Code execution via unsafe __proto__ assignment
Published Feb 4, 2020 · Updated Aug 4, 2024
Prototype pollution in Luke Edwards Klona 1.1.0 and earlier allows remote attackers to execute code or interrupt applications. The object-cloning loop assigns an enumerable proto key directly to a fresh object, invoking the prototype setter instead of creating a data property. Exploitation requires an application to pass attacker-controlled objects into Klona and then consume a polluted property through a code-execution or denial-of-service gadget.
Summary
What happened
Prototype pollution in Luke Edwards Klona 1.1.0 and earlier allows remote attackers to execute code or interrupt applications. The object-cloning loop assigns an enumerable proto key directly to a fresh object, invoking the prototype setter instead of creating a data property. Exploitation requires an application to pass attacker-controlled objects into Klona and then consume a polluted property through a code-execution or denial-of-service gadget.
The record
- CVE
- CVE-2020-8125
- Published
- Feb 4, 2020
- Updated
- Aug 4, 2024
- Vendor
- Luke Edwards
- Product
- Klona
- Classifications
- CWE-20
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 4, 2020CVE publishedPublication date reported by the CVE source.
- Aug 4, 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=Fixed Version: v1.1.1
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
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
- Upstream __proto__ regression payloadproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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