CVE-2019-11396

Severity Score

7.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An issue was discovered in Avira Free Security Suite 10. The permissive access rights on the SoftwareUpdater folder (files / folders and configuration) are incompatible with the privileged file manipulation performed by the product. Files can be created that can be used by an unprivileged user to obtain SYSTEM privileges. Arbitrary file creation can be achieved by abusing the SwuConfig.json file creation: an unprivileged user can replace these files by pseudo-symbolic links to arbitrary files. When an update occurs, a privileged service creates a file and sets its access rights, offering write access to the Everyone group in any directory.

Se detectó un problema en Avira Free Security Suite versión 10. Los derechos de acceso permisivo en la carpeta SoftwareUpdater (archivos / carpetas y configuración) son incompatibles con la manipulación de archivos privilegiada realizada por el producto. Pueden ser creados archivos que pueden ser usados por un usuario no privilegiado para obtener privilegios SYSTEM. La creación de archivos arbitrarios puede lograrse al abusar de la creación de archivos SwuConfig.json: un usuario no privilegiado puede reemplazar estos archivos por enlaces pseudo simbólicos en archivos arbitrarios. Cuando se produce una actualización, un servicio privilegiado crea un archivo y establece sus derechos de acceso, ofreciendo acceso de escritura al grupo Everyone en cualquier directorio.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-04-21 CVE Reserved
2019-08-04 CVE Published
2024-08-04 CVE Updated
2024-08-22 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-59: Improper Link Resolution Before File Access ('Link Following')

CAPEC

References (3)

URL	Tag	Source
http://packetstormsecurity.com/files/153868/Avira-Free-Security-Suite-2019-Software-Updater-2.0.6.13175-Improper-Access-Control.html	X_refsource_misc
https://medium.com/sidechannel-br/vulnerabilidade-no-avira-security-suite-pode-levar-%C3%A0-escala%C3%A7%C3%A3o-de-privil%C3%A9gios-no-windows-71964236c077	X_refsource_misc
https://seclists.org/fulldisclosure/2019/Aug/1	Mailing List

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Avira Search vendor "Avira"	Free Security Suite Search vendor "Avira" for product "Free Security Suite"	2019 Search vendor "Avira" for product "Free Security Suite" and version "2019"	-	Affected	in	Microsoft Search vendor "Microsoft"	Windows Search vendor "Microsoft" for product "Windows"	-	-	Safe
Avira Search vendor "Avira"	Software Updater Search vendor "Avira" for product "Software Updater"	<= 2.0.6.13175 Search vendor "Avira" for product "Software Updater" and version " <= 2.0.6.13175"	-	Affected	in	Microsoft Search vendor "Microsoft"	Windows Search vendor "Microsoft" for product "Windows"	-	-	Safe