NULL pointer dereference in ClamAV - CVE-2022-20796

Vulnerability identifier: #VU62801

CSH Severity: Medium

CVSS v4: 8.7 [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]

CVE-ID: CVE-2022-20796

CWE-ID: CWE-476

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to a NULL pointer dereference error in the scan verdict cache check. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.

ClamAV
Amazon Linux AMI
Gentoo Linux
SUSE Manager Server
SUSE Manager Proxy
Fedora
SUSE Linux Enterprise Server
Ubuntu
SUSE Linux Enterprise Server for SAP Applications
SUSE Linux Enterprise Desktop
SUSE Linux Enterprise Module for Basesystem
SUSE Linux Enterprise High Performance Computing
openSUSE Leap
clamav (Ubuntu package)
clamav
clamav-debuginfo
clamav-debugsource
libfreshclam2-debuginfo
libfreshclam2
libclamav9-debuginfo
libclamav9
clamav-devel
app-antivirus/clamav

Install updates from vendor's website.

ClamAV - addressed in versions 0.103.6, 0.104.3
clamav (Ubuntu package) - addressed in versions 0.103.6+dfsg0ubuntu0.16.04.1+esm1, 0.103.6+dfsg-0ubuntu0.18.04.1, 0.103.6+dfsg-0ubuntu0.20.04.1, 0.103.6+dfsg-0ubuntu0.21.10.1, 0.103.6+dfsg-0ubuntu0.22.04.1
clamav - addressed in versions 0.103.6-1.el7, 0.103.6-1.el8, 0.103.6-1.el9, 0.103.6-1.fc34, 0.103.6-1.fc35, 0.103.6-1.fc36
clamav - addressed in versions 0.103.6-1.49, 0.103.7-1
clamav-debuginfo - addressed in versions 0.103.6-3.18.1, 0.103.6-150000.3.38.1
clamav-debugsource - addressed in versions 0.103.6-3.18.1, 0.103.6-150000.3.38.1
clamav - addressed in versions 0.103.6-3.18.1, 0.103.6-150000.3.38.1
libfreshclam2-debuginfo - update to 0.103.6-150000.3.38.1
libfreshclam2 - update to 0.103.6-150000.3.38.1
libclamav9-debuginfo - update to 0.103.6-150000.3.38.1
libclamav9 - update to 0.103.6-150000.3.38.1
clamav-devel - update to 0.103.6-150000.3.38.1
app-antivirus/clamav - update to 0.103.7

• https://blog.clamav.net/2022/05/clamav-01050-01043-01036-released.html

• Multiple vulnerabilities in ClamAV
• Ubuntu update for clamav
• Ubuntu update for clamav
• Amazon Linux AMI update for clamav
• SUSE update for clamav
• SUSE update for clamav
• Gentoo update for ClamAV
• Amazon Linux AMI update for clamav
• Fedora 36 update for clamav
• Fedora 35 update for clamav
• Fedora 34 update for clamav
• Fedora EPEL 9 update for clamav
• Fedora EPEL 8 update for clamav
• Fedora EPEL 7 update for clamav