CVE-2020-5247
HTTP Response Splitting in Puma
- State
- Published
- Severity
- 6.5 Medium
- Published
- Feb 28, 2020
- Updated
- Aug 4, 2024
- Reserved
- Jan 2, 2020
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L | GitHub_M |
Weaknesses
- CWE-113 Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting')
Affected Products
| Product | Versions |
|---|---|
Pumapuma |
|
References
- https://github.com/puma/puma/security/advisories/GHSA-84j7-475p-hp8v
- https://owasp.org/www-community/attacks/HTTP_Response_Splitting
- https://www.ruby-lang.org/en/news/2019/10/01/http-response-splitting-in-webrick-cve-2019-16254
- FEDORA-2020-a3f26a9387vendor-advisory
- FEDORA-2020-fd87f90634vendor-advisory
- FEDORA-2020-08092b4c97vendor-advisory
- [debian-lts-announce] 20220525 [SECURITY] [DLA 3023-1] puma security updatemailing-list
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