CVE-2023-0821 Nomad Client Vulnerable to Decompression Bombs in Artifact Block

What is CVE-2023-0821?

CVE-2023-0821 is a medium-severity denial of service vulnerability in HashiCorp Nomad, published on 16 Feb 2023. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

HashiCorp Nomad and Nomad Enterprise 1.2.15 up to 1.3.8, and 1.4.3 jobs using a maliciously compressed artifact stanza source can cause excessive disk usage. Fixed in 1.2.16, 1.3.9, and 1.4.4.

Weakness: CWE-409

Which versions are affected by CVE-2023-0821?

7 open source packages ship an affected version, including github.com/hashicorp/nomad. It affects 1 product.

Products include Hashicorp Nomad.

How do I fix CVE-2023-0821?

Upgrade github.com/hashicorp/nomad to a fixed version for your release line: 1.2.16, 1.3.9 or 1.4.4.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2023-0821 being exploited?

There is no known exploitation of CVE-2023-0821 in the wild and no public exploit code.

Other vulnerabilities in HashiCorp Nomad

• CVE-2023-1782 Nomad Unauthenticated Client Agent HTTP Request Privilege Escalation Critical 10.0
• CVE-2022-30324 Privilege escalation in Hashicorp Nomad Critical 9.8
• CVE-2020-7956 Improper Certificate Validation in HashiCorp Nomad Critical 9.8
• CVE-2019-12618 Hashicorp Nomad Access Control Issues Critical 9.8
• CVE-2020-27195 Use After Free in HashiCorp Nomad Critical 9.1

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-w479-w22g-cffh, GO-2023-1581, UBUNTU-CVE-2023-0821.