#VU79633 Infinite loop in ClamAV - CVE-2023-20197

Vulnerability identifier: #VU79633

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-20197

CWE-ID: CWE-835

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
ClamAV
Client/Desktop applications / Antivirus software/Personal firewalls

Vendor: ClamAV

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to infinite loop in the HFS+ file parser. A remote attacker can consume all available system resources and cause denial of service conditions.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

ClamAV: 0.01, 0.02, 0.03, 0.3, 0.04, 0.05, 0.06, 0.9 rc1, 0.10, 0.11, 0.12, 0.13, 0.14, 0.15, 0.20, 0.21, 0.22, 0.23, 0.24, 0.51, 0.52, 0.53, 0.54, 0.60 - 0.60p, 0.65, 0.66, 0.67, 0.68 - 0.68.1, 0.70, 0.71, 0.72, 0.73, 0.74, 0.75 - 0.75.1, 0.80 rc1, 0.80 rc2, 0.80 rc3, 0.80 rc4, 0.80, 0.81 rc1, 0.81, 0.82, 0.83, 0.84 rc1, 0.84 rc2, 0.84, 0.85 - 0.85.1, 0.86 rc1 - 0.86.2, 0.87 - 0.87.1, 0.88 - 0.88.7, 0.90 rc1 - 0.90.3, 0.91 rc1 - 0.91.2, 0.92 - 0.92.1, 0.93 - 0.93.3, 0.94 - 0.94.2, 0.95 - 0.95.3, 0.96 - 0.96.5, 0.97 - 0.97.8, 0.98 - 0.98.7, 0.99 - 0.99.4, 0.100.0 - 0.100.3, 0.101.0 - 0.101.5, 0.102.0 - 0.102.4, 0.103 - 0.103.8, 0.104.0 - 0.104.4, 0.105.0 - 0.105.2, 1.0.0 - 1.0.1, 1.1.0

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External links
https://blog.clamav.net/2023/07/2023-08-16-releases.html
https://github.com/Cisco-Talos/clamav-devel/releases/tag/clamav-1.1.1
https://github.com/Cisco-Talos/clamav-devel/releases/tag/clamav-1.0.2
https://github.com/Cisco-Talos/clamav-devel/releases/tag/clamav-0.103.9

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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