege Escalation Vulnerability
Advisory ID: ZSL-2011-5038
Type: Local
Impact: Privilege Escalation
Risk: (2/5)
Release Date: 14.08.2011
Summary
F-Secure BlackLight is a tool that detects files, folders and processes hidden from the user and other programs. BlackLight is also able to remove hidden malware by renaming them.
Description
The rootkit eliminator is vulnerable to an elevation of privileges vulnerability which can be used by a simple user that can change the executable file with a binary of choice. The vulnerability exist due to the improper permissions, with the 'C' flag (change/write) for the 'Everyone' group, for the 'fsbl.exe' binary file.
Vendor
F-Secure Corporation - http://www.f-secure.com
Affected Version
2.2.1092
Tested On
Microsoft Windows XP Professional SP3 (EN)
Vendor Status
[10.08.2011] Vulnerability discovered.
[10.08.2011] Initial contact with the vendor with sent details.
[10.08.2011] Auto-reply from vendor that message is received.
[13.08.2011] No reply from vendor.
[14.08.2011] Public advisory released.
[23.08.2011] After cooperating with the vendor and detailed analysis it is concluded that the vulnerability is void.
PoC
fsecure_pe.txt
Credits
Vulnerability discovered by Gjoko Krstic - <gjoko@zeroscience.mk>
References
[1] http://packetstormsecurity.org/files/104021
[2] http://www.securityfocus.com/bid/49159
[3] http://securityreason.com/exploitalert/10733
[4] http://www.vfocus.net/art/20110817/9344.html
Changelog
[14.08.2011] - Initial release
[16.08.2011] - Added reference [1], [2] and [3]
[18.08.2011] - Added reference [4]
[23.08.2011] - Added vendor status
Contact
Zero Science Lab

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