medium
5.5
Advisory Published
CVE Published
Updated

CVE-2021-30738

First published: Mon May 24 2021(Updated: )

A malicious application may be able to overwrite arbitrary files. This issue is fixed in macOS Big Sur 11.4, Security Update 2021-004 Mojave. An issue with path validation logic for hardlinks was addressed with improved path sanitization.

Credit: Qingyang Chen Topsec Alpha TeamCsaba Fitzl @theevilbit Offensive Security product-security@apple.com Qingyang Chen Topsec Alpha TeamCsaba Fitzl @theevilbit Offensive Security

Affected SoftwareAffected VersionHow to fix
Apple macOS Big Sur<11.4
11.4
Apple Mojave
Apple Mac OS X>=10.14.0<=10.14.5
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-security_update_2021-003
Apple Mac OS X=10.14.6-supplemental_update
Apple Mac OS X=10.14.6-supplemental_update_2
Apple macOS>=11.0.1<11.4

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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 CVE-2021-30738?

    CVE-2021-30738 is a vulnerability in PackageKit that allows a malicious application to overwrite arbitrary files.

  • How does CVE-2021-30738 impact macOS Big Sur 11.4?

    CVE-2021-30738 affects macOS Big Sur 11.4 by introducing a vulnerability that allows a malicious application to overwrite arbitrary files.

  • Is Apple Mojave affected by CVE-2021-30738?

    Yes, Apple Mojave is also affected by CVE-2021-30738.

  • How can I mitigate the vulnerability in macOS Big Sur 11.4?

    To mitigate the vulnerability in macOS Big Sur 11.4, it is recommended to update to the latest version of the operating system and apply any available security patches.

  • Where can I find more information about CVE-2021-30738?

    More information about CVE-2021-30738 can be found on the Apple support website: [https://support.apple.com/en-us/HT212529](https://support.apple.com/en-us/HT212529)

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