Improper Privilege Management Affecting nixos/nix package, versions [,2.18.0)[,2.19.0)[,2.20.0)[,2.21.0)[,2.22.0)[,2.23.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-NIXOSNIX-7411841
- published28 Jun 2024
- disclosed28 Jun 2024
- creditUnknown
Introduced: 28 Jun 2024
CVE-2024-38531 (opens in a new tab)How to fix?
Upgrade nixos/nix to version 2.18.0, 2.19.0, 2.20.0, 2.21.0, 2.22.0, 2.23.0 or higher.
Overview
Affected versions of this package are vulnerable to Improper Privilege Management through the build process. An attacker can escalate privileges and hijack all future builds by creating a setuid binary in a globally accessible location and assuming the permissions of a Nix daemon worker.
Notes:
The following conditions must be met:
The local user has access to the Nix daemon.
Seccomp is disabled, meaning that the sandbox is disabled or
filter-syscallsif set to false on Linux, or seccomp is ineffective.
Workaround
If Nix version is >= 2.22, set build-dir to a location that is only accessible by root( #10312 )
Run your Nix daemon with
$TMPDIRset to a location only accessible by root.