PT-2021-24232 · Avast · Avast Antivirus

Published 2021-12-27 · Updated 2022-07-12 · CVE-2021-45339

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions: Avast Antivirus versions prior to 20.4

Description: A privilege escalation issue allows a local user to gain elevated privileges by "hollowing" a trusted process, potentially leading to the bypassing of Avast self-defense.

Recommendations: For Avast Antivirus versions prior to 20.4, update to version 20.4 or later to resolve the issue. As a temporary workaround, consider restricting access to trusted processes to minimize the risk of exploitation.

Exploit

Fix

Incorrect Authorization

Weakness Enumeration

CWE-863

Related Identifiers

CVE-2021-45339

Affected Products

Avast Antivirus

References · 6

• 🔥 https://github.com/the-deniss/Vulnerability-Disclosures/tree/main/CVE-2021-AVST0 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-45339 · Security Note
• https://avast.com/hacker-hall-of-fame/en/researcher-david-eade-reports-antitrack-bug-to-avast-0 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-45339 · Vendor Advisory
• https://t.me/cvenotify/25203 · Telegram Post
• https://t.me/cibsecurity/34672 · Telegram Post