Protected file disclosure via junction-point manifest sources
Published Feb 11, 2020 · Updated Aug 4, 2024
Information disclosure in Microsoft Windows Modules Installer Service allows local users to read protected files through a crafted manifest. The TrustedInstaller-hosted ISxsStore interface checks the wrapper's SYSTEM token instead of the caller's token, then follows junction-controlled manifest source paths while copying assemblies into WinSxS. Any local unprivileged account can use the exposed COM interface to copy an otherwise unreadable file into a readable location; no integrity or availability impact is demonstrated.
Summary
What happened
Information disclosure in Microsoft Windows Modules Installer Service allows local users to read protected files through a crafted manifest. The TrustedInstaller-hosted ISxsStore interface checks the wrapper's SYSTEM token instead of the caller's token, then follows junction-controlled manifest source paths while copying assemblies into WinSxS. Any local unprivileged account can use the exposed COM interface to copy an otherwise unreadable file into a readable location; no integrity or availability impact is demonstrated.
The record
- CVE
- CVE-2020-0728
- Published
- Feb 11, 2020
- Updated
- Aug 4, 2024
- Vendor
- Microsoft
- Product
- Windows 10 Version 1909
- Classifications
- T1005
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 11, 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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Is a vulnerable build present?
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- Affected versionversion=unspecified
What conditions does exploitation require?
What is affected?
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
- Proof of Concept code for CVE-2020-0728proof of concept · demonstrated
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Technologies
Your stack
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Your stack
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