Multiple vulnerabilities in Avast Antivirus

1) Link following

EUVDB-ID: #VU95569

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2024-7227

CWE-ID: CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Exploit availability: No

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Avast Antivirus: 1 - 2016.11.1.2262

CPE2.3

External links

http://www.zerodayinitiative.com/advisories/ZDI-24-1003/

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Link following

EUVDB-ID: #VU95568

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2024-7232

CWE-ID: CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Exploit availability: No

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Avast Antivirus: 1 - 2016.11.1.2262

CPE2.3

External links

http://www.zerodayinitiative.com/advisories/ZDI-24-1004/

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Link following

EUVDB-ID: #VU95567

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2024-7233

CWE-ID: CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Exploit availability: No

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Avast Antivirus: 1 - 2016.11.1.2262

CPE2.3

External links

http://www.zerodayinitiative.com/advisories/ZDI-24-1005/

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

4) Link following

EUVDB-ID: #VU95566

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2024-7228

CWE-ID: CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Exploit availability: No

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Avast Antivirus: 1 - 2016.11.1.2262

CPE2.3

External links

http://www.zerodayinitiative.com/advisories/ZDI-24-999/

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

Risk	Low
Patch available	YES
Number of vulnerabilities	4
CVE-ID	CVE-2024-7227 CVE-2024-7232 CVE-2024-7233 CVE-2024-7228
CWE-ID	CWE-59
Exploitation vector	Local
Public exploit	N/A
Vulnerable software	Avast Antivirus Client/Desktop applications / Antivirus software/Personal firewalls
Vendor	Avast Software s.r.o.