Pillow: Infinite loop in MIC n_frames when the embedded TIFF

[ Why it matters ]Priority signals

• Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official description

Pillow is a Python imaging library. From 7.2.0 until 13.0.0, Pillow can enter an infinite loop while determining the frame count of a MIC image. MicImageFile inherits TIFF frame traversal, but MicImageFile.tell reports the OLE stream index and its seek() resets TIFF frame state, so an embedded TIFF with at least three IFDs never advances. When an application with olefile installed reads n_frames or saves all frames from a crafted MIC file, the non-advancing traversal can hold a worker at full CPU indefinitely. This issue is fixed in version 13.0.0.

[ Fixes ]Fixes and patches

• Pillow 13.0.0Fixed version · GitHub Advisories · pip package Pillow: upgrade to 13.0.0 or later (affected >= 7.2.0, < 13.0.0)

[ Packages ]Affected open-source packages

• Pillow pipAffected >= 7.2.0, < 13.0.0 · fixed in 13.0.0 · GHSA-22hg-r758-rrw9

[ References ]References

• github.com/python-pillow/Pillow/commit/26cb3ed061173b817b9ee4b6f507cb0e1e293218
• github.com/python-pillow/Pillow/releases/tag/13.0.0
• github.com/python-pillow/Pillow/security/advisories/GHSA-22hg-r758-rrw9