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bdu:2024-07777

EUVD-2026-258667

fkie_cve-2024-45614

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.

GHSA-9hf4-67fc-4vf4 — Puma's header normalization allows for client to clobber proxy set headers

Affected: RubyGems: puma

### 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.

OESA-2024-2249 — rubygem-puma security update

Affected: openEuler:20.03-LTS-SP4: rubygem-puma

A simple, fast, threaded, and highly concurrent HTTP 1.1 server for Ruby/Rack applications. Security Fix(es): 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.(CVE-2024-45614)

openSUSE-SU-2024:14474-1 — ruby3.3-rubygem-puma-6.4.3-1.1 on GA media

ruby3.3-rubygem-puma-6.4.3-1.1 on GA media

SUSE-SU-2024:3644-1 — Security update for rubygem-puma

Security update for rubygem-puma

UBUNTU-CVE-2024-45614

Affected: Ubuntu:Pro:20.04:LTS: puma, Ubuntu:Pro:22.04:LTS: puma, Ubuntu:24.04:LTS: puma