An integer overflow was addressed through improved input validation. This issue is fixed in iOS 14.7, macOS Big Sur 11.5, watchOS 7.6, tvOS 14.7, Security Update 2021-005 Mojave, Security Update 2021-004 Catalina. Processing a maliciously crafted font file may lead to arbitrary code execution.
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
| Link | Tags |
|---|---|
| https://support.apple.com/en-us/HT212601 | vendor advisory |
| https://support.apple.com/en-us/HT212602 | vendor advisory |
| https://support.apple.com/en-us/HT212605 | vendor advisory |
| https://support.apple.com/en-us/HT212600 | vendor advisory |
| https://support.apple.com/en-us/HT212603 | vendor advisory |
| https://support.apple.com/en-us/HT212604 | vendor advisory |