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 :
Nov. 21, 2024, 4:31 a.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
5.9
Exploitability Score :
1.8
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 |
| 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 af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference http://packetstormsecurity.com/files/156844/Avast-Secure-Browser-76.0.1659.101-Local-Privilege-Escalation.html Added Reference http://seclists.org/fulldisclosure/2020/Mar/25 Added Reference https://www.avast.com/bug-bounty-credits/en/a-tribute-to-our-security-research-community -
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:*:*:*:*:*:*:*
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