Application hang via referrer hostname regex
Published Aug 1, 2022 · Updated Aug 3, 2024
Regular expression denial of service in node-fetch 3.0.0 through 3.2.9 allows remote attackers to hang Node.js applications via crafted referrer URLs. The isOriginPotentiallyTrustworthy() function in src/utils/referrer.js applies a nested, backtracking hostname regular expression to the URL host. An application must pass attacker-controlled referrer input to fetch(); alternating letters and periods drive excessive CPU use and block its event loop.
Summary
What happened
Regular expression denial of service in node-fetch 3.0.0 through 3.2.9 allows remote attackers to hang Node.js applications via crafted referrer URLs. The isOriginPotentiallyTrustworthy() function in src/utils/referrer.js applies a nested, backtracking hostname regular expression to the URL host. An application must pass attacker-controlled referrer input to fetch(); alternating letters and periods drive excessive CPU use and block its event loop.
The record
- CVE
- CVE-2022-2596
- Published
- Aug 1, 2022
- Updated
- Aug 3, 2024
- Vendor
- node-fetch
- Product
- node-fetch
- Classifications
- CWE-1333, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 1, 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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Is a vulnerable build present?
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- Affected versionversion=3.0.0 <unspecified
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
- Snyk ReDoS proof of conceptproof of concept · unverified
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Technologies
Your stack
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Your stack
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