Heap-based Buffer Overflow Affecting webmproject/libwebp package, versions [0.5.0,1.3.2)
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- Snyk ID SNYK-UNMANAGED-WEBMPROJECTLIBWEBP-5918283
- published 26 Sep 2023
- disclosed 25 Sep 2023
- credit Apple SEAR, The Citizen Lab
How to fix?
webmproject/libwebp to version 1.3.2 or higher.
Affected versions of this package are vulnerable to Heap-based Buffer Overflow. This advisory has been marked deprecated in favor of CVE-2023-4863
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:
color_cache_bits value defines which size to use. The
kTableSize array only takes into account sizes for 8-bit first-level table lookups but not second-level table lookups. libwebp allows codes that are up to 15-bit (
BuildHuffmanTable() attempts to fill the second-level tables it may write data out-of-bounds. The OOB write to the undersized array happens in
This is only exploitable if the
color_cache_bits value defines which size to use.
This vulnerability was first published on Chrome as CVE-2023-4863.
2023-09-26: Initial advisory publication
2023-09-27: Advisory details updated, including CVSS, CWE, references
2023-09-27: CVE-2023-5129 rejected as a duplicate of CVE-2023-4863
2023-09-28: This advisory has been marked deprecated in favor of CVE-2023-4863