CVE-2019-3870

Severity Score

6.1

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A vulnerability was found in Samba from version (including) 4.9 to versions before 4.9.6 and 4.10.2. During the creation of a new Samba AD DC, files are created in a private subdirectory of the install location. This directory is typically mode 0700, that is owner (root) only access. However in some upgraded installations it will have other permissions, such as 0755, because this was the default before Samba 4.8. Within this directory, files are created with mode 0666, which is world-writable, including a sample krb5.conf, and the list of DNS names and servicePrincipalName values to update.

Se encontró una vulnerabilidad en Samba desde la versión 4.9 (incluida) hasta las versiones anteriores a la 4.9.6 y 4.10.2. Durante la creación de un nuevo Samba AD DC, los archivos se crean en un subdirectorio privado de la ubicación de instalación. Este directorio es típicamente el modo 0700, es decir, acceso sólo para administradores (root). Sin embargo, en algunas instalaciones actualizadas tendrá otros permisos, como el 0755, ya que éste era el predeterminado en versiones de Samba anteriores a la 4.8. Dentro de este directorio, los archivos se crean con el modo 0666, en el que cualquiera puede escribir, incluyendo un ejemplo de krb5.conf, y la lista de nombres DNS y valores de servicePrincipalName para actualizar.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-01-03 CVE Reserved
2019-04-09 CVE Published
2024-04-02 EPSS Updated
2024-08-04 CVE Updated
2024-08-04 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-276: Incorrect Default Permissions

CAPEC

References (7)

URL	Tag	Source
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3870	Issue Tracking
https://support.f5.com/csp/article/K20804356	Third Party Advisory
https://www.synology.com/security/advisory/Synology_SA_19_15	Third Party Advisory

URL	Date	SRC
https://bugzilla.samba.org/show_bug.cgi?id=13834	2024-08-04

URL	Date	SRC
https://www.samba.org/samba/security/CVE-2019-3870.html	2023-11-07

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6354GALK73CZWQKFUG7AWB6EIEGFMF62	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JTJVFA3RZ6G2IZDTVKLHRMX6QBYA4GPA	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Synology Search vendor "Synology"	Skynas Firmware Search vendor "Synology" for product "Skynas Firmware"	-	-	Affected	in	Synology Search vendor "Synology"	Skynas Search vendor "Synology" for product "Skynas"	-	-	Safe
Synology Search vendor "Synology"	Vs960hd Firmware Search vendor "Synology" for product "Vs960hd Firmware"	< 2.3.6-1720 Search vendor "Synology" for product "Vs960hd Firmware" and version " < 2.3.6-1720"	-	Affected	in	Synology Search vendor "Synology"	Vs960hd Search vendor "Synology" for product "Vs960hd"	-	-	Safe
Samba Search vendor "Samba"		Samba Search vendor "Samba" for product "Samba"				>= 4.9.0 < 4.9.6 Search vendor "Samba" for product "Samba" and version " >= 4.9.0 < 4.9.6"		-		Affected
Samba Search vendor "Samba"		Samba Search vendor "Samba" for product "Samba"				>= 4.10.0 < 4.10.2 Search vendor "Samba" for product "Samba" and version " >= 4.10.0 < 4.10.2"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				29 Search vendor "Fedoraproject" for product "Fedora" and version "29"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				30 Search vendor "Fedoraproject" for product "Fedora" and version "30"		-		Affected
Synology Search vendor "Synology"		Directory Server Search vendor "Synology" for product "Directory Server"				-		-		Affected
Synology Search vendor "Synology"		Diskstation Manager Search vendor "Synology" for product "Diskstation Manager"				5.2 Search vendor "Synology" for product "Diskstation Manager" and version "5.2"		-		Affected
Synology Search vendor "Synology"		Diskstation Manager Search vendor "Synology" for product "Diskstation Manager"				6.1 Search vendor "Synology" for product "Diskstation Manager" and version "6.1"		-		Affected
Synology Search vendor "Synology"		Diskstation Manager Search vendor "Synology" for product "Diskstation Manager"				6.2 Search vendor "Synology" for product "Diskstation Manager" and version "6.2"		-		Affected
Synology Search vendor "Synology"		Router Manager Search vendor "Synology" for product "Router Manager"				1.2 Search vendor "Synology" for product "Router Manager" and version "1.2"		-		Affected