CVE-2019-15316

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Published Aug 21, 2019 CVSS 3.0 · 7.0 High EPSS < 1% KEV · Not listed

Description

Valve Steam Client for Windows through 2019-08-20 has weak folder permissions, leading to privilege escalation (to NT AUTHORITY\SYSTEM) via crafted use of CreateMountPoint.exe and SetOpLock.exe to leverage a TOCTOU race condition.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

n/a

n/a

affected

Version	Status	Constraints
`n/a`	affected	—

Configuration 1 [-]

AND

cpe:2.3:a:valvesoftware:steam_client:*:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source	ID	Title
EUVD	EUVD-2019-6317	Valve Steam Client for Windows through 2019-08-20 has weak folder permissions, leading to privilege escalation (to NT AUTHORITY\SYSTEM) via crafted use of CreateMountPoint.exe and SetOpLock.exe to leverage a TOCTOU race condition.

Metrics

No CVSS v4.0

No CVSS v3.1

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

Access Vector Local

Access Complexity Medium

Authentication None

Confidentiality Impact Complete

Integrity Impact Complete

Availability Impact Complete

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.446% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://amonitoring.ru/article/onemore_steam_eop_0day/
https://habr.com/ru/company/pm/blog/464367/
https://www.youtube.com/watch?v=I93aH86BUaE
https://www.youtube.com/watch?v=ZCHrjP0cMew

History

No history.

Subscriptions

Microsoft Windows

Valvesoftware Steam Client

Weaknesses

Sources

CVE record Updated: Aug 5, 2024, 12:42 AM

Status: PUBLISHED
Assigner: mitre
Published: Aug 21, 2019, 7:36 PM
Updated: Aug 5, 2024, 12:42 AM
Reserved: Aug 21, 2019, 12:00 AM

View source JSON

Vulnrichment No data

No data.

NVD Updated: Jun 17, 2026, 2:20 AM

Status: Modified
Published: Aug 21, 2019, 8:15 PM
Modified: Jun 17, 2026, 2:20 AM

View source JSON

Red Hat No data

No data.

OpenCVE enrichment No data

No data.

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