10
CVSSv3

CVE-2021-32637

Published: 28/05/2021 Updated: 09/06/2021
CVSS v2 Base Score: 7.5 | Impact Score: 6.4 | Exploitability Score: 10
CVSS v3 Base Score: 10 | Impact Score: 6 | Exploitability Score: 3.9
VMScore: 670
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P

Vulnerability Summary

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.

Vulnerability Trend

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authelia authelia

Github Repositories

The LinuxServerio team brings you another container release featuring: regular and timely application updates easy user mappings (PGID, PUID) custom base image with s6 overlay weekly base OS updates with common layers across the entire LinuxServerio ecosystem to minimise space usage, down time and bandwidth regular security updates Find us at: Blog - all the things you can

The LinuxServerio team brings you another container release featuring: regular and timely application updates easy user mappings (PGID, PUID) custom base image with s6 overlay weekly base OS updates with common layers across the entire LinuxServerio ecosystem to minimise space usage, down time and bandwidth regular security updates Find us at: Blog - all the things you can

Nginx webserver and reverse proxy with php support and a built-in Certbot (Let's Encrypt) client. It also contains fail2ban for intrusion prevention.

The LinuxServerio team brings you another container release featuring: regular and timely application updates easy user mappings (PGID, PUID) custom base image with s6 overlay weekly base OS updates with common layers across the entire LinuxServerio ecosystem to minimise space usage, down time and bandwidth regular security updates Find us at: Blog - all the things you can

The LinuxServerio team brings you another container release featuring: regular and timely application updates easy user mappings (PGID, PUID) custom base image with s6 overlay weekly base OS updates with common layers across the entire LinuxServerio ecosystem to minimise space usage, down time and bandwidth regular security updates Find us at: Blog - all the things you can

Nginx webserver and reverse proxy with php support and a built-in Certbot (Let's Encrypt) client. It also contains fail2ban for intrusion prevention.

The LinuxServerio team brings you another container release featuring: regular and timely application updates easy user mappings (PGID, PUID) custom base image with s6 overlay weekly base OS updates with common layers across the entire LinuxServerio ecosystem to minimise space usage, down time and bandwidth regular security updates Find us at: Blog - all the things you can