CVE-2019-16254

ruby: HTTP response splitting in WEBrick

Severity Score

5.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Ruby versiones hasta 2.4.7, versiones 2.5.x hasta 2.5.6 y versiones 2.6.x hasta 2.6.4, permite HTTP Response Splitting. Si un programa que utiliza WEBrick inserta información no segura en el encabezado de respuesta, un atacante puede explotarlo para insertar un carácter newline para dividir un encabezado e inyectar contenido malicioso para engañar a los clientes. NOTA: este problema se presenta debido a una solución incompleta de CVE-2017-17742, que abordó el vector CRLF, pero no abordó un CR aislado o un LF aislado.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-09-11 CVE Reserved
2019-11-26 CVE Published
2024-08-05 CVE Updated
2024-11-19 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')

CAPEC

References (18)

URL	Tag	Source
https://hackerone.com/reports/331984	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/11/msg00025.html	Mailing List
https://lists.debian.org/debian-lts-announce/2019/12/msg00009.html	Mailing List
https://lists.debian.org/debian-lts-announce/2020/08/msg00027.html	Mailing List
https://lists.debian.org/debian-lts-announce/2023/04/msg00033.html	Mailing List
https://seclists.org/bugtraq/2019/Dec/31	Mailing List
https://seclists.org/bugtraq/2019/Dec/32	Mailing List
https://www.oracle.com/security-alerts/cpujan2020.html

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00041.html	2023-04-30
https://security.gentoo.org/glsa/202003-06	2023-04-30
https://www.debian.org/security/2019/dsa-4586	2023-04-30
https://www.debian.org/security/2019/dsa-4587	2023-04-30
https://www.ruby-lang.org/ja/news/2019/10/01/http-response-splitting-in-webrick-cve-2019-16254	2023-04-30
https://www.ruby-lang.org/ja/news/2019/10/01/ruby-2-4-8-released	2023-04-30
https://www.ruby-lang.org/ja/news/2019/10/01/ruby-2-5-7-released	2023-04-30
https://www.ruby-lang.org/ja/news/2019/10/01/ruby-2-6-5-released	2023-04-30
https://access.redhat.com/security/cve/CVE-2019-16254	2022-02-21
https://bugzilla.redhat.com/show_bug.cgi?id=1789556	2022-02-21

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Ruby-lang Search vendor "Ruby-lang"		Ruby Search vendor "Ruby-lang" for product "Ruby"				<= 2.3.0 Search vendor "Ruby-lang" for product "Ruby" and version " <= 2.3.0"		-		Affected
Ruby-lang Search vendor "Ruby-lang"		Ruby Search vendor "Ruby-lang" for product "Ruby"				>= 2.4.0 <= 2.4.7 Search vendor "Ruby-lang" for product "Ruby" and version " >= 2.4.0 <= 2.4.7"		-		Affected
Ruby-lang Search vendor "Ruby-lang"		Ruby Search vendor "Ruby-lang" for product "Ruby"				>= 2.5.0 <= 2.5.6 Search vendor "Ruby-lang" for product "Ruby" and version " >= 2.5.0 <= 2.5.6"		-		Affected
Ruby-lang Search vendor "Ruby-lang"		Ruby Search vendor "Ruby-lang" for product "Ruby"				>= 2.6.0 <= 2.6.4 Search vendor "Ruby-lang" for product "Ruby" and version " >= 2.6.0 <= 2.6.4"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				8.0 Search vendor "Debian" for product "Debian Linux" and version "8.0"		-		Affected