An usbredir security update has been released for Ubuntu 14.04 ESM, 16.04 ESM, 18.04 LTS, and 20.04 LTS.

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Ubuntu Security Notice USN-5784-1
January 03, 2023

usbredir vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

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

Summary:

usbredir could be made to crash or run programs if it received
specially crafted input.

Software Description:
- usbredir: usbredir libraries and utilities

Details:

It was discovered that usbredir incorrectly handled memory when
serializing large amounts of data in the case of a slow or blocked
destination. An attacker could possibly use this issue to cause
applications using usbredir to crash, resulting in a denial of
service, or possibly execute arbitrary code.

Update instructions:

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

Ubuntu 20.04 LTS:
libusbredirhost1 0.8.0-1ubuntu0.1
libusbredirparser1 0.8.0-1ubuntu0.1
usbredirserver 0.8.0-1ubuntu0.1

Ubuntu 18.04 LTS:
libusbredirhost1 0.7.1-1ubuntu0.18.04.1
libusbredirparser1 0.7.1-1ubuntu0.18.04.1
usbredirserver 0.7.1-1ubuntu0.18.04.1

Ubuntu 16.04 ESM:
libusbredirhost1 0.7.1-1ubuntu0.16.04.1~esm1
libusbredirparser1 0.7.1-1ubuntu0.16.04.1~esm1
usbredirserver 0.7.1-1ubuntu0.16.04.1~esm1

Ubuntu 14.04 ESM:
libusbredirhost1 0.6-2ubuntu1.1+esm1
libusbredirparser1 0.6-2ubuntu1.1+esm1
usbredirserver 0.6-2ubuntu1.1+esm1

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-5784-1
CVE-2021-3700

Package Information:
https://launchpad.net/ubuntu/+source/usbredir/0.8.0-1ubuntu0.1
https://launchpad.net/ubuntu/+source/usbredir/0.7.1-1ubuntu0.18.04.1