Open redirect via protocol-relative request paths
Published May 17, 2021 · Updated Sep 16, 2024
Open redirect in Verdens Gang AS koa-remove-trailing-slashes before 2.0.2 allows remote attackers to redirect users via crafted request paths. The removeTrailingSlashes function passed a leading double-slash path and query directly to ctx.redirect without verifying that the destination retained the request origin. Exploitation requires a user to request an affected endpoint and follow its redirect, enabling navigation to an attacker-controlled origin.
Summary
What happened
Open redirect in Verdens Gang AS koa-remove-trailing-slashes before 2.0.2 allows remote attackers to redirect users via crafted request paths. The removeTrailingSlashes function passed a leading double-slash path and query directly to ctx.redirect without verifying that the destination retained the request origin. Exploitation requires a user to request an affected endpoint and follow its redirect, enabling navigation to an attacker-controlled origin.
The record
- CVE
- CVE-2021-23384
- Published
- May 17, 2021
- Updated
- Sep 16, 2024
- Vendor
- Verdens Gang AS
- Product
- koa-remove-trailing-slashes
- Classifications
- CWE-601, T1204.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 17, 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 <2.0.2
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
- Protocol-relative path redirect requestproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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