CVE-2024-45614
Description
Puma is a Ruby/Rack web server built for parallelism. In affected versions clients could clobber values set by intermediate proxies (such as X-Forwarded-For) by providing a underscore version of the same header (X-Forwarded_For). Any users relying on proxy set variables is affected. v6.4.3/v5.6.9 now discards any headers using underscores if the non-underscore version also exists. Effectively, allowing the proxy defined headers to always win. Users are advised to upgrade. Nginx has a underscores_in_headers configuration variable to discard these headers at the proxy level as a mitigation. Any users that are implicitly trusting the proxy defined headers for security should immediately cease doing so until upgraded to the fixed versions.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 5.6.5-3+deb12u1 |
| debian | bullseye | fixed | 4.3.8-1+deb11u3 |
| debian | forky | fixed | 6.4.3-1 |
| debian | sid | fixed | 6.4.3-1 |
| debian | trixie | fixed | 6.4.3-1 |
References
- https://github.com/puma/puma/security/advisories/GHSA-9hf4-67fc-4vf4
- https://www.suse.com/security/cve/CVE-2024-45614.html
- https://nvd.nist.gov/vuln/detail/CVE-2024-45614
- https://github.com/puma/puma/commit/cac3fd18cf29ed43719ff5d52d9cfec215f0a043
- https://github.com/puma/puma/commit/f196b23be24712fb8fb16051cc124798cc84f70e
- https://github.com/puma/puma
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/puma/CVE-2024-45614.yml
- https://lists.debian.org/debian-lts-announce/2024/11/msg00004.html
- https://nginx.org/en/docs/http/ngx_http_core_module.html#underscores_in_headers
- https://security-tracker.debian.org/tracker/CVE-2024-45614
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.