Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Puma | Puma | < 5.6.9 |
Related Weaknesses (CWE)
References
- https://github.com/puma/puma/security/advisories/GHSA-9hf4-67fc-4vf4Vendor Advisory
- https://nginx.org/en/docs/http/ngx_http_core_module.html#underscores_in_headersProduct
- https://lists.debian.org/debian-lts-announce/2024/11/msg00004.html
FAQ
What is CVE-2024-45614?
CVE-2024-45614 is a vulnerability with a CVSS score of 5.4 (MEDIUM). 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 s...
How severe is CVE-2024-45614?
CVE-2024-45614 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2024-45614?
Check the references section above for vendor advisories and patch information. Affected products include: Puma Puma.