Valve Steam Browser URL vgui2_s.dll LoadTGA url_encoded_parameters privileges management

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.4$0-$5k0.00

A vulnerability, which was classified as critical, has been found in Valve Steam Browser (version unknown). This issue affects the function LoadTGA in the library vgui2_s.dll of the component URL Handler. The manipulation of the argument url_encoded_parameters with an unknown input leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is confidentiality, integrity, and availability. From Wikipedia: "Steam is a digital distribution, digital rights management, multiplayer and communications platform developed by Valve Corporation". Steam, like other software, uses ist own URL handler to enhance experience by integrating web-based functionality directly in ist own platform.

The weakness was disclosed 10/17/2012 by Luigi Auriemma as 1731296 as not defined advisory (Website). The advisory is shared at heise.de. The public release has been coordinated in cooperation with Valve. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details as well as a public exploit are known. MITRE ATT&CK project uses the attack technique T1068 for this issue.

After even before and not, there has been an exploit disclosed. The exploit is available at revuln.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $0-$5k.

It is possible to mitigate the problem by applying the configuration setting Disable steam://. A solution would be avoiding to pass command-line arguments to third party software and undocumented commands accessible from external and untrusted sources like the Internet.

The vulnerability is also documented in the vulnerability database at X-Force (79280). scmagazine.com.au is providing further details.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.4

VulDB Base Score: 7.3
VulDB Temp Score: 6.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
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Exploitinginfo

Class: Privileges management
CWE: CWE-269 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Disable
Status: 🔍

0-Day Time: 🔍

Config: Disable steam://

Timelineinfo

10/15/2012 🔍
10/17/2012 +2 days 🔍
10/18/2012 +1 days 🔍
10/18/2012 +0 days 🔍
04/16/2018 +2006 days 🔍

Sourcesinfo

Advisory: 1731296
Researcher: Luigi Auriemma
Status: Not defined
Coordinated: 🔍
X-Force: 79280, High Risk
SecurityFocus: 56111
Secunia: 50979 - Steam TGA Image Processing Integer Overflow Vulnerability, Moderately Critical
OSVDB: 86433

scip Labs: https://www.scip.ch/en/?labs.20161013
Misc.: 🔍

Entryinfo

Created: 10/18/2012 13:12
Updated: 04/16/2018 11:51
Changes: 10/18/2012 13:12 (56), 04/16/2018 11:51 (8)
Complete: 🔍

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