A ClamAV regression update has been released for Ubuntu Linux 21.04, 20.10, 20.04 LTS, 18.04 LTS, 16.04 ESM, and 14.04 ESM.

USN-4918-3: ClamAV regression

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Ubuntu Security Notice USN-4918-3
May 03, 2021

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

- Ubuntu 21.04
- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

USN-4918-1 introduced a regression in ClamAV that could cause it to fail to scan.

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

Details:

USN-4918-1 fixed vulnerabilities in ClamAV. The updated package could
fail to properly scan in some situations. This update fixes
the problem.

Original advisory details:

It was discovered that ClamAV incorrectly handled parsing Excel documents.
A remote attacker could possibly use this issue to cause ClamAV to hang,
resulting in a denial of service. (CVE-2021-1252)

It was discovered that ClamAV incorrectly handled parsing PDF documents. A
remote attacker could possibly use this issue to cause ClamAV to crash,
resulting in a denial of service. (CVE-2021-1404)

It was discovered that ClamAV incorrectly handled parsing email. A remote
attacker could possibly use this issue to cause ClamAV to crash, resulting
in a denial of service. (CVE-2021-1405)

Update instructions:

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

Ubuntu 21.04:
clamav 0.103.2+dfsg-1ubuntu0.21.04.1
libclamav9 0.103.2+dfsg-1ubuntu0.21.04.1

Ubuntu 20.10:
clamav 0.103.2+dfsg-0ubuntu0.20.10.2
libclamav9 0.103.2+dfsg-0ubuntu0.20.10.2

Ubuntu 20.04 LTS:
clamav 0.103.2+dfsg-0ubuntu0.20.04.2
libclamav9 0.103.2+dfsg-0ubuntu0.20.04.2

Ubuntu 18.04 LTS:
clamav 0.103.2+dfsg-0ubuntu0.18.04.2
libclamav9 0.103.2+dfsg-0ubuntu0.18.04.2

Ubuntu 16.04 ESM:
clamav 0.103.2+dfsg-0ubuntu0.16.04.1+esm1
libclamav9 0.103.2+dfsg-0ubuntu0.16.04.1+esm1

Ubuntu 14.04 ESM:
clamav 0.103.2+dfsg-0ubuntu0.14.04.1+esm2
libclamav9 0.103.2+dfsg-0ubuntu0.14.04.1+esm2

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-4918-3
  https://ubuntu.com/security/notices/USN-4918-1
  https://launchpad.net/bugs/1926300

Package Information:
  https://launchpad.net/ubuntu/+source/clamav/0.103.2+dfsg-1ubuntu0.21.04.1
  https://launchpad.net/ubuntu/+source/clamav/0.103.2+dfsg-0ubuntu0.20.10.2
  https://launchpad.net/ubuntu/+source/clamav/0.103.2+dfsg-0ubuntu0.20.04.2
  https://launchpad.net/ubuntu/+source/clamav/0.103.2+dfsg-0ubuntu0.18.04.2