User deception via spoofed OAuth error messages
Published Oct 4, 2021 · Updated Aug 4, 2024
Content spoofing in GitLab CE/EE before 14.1.7, 14.2 through 14.2.4, and 14.3.0 allows remote attackers to mislead users via OAuth callback errors. The GitHub and Bitbucket OAuth callback endpoints render the attacker-controlled error_description parameter as a visible sign-in error without constraining its message. Exploitation requires a user to open the crafted callback URL and trust the displayed text; the reported consequence is inducement to visit a malicious website.
Summary
What happened
Content spoofing in GitLab CE/EE before 14.1.7, 14.2 through 14.2.4, and 14.3.0 allows remote attackers to mislead users via OAuth callback errors. The GitHub and Bitbucket OAuth callback endpoints render the attacker-controlled error_description parameter as a visible sign-in error without constraining its message. Exploitation requires a user to open the crafted callback URL and trust the displayed text; the reported consequence is inducement to visit a malicious website.
The record
- CVE
- CVE-2021-39873
- Published
- Oct 4, 2021
- Updated
- Aug 4, 2024
- Vendor
- GitLab
- Product
- GitLab
- Classifications
- T1566.002
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 4, 2021CVE 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, <14.1.7
- Affected versionversion=>=14.2, <14.2.5
- Affected versionversion=>=14.3, <14.3.1
What conditions does exploitation require?
What is affected?
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
- OAuth callback error_description proof of conceptproof 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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