Interpreter crash via recursive array conversion
Published Jun 21, 2022 · Updated Aug 3, 2024
Use-after-free in array conversion in NGINX njs 0.7.2 allows local users to crash the interpreter with crafted JavaScript. The fast-to-slow array conversion lacks a reentrancy guard, so a recursive Object.defineProperty descriptor starts a second conversion after the array is already marked slow and triggers an invalid read. Execution of attacker-controlled JavaScript through the njs shell or an embedding application is required; the demonstrated consequence is process termination without data disclosure or modification.
Summary
What happened
Use-after-free in array conversion in NGINX njs 0.7.2 allows local users to crash the interpreter with crafted JavaScript. The fast-to-slow array conversion lacks a reentrancy guard, so a recursive Object.defineProperty descriptor starts a second conversion after the array is already marked slow and triggers an invalid read. Execution of attacker-controlled JavaScript through the njs shell or an embedding application is required; the demonstrated consequence is process termination without data disclosure or modification.
The record
- CVE
- CVE-2022-31306
- Published
- Jun 21, 2022
- Updated
- Aug 3, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-416, T1499.004
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 21, 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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What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
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.
Public exploit references
- Recursive property-descriptor crash proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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