The OOB write to the undersized array happens in ReplicateValue. When BuildHuffmanTable() attempts to fill the second-level tables it may write data out-of-bounds. libwebp allows codes that are up to 15-bit ( MAX_ALLOWED_CODE_LENGTH). The kTableSize array only takes into account sizes for 8-bit first-level table lookups but not second-level table lookups. The color_cache_bits value defines which size to use. An attacker can craft a special WebP lossless file that triggers the ReadHuffmanCodes() function to allocate the HuffmanCode buffer with a size that comes from an array of precomputed sizes: kTableSize. Electron is a framework which lets you write cross-platform desktop applications using JavaScript, HTML and CSS.Īffected versions of this package are vulnerable to Heap-based Buffer Overflow when the ReadHuffmanCodes() function is used.
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