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bdu:2024-07772

EUVD-2026-241350

fkie_cve-2021-41136

Puma is a HTTP 1.1 server for Ruby/Rack applications. Prior to versions 5.5.1 and 4.3.9, using `puma` with a proxy which forwards HTTP header values which contain the LF character could allow HTTP request smugggling. A client could smuggle a request through a proxy, causing the proxy to send a response back to another unknown client. The only proxy which has this behavior, as far as the Puma team is aware of, is Apache Traffic Server. If the proxy uses persistent connections and the client adds another request in via HTTP pipelining, the proxy may mistake it as the first request's body. Puma, however, would see it as two requests, and when processing the second request, send back a response that the proxy does not expect. If the proxy has reused the persistent connection to Puma to send another request for a different client, the second response from the first client will be sent to the second client. This vulnerability was patched in Puma 5.5.1 and 4.3.9. As a workaround, do not use Apache Traffic Server with `puma`.

GHSA-48w2-rm65-62xx — Puma with proxy which forwards LF characters as line endings could allow HTTP request smuggling

Affected: RubyGems: puma

### Impact

Prior to `puma` version 5.5.0, using `puma` with a proxy which forwards LF characters as line endings could allow HTTP request smuggling. A client could smuggle a request through a proxy, causing the proxy to send a response back to another unknown client.

This behavior (forwarding LF characters as line endings) is very uncommon amongst proxy servers, so we have graded the impact here as "low". Puma is only aware of a single proxy server which has this behavior.

If the proxy uses persistent connections and the client adds another request in via HTTP pipelining, the proxy may mistake it as the first request's body. Puma, however, would see it as two requests, and when processing the second request, send back a response that the proxy does not expect. If the proxy has reused the persistent connection to Puma to send another request for a different client, the second response from the first client will be sent to the second client.

### Patches

This vulnerability was patched in Puma 5.5.1 and 4.3.9.

### Workarounds

This vulnerability only affects Puma installations without any proxy in front.

Use a proxy which does not forward LF characters as line endings.

Proxies which do not forward LF characters as line endings:

* Nginx * Apache (>2.4.25) * Haproxy * Caddy * Traefik

### Possible Breakage

If you are [dealing with legacy clients that want to send `LF` as a line ending](https://stackoverflow.com/questions/43574428/have-apache-accept-lf-vs-crlf-in-request-…

gsd-2021-41136

OESA-2023-1981 — rubygem-puma security update

Affected: openEuler:20.03-LTS-SP1: rubygem-puma

A simple, fast, threaded, and highly concurrent HTTP 1.1 server for Ruby/Rack applications. Security Fix(es): Puma is a HTTP 1.1 server for Ruby/Rack applications. Prior to versions 5.5.1 and 4.3.9, using `puma` with a proxy which forwards HTTP header values which contain the LF character could allow HTTP request smugggling. A client could smuggle a request through a proxy, causing the proxy to send a response back to another unknown client. The only proxy which has this behavior, as far as the Puma team is aware of, is Apache Traffic Server. If the proxy uses persistent connections and the client adds another request in via HTTP pipelining, the proxy may mistake it as the first request's body. Puma, however, would see it as two requests, and when processing the second request, send back a response that the proxy does not expect. If the proxy has reused the persistent connection to Puma to send another request for a different client, the second response from the first client will be sent to the second client. This vulnerability was patched in Puma 5.5.1 and 4.3.9. As a workaround, do not use Apache Traffic Server with `puma`.(CVE-2021-41136)

openSUSE-SU-2024:11830-1 — ruby3.1-rubygem-puma-4-4.3.10-1.1 on GA media

ruby3.1-rubygem-puma-4-4.3.10-1.1 on GA media

RHSA-2022:5498 — Red Hat Security Advisory: Satellite 6.11 Release

libsolv: heap-based buffer overflow in testcase_read() in src/testcase.c foreman: Authenticate remote code execution through Sendmail configuration Satellite: Allow unintended SCA certificate to authenticate Candlepin netty: Information disclosure via the local system temporary directory netty: possible request smuggling in HTTP/2 due missing validation netty: Request smuggling via content-length header sidekiq: XSS via the queue name of the live-poll feature python-sqlparse: ReDoS via regular expression in StripComments filter libsolv: heap-based buffer overflow in pool_installable() in src/repo.h libsolv: heap-based buffer overflow in pool_disabled_solvable() in src/repo.h libsolv: heap-based buffer overflow in pool_installable_whatprovides() in src/repo.h libsolv: heap-based buffer overflow in prune_to_recommended() in src/policy.c rubygem-puma: Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling') in puma logback: remote code execution through JNDI call from within its configuration file netty: control chars in header names may lead to HTTP request smuggling python-lxml: HTML Cleaner allows crafted and SVG embedded scripts to pass through django: potential bypass of an upstream access control based on URL paths libsolv: heap-overflows in resolve_dependencies function django: Denial-of-service possibility in UserAttributeSimilarityValidator django: Potential information disclosure in dictsort template filter django: Potential directory-traversal via Stor…

SUSE-SU-2021:3728-1 — Security update for ardana-ansible, ardana-monasca, documentation-suse-openstack-cloud, openstack-ec2-api, openstack-he…

Security update for ardana-ansible, ardana-monasca, documentation-suse-openstack-cloud, openstack-ec2-api, openstack-heat-templates, python-Django, python-monasca-common, rubygem-redcarpet, rubygem-puma

Withdrawn: UBUNTU-CVE-2021-41136

Withdrawn by the publisher.

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