Advisory Details

December 3rd, 2021

Avira Free Antivirus Unnecessary Privileges Local Privilege Escalation Vulnerability

CVE ID
CVSS SCORE	7.0, AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS	Avira
AFFECTED PRODUCTS	Free Antivirus
VULNERABILITY DETAILS	This vulnerability allows local attackers to escalate privileges on affected installations of Avira Free Antivirus. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the endpoint client. The issue results from allowing an untrusted process to impersonate the client of a pipe. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.
ADDITIONAL DETAILS	Fixed in version 15.0.2108.2113
DISCLOSURE TIMELINE	2021-07-19 - Vulnerability reported to vendor 2021-12-03 - Coordinated public release of advisory
CREDIT	Michael DePlante (@izobashi) of Trend Micro's Zero Day Initiative

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