Security restrictions bypass in Nomad

1) Input validation error

EUVDB-ID: #VU99235

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: N/A

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a local user to bypass implemented security restrictions.

The vulnerability exists due to insufficient validation of case-sensitive characters in Client FS API. A local user with read-fs permissions but not alloc-exec permissions to read files from the secrets dir.

Note, the vulnerability affects installations on case-insensitive file systems, such as Windows, macOS, and Linux with obscure ext4 options enabled.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Nomad: 1.5.14 - 1.9.0

CPE2.3

• cpe:2.3:a:hashicorp:nomad:1.5.17:*:*:*:*:*:*:*
• cpe:2.3:a:hashicorp:nomad:1.6.10:*:*:*:*:*:*:*
• cpe:2.3:a:hashicorp:nomad:1.7.7:*:*:*:*:*:*:*
• cpe:2.3:a:hashicorp:nomad:1.8.4:*:*:*:*:*:*:*
• cpe:2.3:a:hashicorp:nomad:1.9.0:*:*:*:*:*:*:*

External links

https://github.com/hashicorp/nomad/releases/tag/v1.9.1
https://github.com/hashicorp/nomad/pull/24125

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.