CVE-2020-5249

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.

References

https://owasp.org/www-community/attacks/HTTP_Response_Splitting

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NJ3LL5F5QADB6LM46GXZETREAKZMQNRD/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DIHVO3CQMU7BZC7FCTSRJ33YDNS3GFPK/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BMJ3CGZ3DLBJ5WUUKMI5ZFXFJQMXJZIK/

https://github.com/puma/puma/security/advisories/GHSA-84j7-475p-hp8v

https://github.com/puma/puma/security/advisories/GHSA-33vf-4xgg-9r58

https://github.com/puma/puma/commit/c22712fc93284a45a93f9ad7023888f3a65524f3

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3