Server-side request forgery (SSRF) In libapache2-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, 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.
Mitigation
Update Impact
Minimal update. May introduce new vulnerabilities or breaking changes.
Ecosystem | Package | Affected version | Patched versions |
|---|---|---|---|
 debian 11 | 2.4.9-1 | ||
debian 12 | 2.4.9-1 | ||
debian 13 | 2.4.9-1 | ||
debian 14 | 2.4.9-1 | ||
 rpm rhel7 | - | - | |
rpm rhel8 | 0:2.3.7-11.module+el8.6.0+14082+b6f23e95 |
Aliases