=========================================================================Ubuntu Security Notice USN-5133-1
November 04, 2021

A security issue was fixed in ICU
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

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

Summary:

ICU could be made to crash if it received specially crafted
input.

Software Description:
- icu: International Components for Unicode library

Details:

It was discovered that ICU contains a use after free issue.
An attacker could use this issue to cause a denial of service with 
crafted input.

Update instructions:

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

Ubuntu 18.04 LTS:
icu-devtools 60.2-3ubuntu3.2
libicu60 60.2-3ubuntu3.2
libiculx60 60.2-3ubuntu3.2

Ubuntu 16.04 ESM:
icu-devtools 55.1-7ubuntu0.5+esm1
libicu55 55.1-7ubuntu0.5+esm1

Ubuntu 14.04 ESM:
icu-devtools 52.1-3ubuntu0.8+esm2
libicu52 52.1-3ubuntu0.8+esm2

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

References:
https://ubuntu.com/security/notices/USN-5133-1
CVE-2020-21913

Package Information:
https://launchpad.net/ubuntu/+source/icu/60.2-3ubuntu3.2