An issue was discovered in apng2gif 1.7. There is an integer overflow resulting in a heap-based buffer over-read, related to the load_apng function and the imagesize variable.
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://bugs.debian.org/cgi-bin/bugreport.cgi?bug=854367 | issue tracking third party advisory |
| https://lists.debian.org/debian-lts-announce/2020/03/msg00039.html | third party advisory mailing list |
| https://usn.ubuntu.com/4513-1/ | third party advisory vendor advisory |