Authorization header disclosure via cross-host redirects
Published Apr 29, 2020 · Updated Aug 4, 2024
Information disclosure in GitHub @actions/http-client before 1.0.8 allows attackers to obtain Authorization headers via cross-host redirects. HttpClient reused the original headers when preparing a redirected request without comparing hostnames and deleting the case-insensitive Authorization field. Exposure requires a request carrying an Authorization header, a 302 response, and a redirect to a different hostname; the destination receives the credential.
Summary
What happened
Information disclosure in GitHub @actions/http-client before 1.0.8 allows attackers to obtain Authorization headers via cross-host redirects. HttpClient reused the original headers when preparing a redirected request without comparing hostnames and deleting the case-insensitive Authorization field. Exposure requires a request carrying an Authorization header, a 302 response, and a redirect to a different hostname; the destination receives the credential.
The record
- CVE
- CVE-2020-11021
- Published
- Apr 29, 2020
- Updated
- Aug 4, 2024
- Vendor
- GitHub
- Product
- @actions/http-client
- Classifications
- Unavailable
- Attack vector
- network
- Privileges
- Unavailable
Timeline
How it unfolded
- Apr 29, 2020CVE publishedPublication date reported by the CVE source.
- Aug 4, 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=< 1.0.8
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
No sourced classifications are available.
Public exploit references
- Cross-host redirect regression testproof 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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