Vulnerabilities > CVE-2021-32786 - Open Redirect vulnerability in multiple products

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

CWE-601

NVD

Published: 2021-07-22

Updated: 2023-11-07

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

Common Weakness Enumeration (CWE)

CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

Common Attack Pattern Enumeration and Classification (CAPEC)

Fake the Source of Data
An adversary provides data under a falsified identity. The purpose of using the falsified identity may be to prevent traceability of the provided data or it might be an attempt by the adversary to assume the rights granted to another identity. One of the simplest forms of this attack would be the creation of an email message with a modified "From" field in order to appear that the message was sent from someone other than the actual sender. Results of the attack vary depending on the details of the attack, but common results include privilege escalation, obfuscation of other attacks, and data corruption/manipulation.

Summary

Vulnerable Configurations

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

References