Pillow is a Python imaging library. Prior to 12.3.0, PIL/BdfFontFile.py bdf_char() read the BBX width and height field from a BDF font file and passed attacker-controlled dimensions to Image.new() without calling Image._decompression_bomb_check(), bypassing Pillows documented decompression bomb protection and allowing excessive memory allocation. 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/0a263e6264aa5399988d9acd3bbfbca2ca3ec77d
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-45hq-cxwh-f6vc
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-45hq-cxwh-f6vc