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 mod_auth_openidc before version 2.4.9, the AES GCM encryption in mod_auth_openidc uses a static IV and AAD. It is important to fix because this creates a static nonce and since aes-gcm is a stream cipher, this can lead to known cryptographic issues, since the same key is being reused. From 2.4.9 onwards this has been patched to use dynamic values through usage of cjose AES encryption routines. References: https://github.com/zmartzone/mod_auth_openidc/security/advisories/GHSA-px3c-6x7j-3r9r https://github.com/zmartzone/mod_auth_openidc/releases/tag/v2.4.9 Upstream patch: https://github.com/zmartzone/mod_auth_openidc/commit/375407c16c61a70b56fdbe13b0d2c8f11398e92c
Created mod_auth_openidc tracking bugs for this issue: Affects: fedora-all [bug 1986396]
Attack Complexity set to High (AC:H) because hacving a static IV does not immediately leads to a loss of confidentiality. An attacker needs to intercept some encrypted messages and then perform additional work to recover the original messages.
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2022:1823 https://access.redhat.com/errata/RHSA-2022:1823
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2021-32791