ImageSharp is a 2D graphics library. From 1.0.0-beta0001 until 4.1.2, ICC CLUT parsing calculates allocation sizes from attacker-declared channel and grid dimensions before confirming that the profile contains the declared values. IccDataReader.ReadClutF32 can request a large float array, and earlier public IccProfile.Entries parsing paths can allocate a large jagged representation, from a short truncated profile. In version 4, automatic image conversion reaches the parser when DecoderOptions.ColorProfileHandling is Convert; the default Preserve mode avoids that conversion path. The demonstrated impact is memory pressure and input-validation failure, not unhandled process termination. This issue is fixed in version 4.1.2.
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.
Potential Mitigations
References
- https://github.com/SixLabors/ImageSharp/commit/8de892a7623aa8a09ba2333b624c8d2eb98325df
- https://github.com/SixLabors/ImageSharp/pull/3187
- https://github.com/SixLabors/ImageSharp/releases/tag/v4.1.2
- https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-gwg2-r3hj-4w44
- https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-gwg2-r3hj-4w44