ImageSharp: Tiled fax TIFF: tile buffer sized by TileWidth but fax decompressor writes scanlines of ImageWidth — heap OOB write

[ Description ]Official description

ImageSharp is a 2D graphics library. From 3.0.0 until 4.1.1, tiled TIFF decoding allocates a destination buffer using TileWidth but TiffDecompressorsFactory.Create constructs T4, T6, and Modified Huffman decompressors using the full frame width. TiffDecoderCore.DecodeTilesChunky can therefore direct frame-width fax scanlines into a tile-width buffer when TileWidth is smaller than ImageWidth. The mismatch causes attacker-controlled out-of-bounds writes, heap corruption, and process termination even with legal per-row run codes. This tiled-path vulnerability is distinct from oversized CCITT runs in strip decoding. This issue is fixed in version 4.1.1.

[ Fixes ]Fixes and patches

• ImageSharp 4.1.1Fixed version · GitHub Advisories · nuget package ImageSharp: upgrade to 4.1.1 or later (affected >= 3.0.0, < 4.1.1)

[ Packages ]Affected open-source packages

• ImageSharp nugetAffected >= 3.0.0, < 4.1.1 · fixed in 4.1.1 · GHSA-v76p-62qx-wwq2

[ References ]References

• github.com/SixLabors/ImageSharp/commit/9ee7d1dd5b62d8c9f16cc755e76828386bc2191f
• github.com/SixLabors/ImageSharp/pull/3176
• github.com/SixLabors/ImageSharp/releases/tag/v4.1.1
• github.com/SixLabors/ImageSharp/security/advisories/GHSA-v76p-62qx-wwq2