Ubisoft Uplay 4.6 Insecure File Permissions Local Privilege Escalation

Title: Ubisoft Uplay 4.6 Insecure File Permissions Local Privilege Escalation
Advisory ID: ZSL-2014-5191
Type: Local
Impact: Privilege Escalation
Risk: (2/5)
Release Date: 03.07.2014
Uplay is a digital distribution, digital rights management, multiplayer and communications service created by Ubisoft to provide an experience similar to the achievements/trophies offered by various other game companies.
Uplay for PC suffers from 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 'Everyone' group, making the entire directory 'Ubisoft Game Launcher' and its files and sub-dirs world-writable.
Ubisoft Entertainment S.A. - http://www.ubi.com
Affected Version
4.6.3208 (PC) (PC)
Tested On
Microsoft Windows 7 Professional SP1 (EN)
Microsoft Windows 7 Ultimate SP1 (EN)
Vendor Status
[30.05.2014] Vulnerability discovered.
[30.05.2014] Vendor notified with details.
[01.06.2014] Vendor responds with confirmation.
[04.06.2014] Working with the vendor.
[03.07.2014] Vendor releases fixed version to address this issue.
[03.07.2014] Coordinated public security advisory released.
Vulnerability discovered by Gjoko Krstic - <gjoko@zeroscience.mk>
[1] http://forums.ubi.com/forumdisplay.php/513-Uplay
[2] http://cxsecurity.com/issue/WLB-2014070019
[3] http://osvdb.org/show/osvdb/108726
[4] http://www.exploit-db.com/exploits/33961/
[5] http://www.securityfocus.com/bid/68407
[6] http://1337day.com/exploit/22405
[7] http://packetstormsecurity.com/files/127355
[8] http://secunia.com/advisories/59472/
[9] http://cve.mitre.org/cgi-bin/cvename.cgi?name=2014-5453
[10] http://www.securiteam.com/securitynews/5EP340UEVA.html
[03.07.2014] - Initial release
[04.07.2014] - Added reference [3] and [4]
[05.07.2014] - Added reference [5] and [6]
[06.07.2014] - Added reference [7]
[18.07.2014] - Added reference [8]
[05.10.2014] - Added reference [9]
[20.02.2015] - Added reference [10]
Zero Science Lab

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