Resource exhaustion in Unbound - CVE-2022-3204

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Main Vulnerability Database Vulnerabilities #VU69407

Resource exhaustion in Unbound - CVE-2022-3204

Published: November 18, 2022


Vulnerability identifier: #VU69407
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-2022-3204
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

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 when processing a malicious delegation with a considerable number of non responsive nameservers. A remote attacker can trigger CPU high usage and perform a denial of service (DoS) attack.

The attack is known as "Non-Responsive Delegation Attack" (NRDelegation Attack).


Affected software

Unbound
Gentoo Linux
Amazon Linux AMI
Oracle Linux
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Manager Server
SUSE Manager Retail Branch Server
SUSE Manager Proxy
SUSE Linux Enterprise Micro
SUSE Enterprise Storage
Anolis OS
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Oracle Solaris
SUSE Linux Enterprise Server 15 SP2 LTSS
SUSE Linux Enterprise High Performance Computing 15 SP2 LTSS
SUSE Linux Enterprise Server 15 SP3 LTSS
SUSE Linux Enterprise Desktop 15 SP4 LTSS
SUSE Linux Enterprise Server 15 SP4 LTSS
Basesystem Module
SUSE Package Hub 15
openSUSE Leap
Ubuntu
openEuler
Fedora
Red Hat Advanced Cluster Management for Kubernetes
Red Hat OpenShift Container Platform
LANTIME Operating System Firmware (LTOS)
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
unbound (Ubuntu package)
libunbound2 (Ubuntu package)
unbound (Red Hat package)
libunbound8 (Ubuntu package)
unbound-debuginfo
unbound-devel
unbound-debugsource
python3-unbound
unbound-libs
unbound-help
unbound
net-dns/unbound
unbound-munin
unbound-python
unbound-python-debuginfo
libunbound8-debuginfo
unbound-anchor
unbound-anchor-debuginfo
libunbound8
libunbound-devel-mini
libunbound-devel-mini-debugsource
libunbound-devel-mini-debuginfo
cflinuxfs3
Robotic Process Automation for Cloud Pak
OpenShift Service Mesh

How to mitigate CVE-2022-3204

Install updates from vendor's website.

Unbound - update to 1.16.3
Red Hat Advanced Cluster Management for Kubernetes - update to 2.5.9
Red Hat OpenShift Container Platform - update to 4.13.2
LANTIME Operating System Firmware (LTOS) - update to 7.08.011
cflinuxfs3 - update to 0.336.0
unbound (Ubuntu package) - addressed in versions 1.6.7-1ubuntu2.6, 1.9.4-2ubuntu1.4, 1.13.1-1ubuntu5.3, 1.16.2-1ubuntu0.1
libunbound2 (Ubuntu package) - update to 1.6.7-1ubuntu2.6
unbound (Red Hat package) - addressed in versions 1.7.3-17.el8_6.5, 1.16.2-3.el9, 1.16.2-5.el8
libunbound8 (Ubuntu package) - addressed in versions 1.9.4-2ubuntu1.4, 1.13.1-1ubuntu5.3, 1.16.2-1ubuntu0.1
unbound-debuginfo - update to 1.11.0-9
unbound-devel - update to 1.11.0-9
unbound-debugsource - update to 1.11.0-9
python3-unbound - update to 1.11.0-9
unbound-libs - update to 1.11.0-9
unbound-help - update to 1.11.0-9
unbound - update to 1.11.0-9
python3-unbound - update to 1.16.2-3
unbound-devel - update to 1.16.2-3
unbound-libs - update to 1.16.2-3
unbound - update to 1.16.2-3
net-dns/unbound - update to 1.16.3
unbound - addressed in versions 1.16.3-1.fc35, 1.16.3-1.fc36, 1.16.3-1.fc37
unbound - update to 1.16.3-2
unbound-munin - addressed in versions 1.20.0-150100.10.13.1, 1.20.0-150600.23.3.1
unbound-python - addressed in versions 1.20.0-150100.10.13.1, 1.20.0-150600.23.3.1
unbound - addressed in versions 1.20.0-150100.10.13.1, 1.20.0-150600.23.3.1
unbound-python-debuginfo - addressed in versions 1.20.0-150100.10.13.1, 1.20.0-150600.23.3.1
libunbound8-debuginfo - addressed in versions 1.20.0-150100.10.13.1, 1.20.0-150600.23.3.1
unbound-anchor - addressed in versions 1.20.0-150100.10.13.1, 1.20.0-150600.23.3.1
unbound-anchor-debuginfo - addressed in versions 1.20.0-150100.10.13.1, 1.20.0-150600.23.3.1
unbound-debuginfo - addressed in versions 1.20.0-150100.10.13.1, 1.20.0-150600.23.3.1
unbound-debugsource - addressed in versions 1.20.0-150100.10.13.1, 1.20.0-150600.23.3.1
libunbound8 - addressed in versions 1.20.0-150100.10.13.1, 1.20.0-150600.23.3.1
unbound-devel - addressed in versions 1.20.0-150100.10.13.1, 1.20.0-150600.23.3.1
libunbound-devel-mini - update to 1.20.0-150600.23.3.1
libunbound-devel-mini-debugsource - update to 1.20.0-150600.23.3.1
libunbound-devel-mini-debuginfo - update to 1.20.0-150600.23.3.1
OpenShift Service Mesh - update to 2.4.0
Robotic Process Automation for Cloud Pak - update to 21.0.6

External References

Related Security Bulletins