CVE-2020-8621

Attempting QNAME minimization after forwarding can lead to an assertion failure in resolver.c

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

In BIND 9.14.0 -> 9.16.5, 9.17.0 -> 9.17.3, If a server is configured with both QNAME minimization and 'forward first' then an attacker who can send queries to it may be able to trigger the condition that will cause the server to crash. Servers that 'forward only' are not affected.

En BIND versiones 9.14.0 -) 9.16.5, 9.17.0 -) 9.17.3, si un servidor está configurado con minimización de QNAME y "forward first", entonces un atacante que pueda enviarle consultas puede ser capaz de desencadenar la condición que causará que el servidor se bloquee. Los servidores con "forward only" no están afectados.

*Credits: ISC would like to thank Joseph Gullo for bringing this vulnerability to our attention.

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

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-02-05 CVE Reserved
2020-08-21 CVE Published
2024-07-27 EPSS Updated
2024-09-16 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-617: Reachable Assertion

CAPEC

References (7)

URL	Tag	Source
https://security.netapp.com/advisory/ntap-20200827-0003	Third Party Advisory
https://www.synology.com/security/advisory/Synology_SA_20_19	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html	2022-04-28
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html	2022-04-28
https://kb.isc.org/docs/cve-2020-8621	2022-04-28
https://security.gentoo.org/glsa/202008-19	2022-04-28
https://usn.ubuntu.com/4468-1	2022-04-28

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Isc Search vendor "Isc"		Bind Search vendor "Isc" for product "Bind"				>= 9.14.0 <= 9.16.5 Search vendor "Isc" for product "Bind" and version " >= 9.14.0 <= 9.16.5"		-		Affected
Isc Search vendor "Isc"		Bind Search vendor "Isc" for product "Bind"				>= 9.17.0 <= 9.17.3 Search vendor "Isc" for product "Bind" and version " >= 9.17.0 <= 9.17.3"		-		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
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
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
Synology Search vendor "Synology"		Dns Server Search vendor "Synology" for product "Dns Server"				< 2.2.2-5027 Search vendor "Synology" for product "Dns Server" and version " < 2.2.2-5027"		-		Affected
Netapp Search vendor "Netapp"		Steelstore Cloud Integrated Storage Search vendor "Netapp" for product "Steelstore Cloud Integrated Storage"				-		-		Affected