CVE-2020-5249 Information

Description

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Reference

https://github.com/puma/puma/commit/c22712fc93284a45a93f9ad7023888f3a65524f3 https://github.com/puma/puma/security/advisories/GHSA-33vf-4xgg-9r58 https://github.com/puma/puma/security/advisories/GHSA-84j7-475p-hp8v https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BMJ3CGZ3DLBJ5WUUKMI5ZFXFJQMXJZIK/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DIHVO3CQMU7BZC7FCTSRJ33YDNS3GFPK/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NJ3LL5F5QADB6LM46GXZETREAKZMQNRD/ https://owasp.org/www-community/attacks/HTTP_Response_Splitting

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

6.5