CVE-2020-7956 Improper Certificate Validation in HashiCorp Nomad

What is CVE-2020-7956?

CVE-2020-7956 is a critical authentication bypass vulnerability in n/a, published on 31 Jan 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

HashiCorp Nomad and Nomad Enterprise up to 0.10.2 incorrectly validated role/region associated with TLS certificates used for mTLS RPC, and were susceptible to privilege escalation. Fixed in 0.10.3.

Weakness: CWE-295

Which versions are affected by CVE-2020-7956?

3 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-2020-7956?

Upgrade github.com/hashicorp/nomad to 0.10.3 or later.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2020-7956 being exploited?

There is no known exploitation of CVE-2020-7956 in the wild and no public exploit code.

Other vulnerabilities in n/a

• 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-2019-12618 Hashicorp Nomad Access Control Issues Critical 9.8
• CVE-2020-27195 Use After Free in HashiCorp Nomad Critical 9.1
• CVE-2021-43415 Improper Authentication in HashiCorp Nomad High 8.8

Sources

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

Also known as GHSA-cj2h-ww36-v932, GO-2022-0821, UBUNTU-CVE-2020-7956.