CVE-2023-3758

What it actually does

A race condition in SSSD causes Group Policy Object (GPO) policies to be applied inconsistently for authenticated users, resulting in improper authorization decisions that grant or deny resource access incorrectly.

Why it matters to the business

Organizations face risks of unauthorized resource access or erroneous denials, leading to policy violations, potential data exposure, and operational disruptions in environments relying on centralized policy enforcement.

How an attack unfolds

An attacker authenticates via SSSD on an adjacent network and times actions to exploit the window where GPO policies fail to apply consistently, resulting in inappropriate authorization outcomes for resources.

How to fix it

Upgrade SSSD to a version containing commit 595c4c6d2bcee3f88818813585eccda80546e0ab or later; apply the update across all affected deployments and restart related services.

How to confirm the fix worked

Confirm the installed SSSD binary or package includes the referenced commit hash, then perform repeated authentication and GPO policy checks to verify consistent application across users.

Typical attack path

1. Gain authenticated access to an affected SSSD-managed system
2. Trigger concurrent GPO policy evaluation during the race condition window
3. Interact with resources to observe or leverage inconsistent authorization decisions

How to detect it

Examine SSSD and system logs for repeated or inconsistent GPO policy application messages and authorization events that do not match expected policy outcomes.

What your security team should do

• Apply the fixed SSSD version immediately due to the authorization impact
• Audit GPO policies for any reliance on consistent enforcement
• Implement monitoring for unexpected authorization changes post-upgrade