Prototype pollution via inherited-property traversal
Published Apr 23, 2024 · Updated Aug 2, 2024
Prototype pollution in Conform before 1.1.1 allows remote attackers to alter object prototypes through crafted form or URL data. The parseWith path reaches setValue in formdata.ts, which follows inherited pointer properties while parsing dotted names instead of requiring own properties or rejecting proto, constructor, and prototype segments. Exposure requires a server application to pass attacker-controlled form data or URL parameters to a Conform parser; polluted properties can alter application data or crash the consuming process.
Summary
What happened
Prototype pollution in Conform before 1.1.1 allows remote attackers to alter object prototypes through crafted form or URL data. The parseWith path reaches setValue in formdata.ts, which follows inherited pointer properties while parsing dotted names instead of requiring own properties or rejecting proto, constructor, and prototype segments. Exposure requires a server application to pass attacker-controlled form data or URL parameters to a Conform parser; polluted properties can alter application data or crash the consuming process.
The record
- CVE
- CVE-2024-32866
- Published
- Apr 23, 2024
- Updated
- Aug 2, 2024
- Vendor
- Edmund Hung
- Product
- Conform
- Classifications
- CWE-1321, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 23, 2024CVE publishedPublication date reported by the CVE source.
- Aug 2, 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?
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- Affected versionversion=*
- Affected versionversion=< 1.1.1
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
- GHSA-624g-8qjg-8qxf proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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