Description

Authelia 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.

Severity

 

CVSS Version 3.x CVSS Version 2.0

CVSS 3.x Severity and Metrics:

CNA:  GitHub, Inc.

Base Score:  10.0 CRITICAL

Vector:  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: The NVD and the CNA have provided the same score. When this occurs only the CNA information is displayed, but the Acceptance Level icon for the CNA is given a checkmark to signify NVD concurrence.

CVSS 2.0 Severity and Metrics:

NIST: NVD

Base Score:  7.5 HIGH

Vector:  (AV:N/AC:L/Au:N/C:P/I:P/A:P)

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

References to Advisories, Solutions, and Tools

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Hyperlink	Resource
https://github.com/authelia/authelia/commit/c62dbd43d6e69ae81530e7c4f8763857f8ff1dda	Patch  Third Party Advisory
https://github.com/authelia/authelia/security/advisories/GHSA-68wm-pfjf-wqp6	Exploit  Mitigation  Patch  Third Party Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-287	Improper Authentication	GitHub, Inc.

Known Affected Software Configurations Switch to CPE 2.2

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Change History

1 change records found show changes

Initial Analysis by NIST 6/09/2021 12:36:44 PM

Action	Type	Old Value	New Value
Added	CPE Configuration		OR *cpe:2.3:a:authelia:authelia:*:*:*:*:*:*:*:* versions from (including) 4.0.0 up to (excluding) 4.25.1 *cpe:2.3:a:authelia:authelia:*:*:*:*:*:*:*:* versions from (including) 4.26.0 up to (excluding) 4.29.3
Added	CVSS V2		NIST (AV:N/AC:L/Au:N/C:P/I:P/A:P)
Added	CVSS V3.1		NIST AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Changed	Reference Type	https://github.com/authelia/authelia/commit/c62dbd43d6e69ae81530e7c4f8763857f8ff1dda No Types Assigned	https://github.com/authelia/authelia/commit/c62dbd43d6e69ae81530e7c4f8763857f8ff1dda Patch, Third Party Advisory
Changed	Reference Type	https://github.com/authelia/authelia/security/advisories/GHSA-68wm-pfjf-wqp6 No Types Assigned	https://github.com/authelia/authelia/security/advisories/GHSA-68wm-pfjf-wqp6 Exploit, Mitigation, Patch, Third Party Advisory