#VU20418 Permissions, Privileges, and Access Controls in Steam - CVE-2019-15315

Vulnerability identifier: #VU20418

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-15315

CWE-ID: CWE-264

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Steam
Client/Desktop applications / Other client software

Vendor: Valve Software

Description

The vulnerability allows a local attacker to escalate privileges on the system.

The vulnerability exists due to improper folder permissions. A local authenticated attacker can replace the current versions of "SteamService.exe" and "SteamService.dll" with older versions that lack the CVE-2019-14743 patch.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Steam: 2019-08-16

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External links
https://xiaoyinl.github.io/steam_EoP_bypass.html

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.