CVE-2019-18679

squid: Information Disclosure issue in HTTP Digest Authentication

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 2.x, 3.x, and 4.x through 4.8. Due to incorrect data management, it is vulnerable to information disclosure when processing HTTP Digest Authentication. Nonce tokens contain the raw byte value of a pointer that sits within heap memory allocation. This information reduces ASLR protections and may aid attackers isolating memory areas to target for remote code execution attacks.

Se descubrió un problema en Squid versiones 2.x, 3.x y versiones 4.x hasta 4.8. Debido a una gestión de datos incorrecta, es vulnerable a una divulgación de información cuando se procesa HTTP Digest Authentication. Los tokens Nonce contienen el valor de byte sin procesar de un puntero que se encuentra dentro de la asignación de memoria heap. Esta información reduce las protecciones de ASLR y puede ayudar a atacantes a aislar áreas de memoria para apuntar ataques de ejecución de código remota.

Jeriko One and Kristoffer Danielsson discovered that Squid incorrectly handled certain URN requests. A remote attacker could possibly use this issue to bypass access checks and access restricted servers. This issue was only addressed in Ubuntu 19.04 and Ubuntu 19.10. Jeriko One discovered that Squid incorrectly handed URN responses. A remote attacker could use this issue to cause Squid to crash, resulting in a denial of service, or possibly execute arbitrary code. Various other issues were also addressed.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

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
2024-08-05 CVE Updated
2025-03-27 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

CAPEC

References (13)

URL	Tag	Source
http://www.squid-cache.org/Advisories/SQUID-2019_11.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=1156324	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/491	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-2019-18679	2020-11-04
https://bugzilla.redhat.com/show_bug.cgi?id=1770360	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"				>= 2.0 <= 2.7 Search vendor "Squid-cache" for product "Squid" and version " >= 2.0 <= 2.7"		-		Affected
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
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				2.7 Search vendor "Squid-cache" for product "Squid" and version "2.7"		stable2		Affected
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				2.7 Search vendor "Squid-cache" for product "Squid" and version "2.7"		stable3		Affected
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				2.7 Search vendor "Squid-cache" for product "Squid" and version "2.7"		stable4		Affected
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				2.7 Search vendor "Squid-cache" for product "Squid" and version "2.7"		stable5		Affected
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				2.7 Search vendor "Squid-cache" for product "Squid" and version "2.7"		stable6		Affected
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				2.7 Search vendor "Squid-cache" for product "Squid" and version "2.7"		stable7		Affected
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				2.7 Search vendor "Squid-cache" for product "Squid" and version "2.7"		stable8		Affected
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				2.7 Search vendor "Squid-cache" for product "Squid" and version "2.7"		stable9		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