Memory corruption via out-of-bounds Huffman table write
Published Aug 27, 2021 · Updated Aug 3, 2024
Heap buffer overflow in ok-file-formats 1 allows remote attackers to corrupt memory by supplying a crafted JPEG file. In ok_jpg.c, ok_jpg_generate_huffman_table indexes huff->code beyond the decoder object's allocated range while building a Huffman table from attacker-controlled JPEG data. A victim application must pass the file to the JPEG decoder; the published proof of concept demonstrates the out-of-bounds write, while the precise post-corruption outcome remains undisclosed.
Summary
What happened
Heap buffer overflow in ok-file-formats 1 allows remote attackers to corrupt memory by supplying a crafted JPEG file. In ok_jpg.c, ok_jpg_generate_huffman_table indexes huff->code beyond the decoder object's allocated range while building a Huffman table from attacker-controlled JPEG data. A victim application must pass the file to the JPEG decoder; the published proof of concept demonstrates the out-of-bounds write, while the precise post-corruption outcome remains undisclosed.
The record
- CVE
- CVE-2021-28233
- Published
- Aug 27, 2021
- Updated
- Aug 3, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-787, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 27, 2021CVE 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?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
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
- heap-buffer-overflow-1.jpg proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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