CVE-2021-32786

 

Published at: - 23-07-2021 12:15

Last modified: - 10-05-2022 08:02

Total changes: - 10

Description

mod_auth_openidc is an authentication/authorization module for the Apache 2.x HTTP server that functions as an OpenID Connect Relying Party, authenticating users against an OpenID Connect Provider. In versions prior to 2.4.9, `oidc_validate_redirect_url()` does not parse URLs the same way as most browsers do. As a result, this function can be bypassed and leads to an Open Redirect vulnerability in the logout functionality. This bug has been fixed in version 2.4.9 by replacing any backslash of the URL to redirect with slashes to address a particular breaking change between the different specifications (RFC2396 / RFC3986 and WHATWG). As a workaround, this vulnerability can be mitigated by configuring `mod_auth_openidc` to only allow redirection whose destination matches a given regular expression.

Common Vulnerability Scoring System (CVSS)

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

 

Verification logic

 

Reference

• https://daniel.haxx.se/blog/2017/01/30/one-url-standard-please/
• https://github.com/zmartzone/mod_auth_openidc/releases/tag/v2.4.9
• https://github.com/zmartzone/mod_auth_openidc/commit/3a115484eb927bc6daa5737dd84f88ff4bbc5544
• https://github.com/zmartzone/mod_auth_openidc/security/advisories/GHSA-xm4c-5wm5-jqv7
• FEDORA-2021-17f5cedf66-Mailing List, Third Party Advisory
• FEDORA-2021-e3017c538a-Mailing List, Third Party Advisory
• https://security.netapp.com/advisory/ntap-20210902-0001/
• https://www.oracle.com/security-alerts/cpuapr2022.html

 

Keywords

NVD

 

CVE-2021-32786

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures