CVE-2022-23527: Open Redirect in oidc_validate_redirect_url()
First published: Wed Dec 14 2022(Updated: )
mod_auth_openidc is an OpenID Certified™ authentication and authorization module for the Apache 2.x HTTP server. Versions prior to 2.4.12.2 are vulnerable to Open Redirect. When providing a logout parameter to the redirect URI, the existing code in oidc_validate_redirect_url() does not properly check for URLs that start with /\t, leading to an open redirect. This issue has been patched in version 2.4.12.2. Users unable to upgrade can mitigate the issue by configuring mod_auth_openidc to only allow redirection when the destination matches a given regular expression with OIDCRedirectURLsAllowed.
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Openidc Mod Auth Openidc | <2.4.12.2 | |
| Debian Debian Linux | =10.0 |
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Reference Links
Frequently Asked Questions
What is CVE-2022-23527?
CVE-2022-23527 is a vulnerability in the mod_auth_openidc module for Apache 2.x that allows for Open Redirect attacks.
What versions of mod_auth_openidc are affected by CVE-2022-23527?
Versions prior to 2.4.12.2 of mod_auth_openidc are affected by CVE-2022-23527.
What is the severity of CVE-2022-23527?
CVE-2022-23527 has a severity rating of 6.1 (Medium).
How does CVE-2022-23527 work?
CVE-2022-23527 works by not properly checking the logout parameter in the redirect URI, allowing for Open Redirect attacks.
How can I fix CVE-2022-23527?
To fix CVE-2022-23527, update mod_auth_openidc to version 2.4.12.2 or later.
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