Bug 2153655 (CVE-2022-23527)

Summary: CVE-2022-23527 mod_auth_openidc: Open Redirect in oidc_validate_redirect_url() using tab character
Product: [Other] Security Response Reporter: Sandipan Roy <saroy>
Component: vulnerabilityAssignee: Nobody <nobody>
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Priority: medium    
Version: unspecifiedCC: spoore, thalman
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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An open redirect vulnerability was found in mod_auth_openidc, an OpenID Certified™ authentication and authorization module for the Apache 2.x HTTP server. 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.
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Bug Depends On: 2153656, 2153657, 2153658, 2153659    
Bug Blocks: 2153592    

Description Sandipan Roy 2022-12-15 03:47:34 UTC 
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.

https://github.com/zmartzone/mod_auth_openidc/security/advisories/GHSA-q6f2-285m-gr53
https://github.com/zmartzone/mod_auth_openidc/blob/v2.4.12.1/auth_openidc.conf#L975-L984
Comment 1 Sandipan Roy 2022-12-15 03:51:40 UTC 
Created mod_auth_openidc tracking bugs for this issue:

Affects: fedora-36 [bug 2153657]
Affects: fedora-37 [bug 2153658]
Comment 4 errata-xmlrpc 2023-11-07 08:14:27 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2023:6365 https://access.redhat.com/errata/RHSA-2023:6365
Comment 5 errata-xmlrpc 2023-11-14 15:17:05 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2023:6940 https://access.redhat.com/errata/RHSA-2023:6940