PT-2021-24230 · Avast · Avast Antivirus

Published 2021-12-27 · Updated 2023-02-11 · CVE-2021-45337

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions: Avast Antivirus versions prior to 20.8

Description: A privilege escalation issue exists in the Self-Defense driver of Avast Antivirus, allowing a local user with SYSTEM privileges to gain elevated privileges. This is achieved by "hollowing" the process wsc proxy.exe, potentially leading to the acquisition of antimalware protection.

Recommendations: For Avast Antivirus versions prior to 20.8, update to version 20.8 or later to resolve the issue. As a temporary workaround, consider restricting access to the wsc proxy.exe process to minimize the risk of exploitation.

Exploit

Fix

Related Identifiers

CVE-2021-45337

Affected Products

Avast Antivirus

References · 7

• 🔥 https://github.com/the-deniss/Vulnerability-Disclosures/tree/main/CVE-2021-AVST3%20%26%20CVE-2021-AVST4%20%26%20CVE-2021-AVST5 · Exploit
• https://osv.dev/vulnerability/CVE-2021-45337 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-45337 · Security Note
• https://avast.com/hacker-hall-of-fame/en/researcher-david-eade-reports-antitrack-bug-to-avast-0 · Vendor Advisory
• https://t.me/cybersecuritytechnologies/7732 · Telegram Post
• https://t.me/cibsecurity/34670 · Telegram Post
• https://t.me/pentestingnews/33085 · Telegram Post