Resource exhaustion in mod_auth_openidc - CVE-2021-20718

Vulnerability identifier: #VU53271

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-20718

CWE-ID: CWE-400

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

mod_auth_openidc
SUSE OpenStack Cloud Crowbar
SUSE OpenStack Cloud
SUSE Linux Enterprise Server for SAP
SUSE Linux Enterprise Server
Fedora
Oracle Essbase
apache2-mod_auth_openidc
apache2-mod_auth_openidc-debuginfo
apache2-mod_auth_openidc-debugsource
mod_auth_openidc

Install updates from vendor's website.

mod_auth_openidc - update to 2.4.7.1
Oracle Essbase - update to 21.3
apache2-mod_auth_openidc - update to 2.4.0-3.14.1
apache2-mod_auth_openidc-debuginfo - update to 2.4.0-3.14.1
apache2-mod_auth_openidc-debugsource - update to 2.4.0-3.14.1
mod_auth_openidc - addressed in versions 2.4.8.4-1.fc33, 2.4.8.4-1.fc34

• https://jvn.jp/en/jp/JVN49704918/index.html

• Denial of service in mod_auth_openidc
• Multiple vulnerabilities in Oracle Essbase
• SUSE update for apache2-mod_auth_openidc
• Fedora 34 update for mod_auth_openidc
• Fedora 33 update for mod_auth_openidc