Trust-password disclosure via reused RC4 keystream
Published Jan 11, 2022 · Updated Jan 2, 2025
Security feature bypass in affected Microsoft Windows releases allows context-dependent attackers to read MS-LSAD trust passwords in transit. MS-LSAD reuses an RC4 keystream when encrypting multiple trusted-domain authentication requests within one transport session, enabling XOR-based cryptanalysis. Exploitation requires multiple RC4-encrypted requests in one session and user interaction, and the reported consequence is limited to confidentiality.
Summary
What happened
Security feature bypass in affected Microsoft Windows releases allows context-dependent attackers to read MS-LSAD trust passwords in transit. MS-LSAD reuses an RC4 keystream when encrypting multiple trusted-domain authentication requests within one transport session, enabling XOR-based cryptanalysis. Exploitation requires multiple RC4-encrypted requests in one session and user interaction, and the reported consequence is limited to confidentiality.
The record
- CVE
- CVE-2022-21913
- Published
- Jan 11, 2022
- Updated
- Jan 2, 2025
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- T1040
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 11, 2022CVE publishedPublication date reported by the CVE source.
- Jan 2, 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?
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- Affected versionversion=10.0.10240.0 <10.0.10240.19177
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
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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