CVE-2019-16254 Information

Description

Ruby through 2.4.7 2.5.x through 2.5.6 and 2.6.x through 2.6.4 allows HTTP Response Splitting. If a program using WEBrick inserts untrusted input into the response header an attacker can exploit it to insert a newline character to split a header and inject malicious content to deceive clients. NOTE: this issue exists because of an incomplete fix for CVE-2017-17742 which addressed the CRLF vector but did not address an isolated CR or an isolated LF.

CVSS Vector

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

Reference

http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00041.html https://hackerone.com/reports/331984 https://lists.debian.org/debian-lts-announce/2019/11/msg00025.html https://lists.debian.org/debian-lts-announce/2019/12/msg00009.html https://lists.debian.org/debian-lts-announce/2020/08/msg00027.html https://seclists.org/bugtraq/2019/Dec/31 https://seclists.org/bugtraq/2019/Dec/32 https://security.gentoo.org/glsa/202003-06 https://www.debian.org/security/2019/dsa-4586 https://www.debian.org/security/2019/dsa-4587 https://www.oracle.com/security-alerts/cpujan2020.html https://www.ruby-lang.org/ja/news/2019/10/01/http-response-splitting-in-webrick-cve-2019-16254/ https://www.ruby-lang.org/ja/news/2019/10/01/ruby-2-4-8-released/ https://www.ruby-lang.org/ja/news/2019/10/01/ruby-2-5-7-released/ https://www.ruby-lang.org/ja/news/2019/10/01/ruby-2-6-5-released/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

LOW

Base Score

NONE

Base Severity

5.3