Auth bypass in Nixos Hydra
CVE-2024-45049
Hydra is a Continuous Integration service for Nix based projects. It is possible to trigger evaluations in Hydra without any authentication. Depending on the size of evaluations, this can impact the availability of systems. The problem can be fixed by applying https://github.com/NixOS/hydra/commit/f73043378907c2c7e44f633ad764c8bdd1c947d5 to any Hydra package. Users are advised to upgrade. Users unable to upgrade should deny the `/api/push` route in a reverse proxy. This also breaks the "Evaluate jobset" button in the frontend.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Nixos Hydra — versions < f73043378907c2c7e44f633ad764c8bdd1c947d5
Weakness classification (CWE)
References
- github.com/NixOS/hydra/security/advisories/GHSA-xv29-v93r-2f5v (Patch, Vendor Advisory)
- github.com/NixOS/nixpkgs/pull/337766 (Patch, Issue Tracking)
- github.com/NixOS/hydra/commit/f73043378907c2c7e44f633ad764c8bdd1c947d5 (Patch)
- mastodon.delroth.net/@delroth/113029832631860419 (Third Party Advisory)
Frequently asked questions
- What is CVE-2024-45049?
- CVE-2024-45049 is a high-severity vulnerability in Nixos Hydra, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2024-08-27.
- How severe is CVE-2024-45049?
- High severity. CVSS v3 base score is 7.5 out of 10.