CVE-2019-18894

Severity Score

7.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

In Avast Premium Security 19.8.2393, attackers can send a specially crafted request to the local web server run by Avast Antivirus on port 27275 to support Bank Mode functionality. A flaw in the processing of a command allows execution of arbitrary OS commands with the privileges of the currently logged in user. This allows for example attackers who compromised a browser extension to escape from the browser sandbox.

En Avast Premium Security versión 19.8.2393, los atacantes pueden enviar una petición especialmente diseñada hacia el servidor web local ejecutado por Avast Antivirus en el puerto 27275 para admitir la funcionalidad Bank Mode. Un fallo en el procesamiento de un comando permite una ejecución de comandos de Sistema Operativo arbitrarios con los privilegios del usuario actualmente conectado. Esto permite, por ejemplo, que los atacantes que comprometieron una extensión del navegador para escapar del sandbox del navegador.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-11-12 CVE Reserved
2020-01-13 CVE Published
2023-05-18 EPSS Updated
2024-08-05 CVE Updated
2024-08-05 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC
https://palant.de/2020/01/13/pwning-avast-secure-browser-for-fun-and-profit	2024-08-05

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
Avast Search vendor "Avast"		Premium Security Search vendor "Avast" for product "Premium Security"				19.8.2393 Search vendor "Avast" for product "Premium Security" and version "19.8.2393"		-		Affected