Prototype pollution via unchecked __proto__ table assignment
Published Jul 25, 2022 · Updated Sep 16, 2024
Prototype pollution in Lepzulnag ion-parser 0.5.2 and earlier allows remote attackers to modify Object.prototype via crafted TOML input. The parse function accepts a [proto] table and assigns its attacker-controlled properties through the inherited proto accessor without rejecting that special key. The host application must pass attacker-controlled configuration text to parse; the resulting inherited properties affect other objects, while further security impact requires a suitable application gadget.
Summary
What happened
Prototype pollution in Lepzulnag ion-parser 0.5.2 and earlier allows remote attackers to modify Object.prototype via crafted TOML input. The parse function accepts a [proto] table and assigns its attacker-controlled properties through the inherited proto accessor without rejecting that special key. The host application must pass attacker-controlled configuration text to parse; the resulting inherited properties affect other objects, while further security impact requires a suitable application gadget.
The record
- CVE
- CVE-2020-28462
- Published
- Jul 25, 2022
- Updated
- Sep 16, 2024
- Vendor
- Lepzulnag
- Product
- ion-parser
- Classifications
- CWE-1321
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 25, 2022CVE publishedPublication date reported by the CVE source.
- Sep 16, 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=0 <unspecified
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.
Weakness, pattern, technique
Public exploit references
- Snyk ion-parser prototype-pollution proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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