CVE-2020-8517

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 before 4.10. Due to incorrect input validation, the NTLM authentication credentials parser in ext_lm_group_acl may write to memory outside the credentials buffer. On systems with memory access protections, this can result in the helper process being terminated unexpectedly. This leads to the Squid process also terminating and a denial of service for all clients using the proxy.

Se detectó un problema en Squid versiones anteriores a 4.10. Debido a una comprobación de entrada incorrecta, el analizador de credenciales de autenticación NTLM en la función ext_lm_group_acl puede escribir en la memoria fuera del búfer de credenciales. En sistemas con protecciones de acceso a la memoria, esto puede resultar en que el proceso auxiliar termine inesperadamente. Esto conlleva a que el proceso de Squid también termine y a una denegación de servicio para todos los clientes que están usando el proxy.

*Credits: N/A

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

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

2020-02-02 CVE Reserved
2020-02-04 CVE Published
2024-01-11 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation
CWE-787: Out-of-bounds Write

CAPEC

References (8)

URL	Tag	Source
https://security.netapp.com/advisory/ntap-20210304-0002	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
http://www.squid-cache.org/Versions/v4/changesets/squid-4-6982f1187a26557e582172965e266f544ea562a5.patch	2021-07-21

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00012.html	2021-07-21
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00010.html	2021-07-21
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html	2021-07-21
http://www.squid-cache.org/Advisories/SQUID-2020_3.txt	2021-07-21
https://security.gentoo.org/glsa/202003-34	2021-07-21
https://usn.ubuntu.com/4289-1	2021-07-21

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"				< 4.10 Search vendor "Squid-cache" for product "Squid" and version " < 4.10"		-		Affected
Opensuse Search vendor "Opensuse"		Leap Search vendor "Opensuse" for product "Leap"				15.1 Search vendor "Opensuse" for product "Leap" and version "15.1"		-		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"				19.10 Search vendor "Canonical" for product "Ubuntu Linux" and version "19.10"		-		Affected