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OAuth2 Proxy is an open-source reverse proxy and static file server that provides authentication using Providers (Google, GitHub, and others) to validate accounts by email, domain or group. In OAuth2 Proxy before version 7.0.0, for users that use the whitelist domain feature, a domain that ended in a similar way to the intended domain could have been allowed as a redirect. For example, if a whitelist domain was configured for ".example.com", the intention is that subdomains of example.com are allowed. Instead, "example.com" and "badexample.com" could also match. This is fixed in version 7.0.0 onwards. As a workaround, one can disable the whitelist domain feature and run separate OAuth2 Proxy instances for each subdomain.
Publish Date : 2021-02-02 Last Update Date : 2021-02-08
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CVSS Scores & Vulnerability Types
CVSS Score |
5.8 |
Confidentiality Impact |
Partial
(There is considerable informational disclosure.) |
Integrity Impact |
Partial
(Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.) |
Availability Impact |
None
(There is no impact to the availability of the system.) |
Access Complexity |
Medium
(The access conditions are somewhat specialized. Some preconditions must be satistified to exploit) |
Authentication |
Not required
(Authentication is not required to exploit the vulnerability.) |
Gained Access |
None |
Vulnerability Type(s) |
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CWE ID |
601 |
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Products Affected By CVE-2021-21291
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Number Of Affected Versions By Product
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References For CVE-2021-21291
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Metasploit Modules Related To CVE-2021-21291
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