An issue was discovered in Pillow before 8.2.0. For FLI data, FliDecode did not properly check that the block advance was non-zero, potentially leading to an infinite loop on load.
Weakness
The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Pillow | Python | * | 8.2.0 (excluding) |
| Red Hat Enterprise Linux 8 | RedHat | python-pillow-0:5.1.1-16.el8 | * |
| Pillow | Ubuntu | bionic | * |
| Pillow | Ubuntu | devel | * |
| Pillow | Ubuntu | esm-infra/bionic | * |
| Pillow | Ubuntu | esm-infra/focal | * |
| Pillow | Ubuntu | focal | * |
| Pillow | Ubuntu | groovy | * |
| Pillow | Ubuntu | hirsute | * |
| Pillow | Ubuntu | impish | * |
| Pillow | Ubuntu | jammy | * |
| Pillow | Ubuntu | kinetic | * |
| Pillow | Ubuntu | lunar | * |
| Pillow | Ubuntu | mantic | * |
| Pillow | Ubuntu | noble | * |
| Pillow | Ubuntu | oracular | * |
| Pillow | Ubuntu | plucky | * |
| Pillow | Ubuntu | questing | * |
| Pillow | Ubuntu | trusty | * |
| Pillow | Ubuntu | trusty/esm | * |
| Pillow | Ubuntu | upstream | * |
| Pillow | Ubuntu | xenial | * |
| Pillow-python2 | Ubuntu | focal | * |
| Pillow-python2 | Ubuntu | groovy | * |
| Python-imaging | Ubuntu | precise/esm | * |
References
- https://github.com/python-pillow/Pillow/commit/bb6c11fb889e6c11b0ee122b828132ee763b5856
- https://github.com/python-pillow/Pillow/pull/5377
- https://lists.debian.org/debian-lts-announce/2021/07/msg00018.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MQHA5HAIBOYI3R6HDWCLAGFTIQP767FL/
- https://pillow.readthedocs.io/en/stable/releasenotes/8.2.0.html#cve-2021-28676-fix-fli-dos
- https://security.gentoo.org/glsa/202107-33
- https://github.com/python-pillow/Pillow/commit/bb6c11fb889e6c11b0ee122b828132ee763b5856
- https://github.com/python-pillow/Pillow/pull/5377
- https://lists.debian.org/debian-lts-announce/2021/07/msg00018.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MQHA5HAIBOYI3R6HDWCLAGFTIQP767FL/
- https://pillow.readthedocs.io/en/stable/releasenotes/8.2.0.html#cve-2021-28676-fix-fli-dos
- https://security.gentoo.org/glsa/202107-33