Apple Multiple Products Memory Corruption Vulnerability

[ Why it matters ]Priority signals

• Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2021-11-03
• EPSS: 22% chance of exploitation in the next 30 days (higher than 98% of CVEs)

[ Description ]Official description

A memory corruption issue was addressed with improved input validation. 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. Processing a maliciously crafted font may lead to arbitrary code execution.

CISA: Apple iOS, iPadOS, macOS, and watchOS FontParser contain a memory corruption vulnerability which may allow for code execution when processing maliciously crafted front.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 3 May 2022): Apply updates per vendor instructions.

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• packetstormsecurity.com/files/161294/Apple-Safari-Remote-Code-Execution.htmlThird Party AdvisoryVDB Entry
• seclists.org/fulldisclosure/2020/Dec/32Mailing ListThird Party Advisory
• support.apple.com/en-us/HT211928Vendor Advisory
• support.apple.com/en-us/HT211929Vendor Advisory
• support.apple.com/en-us/HT211931Vendor Advisory
• support.apple.com/en-us/HT211940Vendor Advisory
• support.apple.com/en-us/HT211944Vendor Advisory
• support.apple.com/en-us/HT211945Vendor Advisory
• support.apple.com/en-us/HT211946Vendor Advisory
• support.apple.com/en-us/HT211947Vendor Advisory
• www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource