Unauthenticated service termination via non-string event names
Published Sep 29, 2023 · Updated Sep 23, 2024
Improper Socket.IO event handling in NodeBB 2.8.10 and earlier allows remote attackers to terminate the forum service. The onMessage handler in src/socket.io/index.js assumes each event name is a string, so array and object values trigger uncaught TypeErrors in startsWith() or toString(). No authentication is required; repeated worker crashes within ten seconds make the cluster manager exit and keep the forum unavailable.
Summary
What happened
Improper Socket.IO event handling in NodeBB 2.8.10 and earlier allows remote attackers to terminate the forum service. The onMessage handler in src/socket.io/index.js assumes each event name is a string, so array and object values trigger uncaught TypeErrors in startsWith() or toString(). No authentication is required; repeated worker crashes within ten seconds make the cluster manager exit and keep the forum unavailable.
The record
- CVE
- CVE-2023-30591
- Published
- Sep 29, 2023
- Updated
- Sep 23, 2024
- Vendor
- NodeBB
- Product
- NodeBB
- Classifications
- CWE-241, CAPEC-153, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 29, 2023CVE publishedPublication date reported by the CVE source.
- Sep 23, 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=0 <=2.8.10
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
- Socket.IO array event-name denial-of-service proof of conceptfunctional · demonstrated
- Socket.IO object event-name denial-of-service proof of conceptfunctional · 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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