Heap-based Buffer Overflow Affecting webmproject/libwebp package, versions [0.5.0,1.3.2)


Severity

Recommended
0.0
critical
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

Social Trends
Exploit Maturity
Mature
EPSS
0.04% (11th percentile)

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  • Snyk IDSNYK-UNMANAGED-WEBMPROJECTLIBWEBP-5918283
  • published26 Sept 2023
  • disclosed25 Sept 2023
  • creditApple SEAR, The Citizen Lab

Introduced: 25 Sep 2023

CVE-2023-5129  (opens in a new tab)
CWE-122  (opens in a new tab)
First added by Snyk

How to fix?

Upgrade webmproject/libwebp to version 1.3.2 or higher.

Overview

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: kTableSize. The 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 (MAX_ALLOWED_CODE_LENGTH). When BuildHuffmanTable() attempts to fill the second-level tables it may write data out-of-bounds. The OOB write to the undersized array happens in ReplicateValue().

Notes:

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.

Changelog:

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

CVSS Scores

version 3.1