7.8
HIGH
CVE-2019-17190
Avast Secure Browser ACL Privilege Escalation
Description

A Local Privilege Escalation issue was discovered in Avast Secure Browser 76.0.1659.101. The vulnerability is due to an insecure ACL set by the AvastBrowserUpdate.exe (which is running as NT AUTHORITY\SYSTEM) when AvastSecureBrowser.exe checks for new updates. When the update check is triggered, the elevated process cleans the ACL of the Update.ini file in %PROGRAMDATA%\Avast Software\Browser\Update\ and sets all privileges to group Everyone. Because any low-privileged user can create, delete, or modify the Update.ini file stored in this location, an attacker with low privileges can create a hard link named Update.ini in this folder, and make it point to a file writable by NT AUTHORITY\SYSTEM. Once AvastBrowserUpdate.exe is triggered by the update check functionality, the DACL is set to a misconfigured value on the crafted Update.ini and, consequently, to the target file that was previously not writable by the low-privileged attacker.

INFO

Published Date :

Jan. 27, 2020, 4:15 p.m.

Last Modified :

Jan. 31, 2023, 8:55 p.m.

Remotely Exploitable :

No

Impact Score :

5.9

Exploitability Score :

1.8
Affected Products

The following products are affected by CVE-2019-17190 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Avast secure_browser
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2019-17190.

URL Resource
http://packetstormsecurity.com/files/156844/Avast-Secure-Browser-76.0.1659.101-Local-Privilege-Escalation.html Third Party Advisory VDB Entry
http://seclists.org/fulldisclosure/2020/Mar/25 Mailing List Third Party Advisory
https://www.avast.com/bug-bounty-credits/en/a-tribute-to-our-security-research-community Vendor Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2019-17190 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2019-17190 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Modified Analysis by [email protected]

    Jan. 31, 2023

    Action Type Old Value New Value
    Changed Reference Type http://packetstormsecurity.com/files/156844/Avast-Secure-Browser-76.0.1659.101-Local-Privilege-Escalation.html No Types Assigned http://packetstormsecurity.com/files/156844/Avast-Secure-Browser-76.0.1659.101-Local-Privilege-Escalation.html Third Party Advisory, VDB Entry
    Changed Reference Type http://seclists.org/fulldisclosure/2020/Mar/25 No Types Assigned http://seclists.org/fulldisclosure/2020/Mar/25 Mailing List, Third Party Advisory
  • CWE Remap by [email protected]

    Aug. 24, 2020

    Action Type Old Value New Value
    Changed CWE CWE-269 CWE-863
  • CVE Modified by [email protected]

    Mar. 21, 2020

    Action Type Old Value New Value
    Added Reference http://packetstormsecurity.com/files/156844/Avast-Secure-Browser-76.0.1659.101-Local-Privilege-Escalation.html [No Types Assigned]
  • CVE Modified by [email protected]

    Mar. 20, 2020

    Action Type Old Value New Value
    Added Reference http://seclists.org/fulldisclosure/2020/Mar/25 [No Types Assigned]
  • Initial Analysis by [email protected]

    Jan. 30, 2020

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:L/AC:L/Au:N/C:C/I:C/A:C)
    Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type https://www.avast.com/bug-bounty-credits/en/a-tribute-to-our-security-research-community No Types Assigned https://www.avast.com/bug-bounty-credits/en/a-tribute-to-our-security-research-community Vendor Advisory
    Added CWE NIST CWE-269
    Added CPE Configuration OR *cpe:2.3:a:avast:secure_browser:76.0.1659.101:*:*:*:*:*:*:*
  • Initial Analysis by [email protected]

    Jan. 30, 2020

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:L/AC:L/Au:N/C:C/I:C/A:C)
    Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type https://www.avast.com/bug-bounty-credits/en/a-tribute-to-our-security-research-community No Types Assigned https://www.avast.com/bug-bounty-credits/en/a-tribute-to-our-security-research-community Vendor Advisory
    Added CWE NIST CWE-269
    Added CPE Configuration OR *cpe:2.3:a:avast:secure_browser:76.0.1659.101:*:*:*:*:*:*:*
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2019-17190 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2019-17190 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.04 }} 0.00%

score

0.05635

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability