HTTP Response Splitting (Early Hints) in Puma

中 6.5CVE-2020-5249 · GHSA-33vf-4xgg-9r58 · 02/03/2020 公開 · 17/06/2026 更新

パッケージ	影響を受けるバージョン	修正済みバージョン
puma RubyGems	`≥ 4.0.0, < 4.3.3< 3.12.4`	`4.3.33.12.4`
puma puma	`≥ 4.0.0, ≤ 4.3.2≤ 3.12.3`	修正版なし

概要

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.

For more information

If you have any questions or comments about this advisory:

Open an issue in puma
Email us a project maintainer. Email addresses are listed in our Code of Conduct.

NVD の説明

In Puma (RubyGem) before 4.3.3 and 3.12.4, 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. This has been fixed in 4.3.3 and 3.12.4.