HTTP Response Splitting in Puma
CVE-2020-5247

6.5MEDIUM

Key Information:

Vendor

Puma

Status
Puma
Vendor
CVE Published:
28 February 2020

What is CVE-2020-5247?

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.

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Affected Version(s)

Puma < 3.12.3 < 3.12.3

Puma >= 4.0.0, < 4.3.2 < 4.0.0, 4.3.2

References

https://github.com/puma/puma/security/advisories/GHSA-84j...
x_refsource_CONFIRM
https://owasp.org/www-community/attacks/HTTP_Response_Spl...
x_refsource_MISC
https://www.ruby-lang.org/en/news/2019/10/01/http-respons...
x_refsource_MISC

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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