Vulnerabilities > CVE-2021-32786

CVSS 6.1 - MEDIUM

Attack vector

NETWORK

Attack complexity

LOW

Privileges required

NONE

Confidentiality impact

LOW

Integrity impact

LOW

Availability impact

NONE

network

low complexity

openidc

fedoraproject

NVD

Published: 2021-07-22

Updated: 2024-11-21

Summary

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.

Vulnerable Configurations

Part	Description	Count
Application	Openidc Openidc MOD Auth Openidc - Openidc MOD Auth Openidc 1.5 Openidc MOD Auth Openidc 1.5.1 Openidc MOD Auth Openidc 1.5.2 Openidc MOD Auth Openidc 1.5.3 Openidc MOD Auth Openidc 1.5.4 Openidc MOD Auth Openidc 1.5.5 Openidc MOD Auth Openidc 1.6.0 Openidc MOD Auth Openidc 1.7.0 Openidc MOD Auth Openidc 1.7.1 Openidc MOD Auth Openidc 1.7.2 Openidc MOD Auth Openidc 1.7.3 Openidc MOD Auth Openidc 1.8.0 Openidc MOD Auth Openidc 1.8.1 Openidc MOD Auth Openidc 1.8.2 Openidc MOD Auth Openidc 1.8.3 Openidc MOD Auth Openidc 1.8.4 Openidc MOD Auth Openidc 1.8.5 Openidc MOD Auth Openidc 1.8.6 Openidc MOD Auth Openidc 1.8.7 Openidc MOD Auth Openidc 1.8.8 Openidc MOD Auth Openidc 1.8.9 Openidc MOD Auth Openidc 1.8.10 Openidc MOD Auth Openidc 1.8.10.1 Openidc MOD Auth Openidc 1.8.10.2 Openidc MOD Auth Openidc 1.8.10.3 Openidc MOD Auth Openidc 2.0.0 Openidc MOD Auth Openidc 2.1.0 Openidc MOD Auth Openidc 2.1.1 Openidc MOD Auth Openidc 2.1.2 Openidc MOD Auth Openidc 2.1.3 Openidc MOD Auth Openidc 2.1.4 Openidc MOD Auth Openidc 2.1.5 Openidc MOD Auth Openidc 2.1.6 Openidc MOD Auth Openidc 2.1.13 Openidc MOD Auth Openidc 2.2.0 Openidc MOD Auth Openidc 2.3.0 Openidc MOD Auth Openidc 2.3.1 Openidc MOD Auth Openidc 2.3.2 Openidc MOD Auth Openidc 2.3.3 Openidc MOD Auth Openidc 2.3.4 Openidc MOD Auth Openidc 2.3.5 Openidc MOD Auth Openidc 2.3.6 Openidc MOD Auth Openidc 2.3.7 Openidc MOD Auth Openidc 2.3.8 Openidc MOD Auth Openidc 2.3.9 Openidc MOD Auth Openidc 2.3.10 Openidc MOD Auth Openidc 2.3.10.1 Openidc MOD Auth Openidc 2.3.10.2 Openidc MOD Auth Openidc 2.3.11 Openidc MOD Auth Openidc 2.4.0 Openidc MOD Auth Openidc 2.4.0.1 Openidc MOD Auth Openidc 2.4.0.2 Openidc MOD Auth Openidc 2.4.0.3 Openidc MOD Auth Openidc 2.4.0.4 Openidc MOD Auth Openidc 2.4.1 Openidc MOD Auth Openidc 2.4.2 Openidc MOD Auth Openidc 2.4.2.1 Openidc MOD Auth Openidc 2.4.3 Openidc MOD Auth Openidc 2.4.4 Openidc MOD Auth Openidc 2.4.4.1 Openidc MOD Auth Openidc 2.4.5 Openidc MOD Auth Openidc 2.4.6 Openidc MOD Auth Openidc 2.4.7 Openidc MOD Auth Openidc 2.4.7.1 Openidc MOD Auth Openidc 2.4.7.2 Openidc MOD Auth Openidc 2.4.8.1 Openidc MOD Auth Openidc 2.4.8.2 Openidc MOD Auth Openidc 2.4.8.3 Openidc MOD Auth Openidc 2.4.8.4	78
Application	Apache Apache Http Server *	1
OS	Fedoraproject Fedoraproject Fedora 33 Fedoraproject Fedora 34	2

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Summary

Vulnerable Configurations

References

Vulnerabilities > CVE-2021-32786