CVE-2020-11653

varnish: remote clients may cause Varnish to assert and restart which could result in 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

An issue was discovered in Varnish Cache before 6.0.6 LTS, 6.1.x and 6.2.x before 6.2.3, and 6.3.x before 6.3.2. It occurs when communication with a TLS termination proxy uses PROXY version 2. There can be an assertion failure and daemon restart, which causes a performance loss.

Se detectó un problema en Varnish Cache versiones anteriores a 6.0.6 LTS, versiones 6.1.x y versiones 6.2.x anteriores a 6.2.3 y versiones 6.3.x anteriores a 6.3.2. Se presenta cuando la comunicación con un proxy de terminación TLS usa PROXY versión 2. Se puede presentar un fallo de aserción y un reinicio del demonio, lo que causa una pérdida de rendimiento.

*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

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

CWE

CWE-400: Uncontrolled Resource Consumption
CWE-617: Reachable Assertion

CAPEC

References (6)

URL	Tag	Source
https://lists.debian.org/debian-lts-announce/2022/11/msg00036.html	Mailing List

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00026.html	2022-11-29
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00031.html	2022-11-29
https://varnish-cache.org/security/VSV00005.html#vsv00005	2022-11-29
https://access.redhat.com/security/cve/CVE-2020-11653	2020-11-04
https://bugzilla.redhat.com/show_bug.cgi?id=1813867	2020-11-04

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Varnish-cache Search vendor "Varnish-cache"		Varnish Cache Search vendor "Varnish-cache" for product "Varnish Cache"				>= 6.1.0 < 6.2.3 Search vendor "Varnish-cache" for product "Varnish Cache" and version " >= 6.1.0 < 6.2.3"		-		Affected
Varnish-cache Search vendor "Varnish-cache"		Varnish Cache Search vendor "Varnish-cache" for product "Varnish Cache"				>= 6.3.0 < 6.3.2 Search vendor "Varnish-cache" for product "Varnish Cache" and version " >= 6.3.0 < 6.3.2"		-		Affected
Varnish-software Search vendor "Varnish-software"		Varnish Cache Search vendor "Varnish-software" for product "Varnish Cache"				>= 6.0.0 < 6.0.6 Search vendor "Varnish-software" for product "Varnish Cache" and version " >= 6.0.0 < 6.0.6"		lts		Affected
Opensuse Search vendor "Opensuse"		Backports Sle Search vendor "Opensuse" for product "Backports Sle"				15.0 Search vendor "Opensuse" for product "Backports Sle" and version "15.0"		sp1		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
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