PT-2021-7673 · Avast · Avast Antivirus

CVE-2021-45335 · Published 2021-12-27 · Updated 2023-02-11

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 20.4

Description The issue is related to the sandbox component in Avast Antivirus, which has an insecure permission by default. This could be exploited by a local user to manipulate the results of scans, allowing them to evade detection or delete arbitrary system files.

Recommendations For versions prior to 20.4, update to version 20.4 or later to resolve the issue. As a temporary workaround, consider restricting access to the sandbox component to minimize the risk of exploitation.

Exploit

Fix

Incorrect Default Permissions

Weakness Enumeration

CWE-276

Related Identifiers

BDU:2023-01190

CVE-2021-45335

Affected Products

Avast Antivirus

References · 9

• 🔥 https://github.com/the-deniss/Vulnerability-Disclosures/tree/main/CVE-2021-AVST3%20%26%20CVE-2021-AVST4%20%26%20CVE-2021-AVST5 · Exploit
• https://bdu.fstec.ru/vul/2023-01190 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-45335 · Security Note
• https://osv.dev/vulnerability/CVE-2021-45335 · Vendor Advisory
• https://avast.com/hacker-hall-of-fame/en/researcher-david-eade-reports-antitrack-bug-to-avast-0 · Vendor Advisory
• https://t.me/pentestingnews/33085 · Telegram Post
• https://t.me/cvenotify/25103 · Telegram Post
• https://t.me/cibsecurity/34671 · Telegram Post
• https://t.me/cybersecuritytechnologies/7732 · Telegram Post