Memory disclosure via unchecked LZW code
Published Jun 13, 2022 · Updated Aug 3, 2024
Out-of-bounds access in Chafa before 1.12.0 allows local users to read unintended memory by processing a crafted GIF file. The bundled libnsgif lzw_decode function accepts an LZW code at or above the 12-bit table limit and accesses the decoder table without a bounds check. The command-line image loader must process the malicious file, and the documented consequence is memory disclosure with no reported data modification.
Summary
What happened
Out-of-bounds access in Chafa before 1.12.0 allows local users to read unintended memory by processing a crafted GIF file. The bundled libnsgif lzw_decode function accepts an LZW code at or above the 12-bit table limit and accesses the decoder table without a bounds check. The command-line image loader must process the malicious file, and the documented consequence is memory disclosure with no reported data modification.
The record
- CVE
- CVE-2022-2061
- Published
- Jun 13, 2022
- Updated
- Aug 3, 2024
- Vendor
- Hans Petter Jansson
- Product
- Chafa
- Classifications
- CWE-787, CWE-122
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 13, 2022CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=unspecified <1.12.0
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- huntr.dev crafted-GIF proof of conceptproof of concept · unverified
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Technologies
Your stack
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Your stack
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