Local administrator access via spoofed PAC signature
Published Apr 9, 2024 · Updated May 3, 2025
Privilege escalation in affected Windows Server releases allows remote authenticated users to gain local administrator rights through Kerberos. During inbound Kerberos authentication, PAC validation accepts a spoofed process-user signature and bypasses signature checks. Exploitation requires a malicious or compromised service account on the accepting server, and the consequence is local administrator access.
Summary
What happened
Privilege escalation in affected Windows Server releases allows remote authenticated users to gain local administrator rights through Kerberos. During inbound Kerberos authentication, PAC validation accepts a spoofed process-user signature and bypasses signature checks. Exploitation requires a malicious or compromised service account on the accepting server, and the consequence is local administrator access.
The record
- CVE
- CVE-2024-29056
- Published
- Apr 9, 2024
- Updated
- May 3, 2025
- Vendor
- Microsoft
- Product
- Windows Server 2019
- Classifications
- CWE-327, T1558
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 9, 2024CVE publishedPublication date reported by the CVE source.
- May 3, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.17763.0 <10.0.17763.5696
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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