VYPR
← All advisories
Moderate severityNVD Advisory· Published Feb 28, 2020· Updated Aug 4, 2024

HTTP Response Splitting in Puma

CVE-2020-5247

Description

In Puma (RubyGem) before 4.3.2 and before 3.12.3, if an application using Puma allows untrusted input in a response header, an attacker can use newline characters (i.e. CR, LF or/r, /n) 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-2019-16254, which fixed this vulnerability for the WEBrick Ruby web server. This has been fixed in versions 4.3.2 and 3.12.3 by checking all headers for line endings and rejecting headers with those characters.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
pumaRubyGems
< 3.12.43.12.4
pumaRubyGems
>= 4.0.0, < 4.3.34.3.3

Affected products

246

Patches

Vulnerability mechanics

References

14

News mentions

0

No linked articles in our index yet.