Pillow is a Python imaging library. Prior to 12.3.0, PIL/GdImageFile.py GdImageFile._open() read image dimensions from the GD 2.x header and stored them in self._size without calling Image._decompression_bomb_check(), allowing a crafted .gd file to trigger excessive C-heap allocation when loaded. This issue is fixed in version 12.3.0.
Weakness
The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Pillow | Python | * | 12.3.0 (excluding) |
| Red Hat Enterprise Linux 8 | RedHat | python-pillow-0:5.1.1-22.el8_10 | * |
| Pillow | Ubuntu | questing | * |
Potential Mitigations
References
- https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst
- https://github.com/python-pillow/Pillow/commit/f39b0ae6624eb2d7c5c5d651d9bb5fdbd96a8675
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-phj9-mv4w-65pm
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-phj9-mv4w-65pm