Title: Asseco SEE iBank FX Client <= 2.0.9.3 Local Privilege Escalation Vulnerability
Advisory ID: ZSL-2014-5168
Type: Local
Impact: Privilege Escalation
Risk: (2/5)
Release Date: 06.02.2014

Summary

FX Client is an offline application for e-banking that is intended only for legal entities.

Description

The application 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 'F' flag (full) for the 'Everyone' and 'Users' group, for the 'RichClient.exe' and 'fxclient.exe' binary files making them world-writable. After you replace the binary with your rootkit, on reboot you get SYSTEM privileges.

Vendor

Asseco SEE - http://www.asseco.com

Affected Version

2.0.9.3 (Build 22.06.2011) - Desktop/Enterprise Edition
1.2
1.1.5.1270 (Service Pack 5) - Desktop Edition
1.1.5.1247
1.0

Tested On

Microsoft Windows 7 Ultimate SP1 (EN) 32/64bit
Microsoft Windows 7 Professional SP1 (EN) 32/64bit
Microsoft Windows XP Professional SP3 (EN) 32bit

Vendor Status

N/A

PoC

fxclient_pe.txt

Credits

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

References

[1] http://www.exploit-db.com/exploits/31460/
[2] http://cxsecurity.com/issue/WLB-2014020053
[3] http://packetstormsecurity.com/files/125093
[4] http://1337day.com/exploit/21865
[5] http://osvdb.org/show/osvdb/103048
[6] http://www.securityfocus.com/bid/65456

Changelog

[06.02.2014] - Initial release
[07.02.2014] - Added reference [2], [3] and [4]
[09.02.2014] - Added reference [5]
[12.02.2014] - Added reference [6]

Contact

Zero Science Lab

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