CVE-2020-28327

Severity Score

5.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A res_pjsip_session crash was discovered in Asterisk Open Source 13.x before 13.37.1, 16.x before 16.14.1, 17.x before 17.8.1, and 18.x before 18.0.1. and Certified Asterisk before 16.8-cert5. Upon receiving a new SIP Invite, Asterisk did not return the created dialog locked or referenced. This caused a gap between the creation of the dialog object, and its next use by the thread that created it. Depending on some off-nominal circumstances and timing, it was possible for another thread to free said dialog in this gap. Asterisk could then crash when the dialog object, or any of its dependent objects, were dereferenced or accessed next by the initial-creation thread. Note, however, that this crash can only occur when using a connection-oriented protocol (e.g., TCP or TLS, but not UDP) for SIP transport. Also, the remote client must be authenticated, or Asterisk must be configured for anonymous calling.

Se detectó un bloqueo de res_pjsip_session en Asterisk Open Source versiones 13.x anteriores a 13.37.1, versiones 16.x anteriores a 16.14.1, versiones 17.x anteriores a 17.8.1 y versiones 18.x anteriores a 18.0.1. y Certified Asterisk anteriores a 16.8-cert5. Tras recibir una nueva invitación SIP, Asterisk no devolvió el cuadro de diálogo diseñado bloqueado o referenciado. Esto provocó una brecha entre la creación del objeto de diálogo y su próximo uso por parte del subproceso que lo creó. Dependiendo de algunas circunstancias y tiempos fuera de lo nominal, fue posible que otro subproceso liberara dicho cuadro de diálogo en este espacio. Asterisk podría bloquearse cuando el objeto de diálogo, o cualquiera de sus objetos dependientes, fueran desreferenciados o accedidos a continuación por el subproceso de creación inicial. Sin embargo, tome en cuenta que este bloqueo solo puede ocurrir cuando se usa un protocolo orientado a la conexión (por ejemplo, TCP o TLS, pero no UDP) para el transporte SIP. Además, el cliente remoto debe estar autenticado, o Asterisk debe estar configurado para llamadas anónimas

*Credits: N/A

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

High

Authentication

Single

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-11-06 CVE Reserved
2020-11-06 CVE Published
2024-08-04 CVE Updated
2024-08-04 First Exploit
2024-08-16 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-404: Improper Resource Shutdown or Release

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC
https://issues.asterisk.org/jira/browse/ASTERISK-29057	2024-08-04

URL	Date	SRC
http://downloads.asterisk.org/pub/security/AST-2020-001.html	2020-11-20

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Asterisk Search vendor "Asterisk"		Open Source Search vendor "Asterisk" for product "Open Source"				>= 13.0.0 < 13.37.1 Search vendor "Asterisk" for product "Open Source" and version " >= 13.0.0 < 13.37.1"		-		Affected
Asterisk Search vendor "Asterisk"		Open Source Search vendor "Asterisk" for product "Open Source"				>= 16.0.0 < 16.14.1 Search vendor "Asterisk" for product "Open Source" and version " >= 16.0.0 < 16.14.1"		-		Affected
Asterisk Search vendor "Asterisk"		Open Source Search vendor "Asterisk" for product "Open Source"				>= 17.0.0 < 17.8.1 Search vendor "Asterisk" for product "Open Source" and version " >= 17.0.0 < 17.8.1"		-		Affected
Asterisk Search vendor "Asterisk"		Open Source Search vendor "Asterisk" for product "Open Source"				>= 18.0.0 < 18.0.1 Search vendor "Asterisk" for product "Open Source" and version " >= 18.0.0 < 18.0.1"		-		Affected
Digium Search vendor "Digium"		Certified Asterisk Search vendor "Digium" for product "Certified Asterisk"				16.8 Search vendor "Digium" for product "Certified Asterisk" and version "16.8"		-		Affected
Digium Search vendor "Digium"		Certified Asterisk Search vendor "Digium" for product "Certified Asterisk"				16.8 Search vendor "Digium" for product "Certified Asterisk" and version "16.8"		cert1-rc1		Affected
Digium Search vendor "Digium"		Certified Asterisk Search vendor "Digium" for product "Certified Asterisk"				16.8 Search vendor "Digium" for product "Certified Asterisk" and version "16.8"		cert1-rc2		Affected
Digium Search vendor "Digium"		Certified Asterisk Search vendor "Digium" for product "Certified Asterisk"				16.8 Search vendor "Digium" for product "Certified Asterisk" and version "16.8"		cert1-rc3		Affected
Digium Search vendor "Digium"		Certified Asterisk Search vendor "Digium" for product "Certified Asterisk"				16.8 Search vendor "Digium" for product "Certified Asterisk" and version "16.8"		cert1-rc4		Affected
Digium Search vendor "Digium"		Certified Asterisk Search vendor "Digium" for product "Certified Asterisk"				16.8 Search vendor "Digium" for product "Certified Asterisk" and version "16.8"		cert2		Affected
Digium Search vendor "Digium"		Certified Asterisk Search vendor "Digium" for product "Certified Asterisk"				16.8 Search vendor "Digium" for product "Certified Asterisk" and version "16.8"		cert3		Affected
Digium Search vendor "Digium"		Certified Asterisk Search vendor "Digium" for product "Certified Asterisk"				16.8 Search vendor "Digium" for product "Certified Asterisk" and version "16.8"		cert4		Affected
Digium Search vendor "Digium"		Certified Asterisk Search vendor "Digium" for product "Certified Asterisk"				16.8 Search vendor "Digium" for product "Certified Asterisk" and version "16.8"		cert4-rc1		Affected
Digium Search vendor "Digium"		Certified Asterisk Search vendor "Digium" for product "Certified Asterisk"				16.8 Search vendor "Digium" for product "Certified Asterisk" and version "16.8"		cert4-rc2		Affected
Digium Search vendor "Digium"		Certified Asterisk Search vendor "Digium" for product "Certified Asterisk"				16.8 Search vendor "Digium" for product "Certified Asterisk" and version "16.8"		cert4-rc3		Affected
Digium Search vendor "Digium"		Certified Asterisk Search vendor "Digium" for product "Certified Asterisk"				16.8 Search vendor "Digium" for product "Certified Asterisk" and version "16.8"		cert4-rc4		Affected