🚨 [security] Upgrade puma: 3.11.4 → 3.12.6 (minor)

🚨 Your current dependencies have known security vulnerabilities 🚨

This dependency update fixes known security vulnerabilities. Please see the details below and assess their impact carefully. We recommend to merge and deploy this as soon as possible!

Here is everything you need to know about this upgrade. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ puma (3.11.4 → 3.12.6) · Repo · Changelog

Security Advisories 🚨

🚨 HTTP Smuggling via Transfer-Encoding Header in Puma

Impact

By using an invalid transfer-encoding header, an attacker could
smuggle an HTTP response.

Patches

The problem has been fixed in Puma 3.12.5 and Puma 4.3.4.

🚨 HTTP Smuggling via Transfer-Encoding Header in Puma

Impact

This is a similar but different vulnerability to the one patched in 3.12.5 and 4.3.4.

A client could smuggle a request through a proxy, causing the proxy to send a response
back to another unknown client.

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

The problem has been fixed in Puma 3.12.6 and Puma 4.3.5.

🚨 HTTP Response Splitting (Early Hints) in Puma

Impact

If an application using Puma allows untrusted input in an early-hints header,
an attacker can use a carriage return character to end the header and inject
malicious content, such as additional headers or an entirely new response body.
This vulnerability is known as HTTP Response
Splitting

While not an attack in itself, response splitting is a vector for several other
attacks, such as cross-site scripting (XSS).

This is related to CVE-2020-5247,
which fixed this vulnerability but only for regular responses.

Patches

This has been fixed in 4.3.3 and 3.12.4.

Workarounds

Users can not allow untrusted/user input in the Early Hints response header.

🚨 HTTP Response Splitting vulnerability in puma

If an application using Puma allows untrusted input in a response header,
an attacker can use newline characters (i.e. CR, LF) to end the header and
inject malicious content, such as additional headers or an entirely new
response body. This vulnerability is known as HTTP Response Splitting.

While not an attack in itself, response splitting is a vector for several
other attacks, such as cross-site scripting (XSS).

🚨 Keepalive thread overload/DoS in puma

A poorly-behaved client could use keepalive requests to monopolize
Puma's reactor and create a denial of service attack.

If more keepalive connections to Puma are opened than there are
threads available, additional connections will wait permanently if
the attacker sends requests frequently enough.

Release Notes

3.12.1

v3.12.1

Does any of this look wrong? Please let us know.

Commits

See the full diff on Github. The new version differs by more commits than we can show here.

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