title: URL Redirection to Untrusted Site ('Open Redirect') in mod_auth_openidc
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 2.4.9.4, the 3rd-party init SSO functionality of mod_auth_openidc was reported to be vulnerable to an open redirect attack by supplying a crafted URL in the `target_link_uri` parameter. A patch in version 2.4.9.4 made it so that the `OIDCRedirectURLsAllowed` setting must be applied to the `target_link_uri` parameter. There are no known workarounds aside from upgrading to a patched version.
problem types: CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
affected:
{
vendor: zmartzone
product: mod_auth_openidc
versions:
version: <=2.4.9.3, status: affected
}
metrics:
cvssV3_1: [
version: 3.1
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
attackVector: NETWORK
attackComplexity: LOW
privilegesRequired: NONE
userInteraction: REQUIRED
scope: CHANGED
confidentialityImpact: NONE
integrityImpact: LOW
availabilityImpact: NONE
baseScore: 4.7
baseSeverity: MEDIUM
]