Avast, Avira Products Vulnerable to DLL Hijacking

guest · Oct 23, 2019

Avast, Avira Products Vulnerable to DLL Hijacking
...could allow an attacker to load a malicious DLL file in an effort to bypass defenses and escalate privileges
October 22, 2019
https://www.securityweek.com/avast-avira-products-vulnerable-dll-hijacking

Tracked as CVE-2019-17093 and impacting all versions of Avast Antivirus and AVG Antivirus — AVG is a subsidiary of Avast and the applications share the core code — the first security flaw could be abused to achieve what SafeBreach describes as self-defense bypass, defense evasion, persistence and privilege escalation.

Exploitation of the bug requires administrative privileges, but could lead to loading a malicious DLL into multiple processes that run as NT AUTHORITY\SYSTEM.
The researchers discovered that AVGSvc.exe, an AM-PPL (Anti-Malware Protected Process Light), tries to load a DLL at start, but it searches for the file in the wrong folder.

The issue was found to impact all editions of Avast Antivirus and AVG Antivirus below version 19.8. A patch was released on September 26.
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The researchers found a similar issue in Avira Antivirus 2019 and explain that it too could lead to “defense evasion, persistence and privilege escalation by loading an arbitrary unsigned DLL into multiple signed processes that run as NT AUTHORITY\SYSTEM.”

This time, the researchers targeted the Avira ServiceHost service, which is the Avira Launcher service, and which is installed first. When started, the process attempts to load a missing library from its own directory.
The researchers reported the vulnerability to Avira on July 22, and the vendor informed them on September 18 that the issue was addressed. MITRE issued CVE-2019-17449 for the vulnerability on October 10.

“Avira believes the issue can’t be classified as CVE - therefore, this CVE has already been disputed at MITRE,” the security firm added.
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