Avast Antivirus (All Editions) < 19.8 DLL Preloading Vulnerability (Windows)

Technical Details

Severity Level:

Low Severity

CVSS Score:


CVSS Base Vector:

Detection Type:
Windows Registry

Solution Type:
Vendor Patch

This host is running Avast Antivirus and is prone to a dll preloading vulnerability.

Detection Method:
Checks if a vulnerable version is present on the target host.

Technical Details:
The vulnerability gives attackers the ability to: - load and execute malicious payloads using multiple signed services, within the context of Avast signed processes - bypass the part of the self-defense mechanism that should prevent an attacker from tampering with processes and files of Avast Antivirus and load an arbitrary DLL into the Antivirus process - load and execute malicious payloads in a persistent way, each time the services are loaded.

The vulnerability can be used to achieve self-defense bypass, defense evasion, persistence and privilege escalation.

Affected Versions:
All Editions of Avast Antivirus before version 19.8.

Update to Avast Antivirus version 19.8 or later.



Creation Time:

2019-10-26 16:39:30

Modification Time:

2019-10-29 06:41:59

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