Due to a missing check for 0 value of replace_extent, it is possible for offset p to overflow in SubstituteString(), causing potential impact to application availability. This could be triggered by a crafted input file that is processed by ImageMagick. This flaw affects ImageMagick versions prior to 7.0.8-68.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1894691
- https://bugzilla.redhat.com/show_bug.cgi?id=1894691
- https://lists.debian.org/debian-lts-announce/2021/03/msg00030.html
- https://lists.debian.org/debian-lts-announce/2021/03/msg00030.html
- https://lists.debian.org/debian-lts-announce/2023/03/msg00008.html
- https://lists.debian.org/debian-lts-announce/2023/03/msg00008.html