Privacy-control bypass via unchecked TCC mount
Published Sep 8, 2021 · Updated Aug 3, 2024
Improper permissions in Apple macOS DiskArbitration allow local users to modify protected file-system content through a malicious application. DiskArbitration permits a user-controlled disk image to be mounted over ~/Library/Application Support/com.apple.TCC without sufficient ownership validation, substituting a crafted TCC database. Execution as the logged-in user is required; the substituted database grants the malicious application selected privacy permissions without directly granting root access.
Summary
What happened
Improper permissions in Apple macOS DiskArbitration allow local users to modify protected file-system content through a malicious application. DiskArbitration permits a user-controlled disk image to be mounted over ~/Library/Application Support/com.apple.TCC without sufficient ownership validation, substituting a crafted TCC database. Execution as the logged-in user is required; the substituted database grants the malicious application selected privacy permissions without directly granting root access.
The record
- CVE
- CVE-2021-1784
- Published
- Sep 8, 2021
- Updated
- Aug 3, 2024
- Vendor
- Apple
- Product
- macOS
- Classifications
- T1548.006
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 8, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=unspecified <11.3
- Affected versionversion=unspecified <2021
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
- Mount(ain) of Bugs CVE-2021-1784 demonstrationproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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