CVE-2019-18676

squid: Buffer overflow in URI processor

Severity Score

7.5

*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. Due to incorrect input validation, there is a heap-based buffer overflow that can result in Denial of Service to all clients using the proxy. Severity is high due to this vulnerability occurring before normal security checks; any remote client that can reach the proxy port can trivially perform the attack via a crafted URI scheme.

Se descubrió un problema en Squid versiones 2.x, 3.x y versiones 4.x hasta 4.8. Debido a una comprobación de entrada incorrecta, hay un desbordamiento del búfer en la región heap de la memoria que puede resultar en una Denegación de Servicio a todos los clientes que usan el proxy. La gravedad es alta debido a que esta vulnerabilidad ocurre antes de las comprobaciones de seguridad normales; cualquier cliente remoto que pueda alcanzar el puerto proxy puede realizar trivialmente el ataque por medio de un esquema de URI especialmente diseñado.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* 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-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-787: Out-of-bounds Write

CAPEC

References (12)

URL	Tag	Source
http://www.squid-cache.org/Advisories/SQUID-2019_8.txt	Third Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1156329	Issue Tracking
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html	Mailing List

URL	Date	SRC

URL	Date	SRC
http://www.squid-cache.org/Versions/v4/changesets/squid-4-fbbdf75efd7a5cc244b4886a9d42ea458c5a3a73.patch	2023-11-07
https://github.com/squid-cache/squid/pull/275	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://usn.ubuntu.com/4213-1	2023-11-07
https://usn.ubuntu.com/4446-1	2023-11-07
https://www.debian.org/security/2020/dsa-4682	2023-11-07
https://access.redhat.com/security/cve/CVE-2019-18676	2020-11-04
https://bugzilla.redhat.com/show_bug.cgi?id=1770375	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
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
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		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"		esm		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