CVE-2024-45614 – puma

Package

Manager: gem
Name: puma
Vulnerable Version: >=0 <5.6.9 || >=6.0.0 <6.4.3

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

CVSS v4.0: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

EPSS: 0.00072 pctl0.22581

Details

Puma's header normalization allows for client to clobber proxy set headers ### Impact 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 trusting headers set by their proxy may be affected. Attackers may be able to downgrade connections to HTTP (non-SSL) or redirect responses, which could cause confidentiality leaks if combined with a separate MITM attack. ### Patches 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. ### Workarounds Nginx has a [underscores_in_headers](https://nginx.org/en/docs/http/ngx_http_core_module.html#underscores_in_headers) configuration variable to discard these headers at the proxy level. Any users that are implicitly trusting the proxy defined headers for security or availability should immediately cease doing so until upgraded to the fixed versions.

Metadata

Created: 2024-09-20T14:40:16Z
Modified: 2024-09-20T22:12:43Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/09/GHSA-9hf4-67fc-4vf4/GHSA-9hf4-67fc-4vf4.json
CWE IDs: ["CWE-444", "CWE-639"]
Alternative ID: GHSA-9hf4-67fc-4vf4
Finding: F110
Auto approve: 1