CVE-2020-15136

Improper authentication in etcd

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

In ectd before versions 3.4.10 and 3.3.23, gateway TLS authentication is only applied to endpoints detected in DNS SRV records. When starting a gateway, TLS authentication will only be attempted on endpoints identified in DNS SRV records for a given domain, which occurs in the discoverEndpoints function. No authentication is performed against endpoints provided in the --endpoints flag. This has been fixed in versions 3.4.10 and 3.3.23 with improved documentation and deprecation of the functionality.

En ectd anterior a las versiones 3.4.10 y 3.3.23, la autenticación TLS de la puerta de enlace solo se aplica a los endpoints detectados en los registros SRV de DNS. Cuando se inicia una puerta de enlace, la autenticación TLS solo se intentará en los endpoints identificados en los registros SRV de DNS para un dominio determinado, lo que ocurre en la función discoverEndpoints. No se lleva a cabo la autenticación contra los endpoints proporcionados en el flag --endpoints. Esto se ha corregido en las versiones 3.4.10 y 3.3.23 con documentación mejorada y degradación de la funcionalidad

A flaw was found in etcd. The gateway TLS authentication is only applied to endpoints detected in DNS SRV records. When starting a gateway, TLS authentication will only be attempted on endpoints identified in DNS SRV records for a given domain, which occurs in the discoverEndpoints function. No authentication is performed against endpoints provided in the --endpoints flag.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-06-25 CVE Reserved
2020-08-06 CVE Published
2024-06-10 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-287: Improper Authentication
CWE-306: Missing Authentication for Critical Function

CAPEC

References (5)

URL	Tag	Source
https://github.com/etcd-io/etcd/blob/master/Documentation/op-guide/gateway.md	Broken Link
https://github.com/etcd-io/etcd/security/advisories/GHSA-wr2v-9rpq-c35q	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L6B6R43Y7M3DCHWK3L3UVGE2K6WWECMP	2023-11-07
https://access.redhat.com/security/cve/CVE-2020-15136	2021-07-27
https://bugzilla.redhat.com/show_bug.cgi?id=1868880	2021-07-27

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Redhat Search vendor "Redhat"		Etcd Search vendor "Redhat" for product "Etcd"				>= 3.3.0 < 3.3.23 Search vendor "Redhat" for product "Etcd" and version " >= 3.3.0 < 3.3.23"		-		Affected
Redhat Search vendor "Redhat"		Etcd Search vendor "Redhat" for product "Etcd"				>= 3.4.0 < 3.4.10 Search vendor "Redhat" for product "Etcd" and version " >= 3.4.0 < 3.4.10"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				32 Search vendor "Fedoraproject" for product "Fedora" and version "32"		-		Affected