CVE-2019-18678

squid: HTTP Request Splitting issue in HTTP message processing

Severity Score

5.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An issue was discovered in Squid 3.x and 4.x through 4.8. It allows attackers to smuggle HTTP requests through frontend software to a Squid instance that splits the HTTP Request pipeline differently. The resulting Response messages corrupt caches (between a client and Squid) with attacker-controlled content at arbitrary URLs. Effects are isolated to software between the attacker client and Squid. There are no effects on Squid itself, nor on any upstream servers. The issue is related to a request header containing whitespace between a header name and a colon.

Se descubrió un problema en Squid versiones 2.x, 3.x y versiones 4.x hasta 4.8. Permite a atacantes pasar un trafico no autorizado de peticiones HTTP mediante el software frontend e una instancia de Squid que divide la tubería de la petición HTTP de manera diferente. Los mensajes de respuesta resultantes corrompen las memorias caché (entre un cliente y Squid) con contenido controlado por el atacante en URL arbitrarias. Los efectos son aislados del software entre el cliente atacante y Squid. No existen efectos en Squid en sí, ni en ningún servidor ascendente. El problema está relacionado con un encabezado de petición que contiene espacios en blanco entre un nombre de encabezado y dos puntos.

*Credits: N/A

CVSS Scores

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

High

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

High

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

2019-11-04 CVE Reserved
2019-11-26 CVE Published
2024-03-21 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation
CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

CAPEC

References (13)

URL	Tag	Source
http://www.squid-cache.org/Advisories/SQUID-2019_10.txt	Third Party Advisory
http://www.squid-cache.org/Versions/v4/changesets/squid-4-671ba97abe929156dc4c717ee52ad22fba0f7443.patch	Release Notes
https://bugzilla.suse.com/show_bug.cgi?id=1156323	Issue Tracking
https://lists.debian.org/debian-lts-announce/2019/12/msg00011.html	Mailing List
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html	Mailing List

URL	Date	SRC

URL	Date	SRC
https://github.com/squid-cache/squid/pull/445	2023-11-07

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MTM74TU2BSLT5B3H4F3UDW53672NVLMC	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UEMOYTMCCFWK5NOXSXEIH5D2VGWVXR67	2023-11-07
https://security.gentoo.org/glsa/202003-34	2023-11-07
https://usn.ubuntu.com/4213-1	2023-11-07
https://www.debian.org/security/2020/dsa-4682	2023-11-07
https://access.redhat.com/security/cve/CVE-2019-18678	2020-11-04
https://bugzilla.redhat.com/show_bug.cgi?id=1770349	2020-11-04

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				>= 3.0 <= 3.5.28 Search vendor "Squid-cache" for product "Squid" and version " >= 3.0 <= 3.5.28"		-		Affected
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				>= 4.0 <= 4.8 Search vendor "Squid-cache" for product "Squid" and version " >= 4.0 <= 4.8"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				16.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "16.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				18.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "18.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				19.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "19.04"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				19.10 Search vendor "Canonical" for product "Ubuntu Linux" and version "19.10"		-		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
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				30 Search vendor "Fedoraproject" for product "Fedora" and version "30"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				31 Search vendor "Fedoraproject" for product "Fedora" and version "31"		-		Affected