CVE-2021-32637

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Summary

CVECVE-2021-32637
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-05-28 17:15:00 UTC
Updated2021-06-09 16:36:00 UTC
DescriptionAuthelia is a a single sign-on multi-factor portal for web apps. This affects uses who are using nginx ngx_http_auth_request_module with Authelia, it allows a malicious individual who crafts a malformed HTTP request to bypass the authentication mechanism. It additionally could theoretically affect other proxy servers, but all of the ones we officially support except nginx do not allow malformed URI paths. The problem is rectified entirely in v4.29.3. As this patch is relatively straightforward we can back port this to any version upon request. Alternatively we are supplying a git patch to 4.25.1 which should be relatively straightforward to apply to any version, the git patches for specific versions can be found in the references. The most relevant workaround is upgrading. You can also add a block which fails requests that contains a malformed URI in the internal location block.

Risk And Classification

Problem Types: CWE-287

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Authelia Authelia All All All All

References

ReferenceSourceLinkTags
Authentication bypassed with malformed request URI on nginx · Advisory · authelia/authelia · GitHub CONFIRM github.com
fix(handlers): align response status codes for the verify endpoint (#… · authelia/authelia@c62dbd4 · GitHub MISC github.com
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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