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Steam 2.10.91.91 Weak File Permissions Privilege Escalation

Steam 2.10.91.91 Weak File Permissions Privilege Escalation
Posted Nov 23, 2015
Authored by Andrew J. Smith

A privilege escalation vulnerability has been identified in that the Steam Microsoft Windows client software is installed with weak default permissions. These permissions grant read and write access to the Windows Users group for the install folder. This includes Steam.exe which is launched upon user login. Version 2.10.91.91 is confirmed vulnerable.

tags | advisory
systems | windows
advisories | CVE-2015-7985
MD5 | 8901bf2b0c7dbfd4245530ccdd21f9ed

Steam 2.10.91.91 Weak File Permissions Privilege Escalation

Change Mirror Download
Steam Weak File Permissions Privilege Escalation

Vendor Website : http://store.steampowered.com/

INDEX
---------------------------------------

1. CVE
2. Background
3. Description
4. Impact
5. Affected Products
6. Solution
7. Credit
8. Disclosure Timeline


1. CVE
---------------------------------------
CVE: 2015-7985


2. BACKGROUND
---------------------------------------
Valve is the creator of Steam, the pioneering game platform that distributes and manages thousands of games directly to a community of more than 65 million players around the world.


3. DESCRIPTION
---------------------------------------

A privilege escalation vulnerability has been identified in that the Steam Microsoft Windows client software is installed with weak default permissions. These permissions grant read and write access to the Windows Users group for the install folder. This includes Steam.exe which is launched upon user login.


4. IMPACT
---------------------------------------
A low privileged user could modify the steam.exe binary and obtain code execution with elevated privileges upon an administrator login or execution of steam.exe


5. AFFECTED PRODUCTS
---------------------------------------
Only the following versions have been confirmed vulnerable:

Steam 2.10.91.91


6. SOLUTION
---------------------------------------
A workaround for the steam install folder includes removing write privileges from the Windows Users group. Additionally the vendor has provided security resources here: https://support.steampowered.com/kb_article.php?ref=1266-OAFV-8478


7. CREDIT
---------------------------------------
The vulnerability was discovered by Andrew Smith of Sword & Shield Enterprise Security.


8. DISCLOSURE TIMELINE
---------------------------------------
10-20-2015 - Vulnerability Discovered
10-26-2015 - Vendor Informed
10-26-2015 - Vendor Confirmed Receipt of Report
10-27-2015 - CVE Requested
10-28-2015 - Vendor Confirmed Public Disclosure
11-12-2015 - Public Disclosure
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