Remote heap overwrite via mod_sed bounds error
Published Mar 14, 2022 · Updated Aug 3, 2024
Out-of-bounds write in mod_sed in Apache HTTP Server 2.4.52 and earlier allows remote attackers to overwrite heap memory via crafted HTTP content. The filter used signed integer buffer sizes and arithmetic, so large or wrapped lengths could miscompute allocation and write past the heap buffer. Exploitation requires mod_sed to be enabled; the resulting overwrite can corrupt process memory and cause crashes or potentially broader compromise.
Summary
What happened
Out-of-bounds write in mod_sed in Apache HTTP Server 2.4.52 and earlier allows remote attackers to overwrite heap memory via crafted HTTP content. The filter used signed integer buffer sizes and arithmetic, so large or wrapped lengths could miscompute allocation and write past the heap buffer. Exploitation requires mod_sed to be enabled; the resulting overwrite can corrupt process memory and cause crashes or potentially broader compromise.
The record
- CVE
- CVE-2022-23943
- Published
- Mar 14, 2022
- Updated
- Aug 3, 2024
- Vendor
- The Apache Software Foundation
- Product
- Apache HTTP Server
- Classifications
- CWE-787, CWE-190, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 14, 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=2.4 <=2.4.52
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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