Pillow is a Python imaging library. Prior to 13.0.0 on Windows, src/PIL/WmfImagePlugin.py passes unchecked 32-bit WMF or EMF dimensions to the native drawwmf handler in src/display.c. The handler sizes a DIB allocation from 16-bit-truncated bcWidth and bcHeight fields but copies pixel data using the original full dimensions.
A crafted wide, short metafile can pass the pixel-count decompression-bomb check and make the Windows-only renderer read beyond the heap buffer, potentially disclosing memory or crashing the process. This issue is fixed in version 13.0.0.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
Passive
Minimal interaction
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products 2
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Python Pillow
cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:*
|
— |
13.0.0
|
|
Microsoft Windows
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*
|
— | — |
References 4
https://github.com/python-pillow/Pillow/commit/4cf46bee338304c5c8968fd7f132ba0d…
security-advisories@github.com
https://github.com/python-pillow/Pillow/pull/10120
security-advisories@github.com
https://github.com/python-pillow/Pillow/releases/tag/13.0.0
security-advisories@github.com
https://github.com/python-pillow/Pillow/security/advisories/GHSA-9v9v-9qvf-h2hj
security-advisories@github.com