SB2024080849 - Multiple vulnerabilities in Avast Antivirus

Description

This security bulletin contains information about 4 secuirty vulnerabilities.

1) Link following (CVE-ID: CVE-2024-7227)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists dye to incorrect handling of symbolic links within the Avast Service (AvastSvc). A local user can create a symbolic link to a critical file on the system and delete it, which can result in privilege escalation.

2) Link following (CVE-ID: CVE-2024-7232)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists dye to incorrect handling of symbolic links within the Avast Service (AvastSvc). A local user can create a symbolic link to a critical folder on the system and delete it, which can result in privilege escalation.

3) Link following (CVE-ID: CVE-2024-7233)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists dye to incorrect handling of symbolic links within the Avast Service (AvastSvc). A local user can create a symbolic link to a critical folder on the system and delete it, which can result in privilege escalation.

4) Link following (CVE-ID: CVE-2024-7228)

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists dye to incorrect handling of symbolic links within the Avast Service. A local user can abuse the service to create a folder, which can lead to a denial of service.

Remediation

Install update from vendor's website.

References

• https://www.zerodayinitiative.com/advisories/ZDI-24-1003/
• https://www.zerodayinitiative.com/advisories/ZDI-24-1004/
• https://www.zerodayinitiative.com/advisories/ZDI-24-1005/
• https://www.zerodayinitiative.com/advisories/ZDI-24-999/