CVE-2020-27950 on CISA KEV

A memory initialization issue was addressed. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 12.4.9, watchOS 6.2.9, Security Update 2020-006 High Sierra, Security Update 2020-006 Mojave, iOS 14.2 and iPadOS 14.2, watchOS 5.3.9, macOS Catalina 10.15.7 Supplemental Up

01What CISA says about this vulnerability

A memory initialization issue was addressed. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 12.4.9, watchOS 6.2.9, Security Update 2020-006 High Sierra, Security Update 2020-006 Mojave, iOS 14.2 and iPadOS 14.2, watchOS 5.3.9, macOS Catalina 10.15.7 Supplemental Update, macOS Catalina 10.15.7 Update. A malicious application may be able to disclose kernel memory.

02Required action — verbatim from CISA

Apply updates per vendor instructions.

03Notes & references

• support.apple.com — https://support.apple.com/en-us/HT211931
• support.apple.com — https://support.apple.com/en-us/HT211928
• support.apple.com — https://support.apple.com/en-us/HT211929
• support.apple.com — https://support.apple.com/en-us/HT211940
• support.apple.com — https://support.apple.com/en-us/HT211944
• support.apple.com — https://support.apple.com/en-us/HT211945
• support.apple.com — https://support.apple.com/en-us/HT211946
• support.apple.com — https://support.apple.com/en-us/HT211947
• seclists.org — http://seclists.org/fulldisclosure/2020/Dec/32
• packetstormsecurity.com — http://packetstormsecurity.com/files/161296/XNU-Kernel-Mach-Message-Trailers-Mem…

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

Vendor	Product	Versions
Apple	watchOS	unspecified
Apple	iOS and iPadOS	unspecified
Apple	macOS	unspecified
Apple	macOS	unspecified
Apple	macOS	unspecified
Apple	macOS	unspecified
Apple	macOS	unspecified
Apple	macOS	unspecified

06Detection

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection:

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