A ClamAV security update has been released for Ubuntu Linux 18.04 LTS, 20.04 LTS, 21.10, and 22.04 LTS.

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Ubuntu Security Notice USN-5423-1
May 17, 2022

clamav vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.04 LTS
- Ubuntu 21.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in ClamAV.

Software Description:
- clamav: Anti-virus utility for Unix

Details:

Michał Dardas discovered that ClamAV incorrectly handled parsing CHM files.
A remote attacker could possibly use this issue to cause ClamAV to stop
responding, resulting in a denial of service. (CVE-2022-20770)

Michał Dardas discovered that ClamAV incorrectly handled parsing TIFF
files. A remote attacker could possibly use this issue to cause ClamAV to
stop responding, resulting in a denial of service. (CVE-2022-20771)

Michał Dardas discovered that ClamAV incorrectly handled parsing HTML
files. A remote attacker could possibly use this issue to cause ClamAV to
consume resources, resulting in a denial of service. (CVE-2022-20785)

Michał Dardas discovered that ClamAV incorrectly handled loading the
signature database. A remote attacker could possibly use this issue to
cause ClamAV to crash, resulting in a denial of service, or possibly
execute arbitrary code. (CVE-2022-20792)

Alexander Patrakov and Antoine Gatineau discovered that ClamAV incorrectly
handled the scan verdict cache check. A remote attacker could possibly use
this issue to cause ClamAV to crash, resulting in a denial of service, or
possibly execute arbitrary code.(CVE-2022-20796)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 22.04 LTS:
clamav 0.103.6+dfsg-0ubuntu0.22.04.1

Ubuntu 21.10:
clamav 0.103.6+dfsg-0ubuntu0.21.10.1

Ubuntu 20.04 LTS:
clamav 0.103.6+dfsg-0ubuntu0.20.04.1

Ubuntu 18.04 LTS:
clamav 0.103.6+dfsg-0ubuntu0.18.04.1

This update uses a new upstream release, which includes additional bug
fixes. In general, a standard system update will make all the necessary
changes.

References:
  https://ubuntu.com/security/notices/USN-5423-1
CVE-2022-20770, CVE-2022-20771, CVE-2022-20785, CVE-2022-20792,
CVE-2022-20796

Package Information:
  https://launchpad.net/ubuntu/+source/clamav/0.103.6+dfsg-0ubuntu0.22.04.1
  https://launchpad.net/ubuntu/+source/clamav/0.103.6+dfsg-0ubuntu0.21.10.1
  https://launchpad.net/ubuntu/+source/clamav/0.103.6+dfsg-0ubuntu0.20.04.1
  https://launchpad.net/ubuntu/+source/clamav/0.103.6+dfsg-0ubuntu0.18.04.1