CVE-2020-24606

squid: Improper input validation could result in a DoS

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Squid before 4.13 and 5.x before 5.0.4 allows a trusted peer to perform Denial of Service by consuming all available CPU cycles during handling of a crafted Cache Digest response message. This only occurs when cache_peer is used with the cache digests feature. The problem exists because peerDigestHandleReply() livelocking in peer_digest.cc mishandles EOF.

Squid versiones anteriores a 4.13 y versiones 5.x anteriores a 5.0.4, permite que un peer de confianza lleve a cabo una Denegación de Servicio mediante el consumo de todos los ciclos de la CPU disponibles durante el manejo de un mensaje de respuesta de Cache Digest diseñado. Esto solo ocurre cuando cache_peer es usado con la funcionalidad cache digest. El problema se presenta porque el bloqueo en vivo de peerDigestHandleReply() en el archivo peer_digest.cc maneja inapropiadamente EOF.

A flaw was found in squid. A denial of service attack is possible due to an improper input validation. The highest threat from this vulnerability is to system availability.

*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

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-08-24 CVE Reserved
2020-08-24 CVE Published
2024-07-31 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation
CWE-667: Improper Locking

CAPEC

References (16)

URL	Tag	Source
https://github.com/squid-cache/squid/security/advisories/GHSA-vvj7-xjgq-g2jg	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/10/msg00005.html	Mailing List
https://security.netapp.com/advisory/ntap-20210219-0007	Third Party Advisory
https://security.netapp.com/advisory/ntap-20210226-0006	Third Party Advisory
https://security.netapp.com/advisory/ntap-20210226-0007	Broken Link

URL	Date	SRC

URL	Date	SRC
http://www.squid-cache.org/Versions/v4/changesets/SQUID-2020_9.patch	2023-11-07

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00012.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00017.html	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BE6FKUN7IGTIR2MEEMWYDT7N5EJJLZI2	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BMTFLVB7GLRF2CKGFPZ4G4R5DIIPHWI3	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HJJDI7JQFGQLVNCKMVY64LAFMKERAOK7	2023-11-07
https://usn.ubuntu.com/4477-1	2023-11-07
https://usn.ubuntu.com/4551-1	2023-11-07
https://www.debian.org/security/2020/dsa-4751	2023-11-07
https://access.redhat.com/security/cve/CVE-2020-24606	2020-11-04
https://bugzilla.redhat.com/show_bug.cgi?id=1871705	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 < 4.13 Search vendor "Squid-cache" for product "Squid" and version " >= 3.0 < 4.13"		-		Affected
Squid-cache Search vendor "Squid-cache"		Squid Search vendor "Squid-cache" for product "Squid"				>= 5.0.1 < 5.0.4 Search vendor "Squid-cache" for product "Squid" and version " >= 5.0.1 < 5.0.4"		-		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"				20.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "20.04"		lts		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
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				31 Search vendor "Fedoraproject" for product "Fedora" and version "31"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				32 Search vendor "Fedoraproject" for product "Fedora" and version "32"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				33 Search vendor "Fedoraproject" for product "Fedora" and version "33"		-		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
Opensuse Search vendor "Opensuse"		Leap Search vendor "Opensuse" for product "Leap"				15.2 Search vendor "Opensuse" for product "Leap" and version "15.2"		-		Affected