CyberRota Analysis
AI-GeneratedA heap out-of-bounds write vulnerability in the Photo CD (PCD) decoder of GraphicsMagick allows an attacker to craft a malicious PCD file that can overwrite memory beyond allocated buffers during image processing. This can lead to potential memory corruption, which may result in application crashes or arbitrary code execution. Organizations using GraphicsMagick for image processing should prioritize patching this vulnerability to mitigate risks associated with processing untrusted PCD files.
Original NVD Description
A heap out-of-bounds write exists in the Photo CD (PCD) decoder of GraphicsMagick. In DecodeImage() (coders/pcd.c), the Huffman delta loop advances its output pointer with q++ after every decoded delta and never checks it against the end of the heap-allocated luma/chroma plane buffers. The pointer is repositioned only when a sync marker introduces a new plane/row; between sync markers the run length is bounded solely by the input. A crafted PCD file that positions the pointer near the end of a plane and then supplies a long run of deltas with no intervening sync therefore walks the pointer past the end of the allocation and writes through it. Processing an untrusted PCD file — for example with gm convert or gm identify, or through any application linked against libGraphicsMagick — can corrupt heap memory beyond the buffers.