Object prototype modification via unsafe recursive merge
Published Jan 19, 2021 · Updated Sep 16, 2024
Prototype pollution in GreenSock GSAP before 3.6.0 allows remote attackers to modify inherited object properties through crafted configuration data. The _mergeDeep helper recursively assigns enumerable keys from gsap.config() or gsap.defaults() input without rejecting proto, constructor, or prototype. Exploitation requires a consuming application to pass attacker-controlled nested configuration data; the resulting prototype contamination can disrupt that JavaScript process or browser page.
Summary
What happened
Prototype pollution in GreenSock GSAP before 3.6.0 allows remote attackers to modify inherited object properties through crafted configuration data. The _mergeDeep helper recursively assigns enumerable keys from gsap.config() or gsap.defaults() input without rejecting proto, constructor, or prototype. Exploitation requires a consuming application to pass attacker-controlled nested configuration data; the resulting prototype contamination can disrupt that JavaScript process or browser page.
The record
- CVE
- CVE-2020-28478
- Published
- Jan 19, 2021
- Updated
- Sep 16, 2024
- Vendor
- GreenSock
- Product
- GSAP
- Classifications
- CWE-400, CWE-1321
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 19, 2021CVE 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=unspecified <3.6.0
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
- Snyk gsap.config prototype-pollution proof of conceptproof 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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