Reusing a Nonce Affecting mod_auth_openidc:2.3/mod_auth_openidc package, versions <0:2.3.7-11.module_el8.6.0+2868+44838709


Severity

Recommended
0.0
medium
0
10

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.21% (60th percentile)

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  • Snyk IDSNYK-ALMALINUX8-MODAUTHOPENIDC-5630206
  • published28 May 2023
  • disclosed10 May 2022

Introduced: 10 May 2022

CVE-2021-32791  (opens in a new tab)
CWE-323  (opens in a new tab)
CWE-330  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:8 mod_auth_openidc:2.3/mod_auth_openidc to version 0:2.3.7-11.module_el8.6.0+2868+44838709 or higher.
This issue was patched in ALSA-2022:1823.

NVD Description

Note: Versions mentioned in the description apply only to the upstream mod_auth_openidc:2.3/mod_auth_openidc package and not the mod_auth_openidc:2.3/mod_auth_openidc package as distributed by AlmaLinux. See How to fix? for AlmaLinux:8 relevant fixed versions and status.

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.

CVSS Scores

version 3.1