Avira Free Antivirus Unnecessary Privileges Local Privilege Escalation Vulnerability

December 3rd, 2021
ZDI-21-1378 ZDI-CAN-14124

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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