Vulnerability Monitor

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CVE-2021-45339

Privilege escalation vulnerability in Avast Antivirus prior to 20.4 allows a local user to gain elevated privileges by "hollowing" trusted process which could lead to the bypassing of Avast self-defense.

Published

2021-12-27T14:15:08.357

Last Modified

2024-11-21T06:32:06.720

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.8 (HIGH)

CVSSv2 Vector

AV:L/AC:L/Au:N/C:C/I:C/A:C

Access Vector: LOCAL
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: COMPLETE
Integrity Impact: COMPLETE
Availability Impact: COMPLETE

Exploitability Score

3.9

Impact Score

10.0

Weaknesses

Type: Primary
CWE-863

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	avast	antivirus	< 20.4	Yes

References

https://github.com/the-deniss/Vulnerability-Disclosures/tree/main/CVE-2021-AVST0 Exploit, Third Party Advisory ([email protected])
https://www.avast.com/hacker-hall-of-fame/en/researcher-david-eade-reports-antitrack-bug-to-avast-0 Vendor Advisory ([email protected])
https://github.com/the-deniss/Vulnerability-Disclosures/tree/main/CVE-2021-AVST0 Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.avast.com/hacker-hall-of-fame/en/researcher-david-eade-reports-antitrack-bug-to-avast-0 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)