Measured-boot log tampering via unparsed event types
Published Jun 9, 2020 · Updated Aug 4, 2024
Security feature bypass in Microsoft Windows Host Guardian Service allows remote authenticated users to tamper with measured-boot logs. The service accepts an event-log type its parsers do not interpret, allowing an attacker-controlled hash to be appended without an alert. Low privileges and network access to HGS are required; the consequence is undetected modification of the measured-boot log, not code execution.
Summary
What happened
Security feature bypass in Microsoft Windows Host Guardian Service allows remote authenticated users to tamper with measured-boot logs. The service accepts an event-log type its parsers do not interpret, allowing an attacker-controlled hash to be appended without an alert. Low privileges and network access to HGS are required; the consequence is undetected modification of the measured-boot log, not code execution.
The record
- CVE
- CVE-2020-1259
- Published
- Jun 9, 2020
- Updated
- Aug 4, 2024
- Vendor
- Microsoft
- Product
- Windows 10 Version 1909
- Classifications
- T1562.001
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 9, 2020CVE publishedPublication date reported by the CVE source.
- Aug 4, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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- Affected versionversion=unspecified
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What is affected?
Attacks
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Public exploit references
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