high
7.5
Advisory Published
CVE Published
Updated

CVE-2021-1784

First published: Mon Apr 26 2021(Updated: )

A permissions issue existed in DiskArbitration. This was addressed with additional ownership checks. This issue is fixed in macOS Big Sur 11.3, Security Update 2021-002 Catalina, Security Update 2021-003 Mojave. A malicious application may be able to modify protected parts of the file system.

Credit: Csaba Fitzl @theevilbit Offensive Securityan anonymous researcher Mikko Kenttälä @Turmio_ SensorFuMikko Kenttälä @Turmio_ SensorFuCsaba Fitzl @theevilbit Offensive Security an anonymous researcher product-security@apple.com Mikko Kenttälä @Turmio_ SensorFuCsaba Fitzl @theevilbit Offensive Security an anonymous researcher

Affected SoftwareAffected VersionHow to fix
Apple macOS Big Sur<11.3
11.3
Apple Mojave
Apple Catalina
Apple Mac OS X>=10.14<=10.14.5
Apple Mac OS X>=10.15<=10.15.5
Apple Mac OS X=10.14.6
Apple Mac OS X=10.14.6-security_update_2019-001
Apple Mac OS X=10.14.6-security_update_2019-002
Apple Mac OS X=10.14.6-security_update_2019-004
Apple Mac OS X=10.14.6-security_update_2019-005
Apple Mac OS X=10.14.6-security_update_2019-006
Apple Mac OS X=10.14.6-security_update_2019-007
Apple Mac OS X=10.14.6-security_update_2020-001
Apple Mac OS X=10.14.6-security_update_2020-002
Apple Mac OS X=10.14.6-security_update_2020-003
Apple Mac OS X=10.14.6-security_update_2020-004
Apple Mac OS X=10.14.6-security_update_2020-005
Apple Mac OS X=10.14.6-security_update_2020-006
Apple Mac OS X=10.14.6-security_update_2020-007
Apple Mac OS X=10.14.6-security_update_2021-001
Apple Mac OS X=10.14.6-security_update_2021-002
Apple Mac OS X=10.14.6-supplemental_update
Apple Mac OS X=10.14.6-supplemental_update_2
Apple Mac OS X=10.15.6
Apple Mac OS X=10.15.6-supplemental_update
Apple Mac OS X=10.15.7
Apple Mac OS X=10.15.7-security_update_2020
Apple Mac OS X=10.15.7-security_update_2020-001
Apple Mac OS X=10.15.7-security_update_2020-005
Apple Mac OS X=10.15.7-security_update_2020-007
Apple Mac OS X=10.15.7-security_update_2021-001
Apple Mac OS X=10.15.7-supplemental_update
Apple macOS>=11.0<11.3

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for DiskArbitration?

    The vulnerability ID for DiskArbitration is CVE-2021-1784.

  • Who is affected by the DiskArbitration vulnerability?

    Users of Apple Catalina, Apple Mojave, and Apple macOS Big Sur versions up to 11.3 are affected by the DiskArbitration vulnerability.

  • What is the impact of the DiskArbitration vulnerability?

    The DiskArbitration vulnerability could lead to a permissions issue, potentially allowing unauthorized access or privilege escalation.

  • How can I fix the DiskArbitration vulnerability?

    To fix the DiskArbitration vulnerability, update to the latest version of Apple macOS Big Sur or apply the recommended security updates for Apple Catalina and Apple Mojave.

  • Where can I find more information about the DiskArbitration vulnerability?

    You can find more information about the DiskArbitration vulnerability in the references provided by Apple: [Apple Support - HT212326](https://support.apple.com/en-us/HT212326), [Apple Support - HT212327](https://support.apple.com/en-us/HT212327), [Apple Support - HT212325](https://support.apple.com/en-us/HT212325).

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