SB2020030309 - Multiple vulnerabilities in Puma web server for Ruby

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) HTTP response splitting (CVE-ID: CVE-2020-5247)

The vulnerability allows a remote attacker to perform HTTP splitting attacks.

The vulnerability exists due to software does not corrector process CRLF character sequences in a response header. A remote attacker can send specially crafted request containing CRLF sequence and make the application to send a split HTTP response.

Successful exploitation of the vulnerability may allow an attacker perform cache poisoning attack.

2) HTTP response splitting (CVE-ID: CVE-2020-5249)

The vulnerability allows a remote attacker to perform HTTP splitting attacks.

The vulnerability exists due to software does not corrector process CRLF character sequences in an early-hints header. A remote attacker can send specially crafted request containing CRLF sequence and make the application to send a split HTTP response.

Successful exploitation of the vulnerability may allow an attacker perform cache poisoning attack.

Note: This is related to CVE-2020-5247, which fixed this vulnerability but only for regular responses.

Remediation

Install update from vendor's website.

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
• https://github.com/puma/puma/commit/c22712fc93284a45a93f9ad7023888f3a65524f3
• https://github.com/puma/puma/security/advisories/GHSA-33vf-4xgg-9r58