CVE-2015-7985

Steam 54/894 - Local Privilege Escalation

Severity Score

7.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Valve Steam 2.10.91.91 uses weak permissions (Users: read and write) for the Install folder, which allows local users to gain privileges via a Trojan horse steam.exe file.

Valve Steam 2.10.91.91 utiliza permisos débiles (Usuarios: leer y escribir) para la carpeta Install, lo que permite a usuarios locales obtener privilegios a través de un archivo troyano steam.exe .

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.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2009-08-07 First Exploit
2015-10-27 CVE Reserved
2015-11-23 CVE Published
2024-08-06 CVE Updated
2025-06-28 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-276: Incorrect Default Permissions

CAPEC

References (3)

URL	Tag	Source
http://packetstormsecurity.com/files/134513/Steam-2.10.91.91-Weak-File-Permissions-Privilege-Escalation.html	Third Party Advisory
http://www.securityfocus.com/archive/1/536961/100/0/threaded	Broken Link

URL	Date	SRC
https://www.exploit-db.com/exploits/9386	2009-08-07

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Valvesoftware Search vendor "Valvesoftware"		Steam Client Search vendor "Valvesoftware" for product "Steam Client"				2.10.91.91 Search vendor "Valvesoftware" for product "Steam Client" and version "2.10.91.91"		-		Affected