[USN-5380-1] Bash vulnerability

[David Fernandez Gonzalez]

==========================================================================
Ubuntu Security Notice USN-5380-1
April 20, 2022

bash vulnerability
==========================================================================

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:

Bash could be used to escalate privileges.

Software Description:
- bash: GNU Bourne Again SHell

Details:

It was discovered that Bash did not properly drop privileges
when the binary had the setuid bit enabled. An attacker could
possibly use this issue to escalate privileges.

Update instructions:

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

Ubuntu 20.04 LTS:
   bash                            5.0-6ubuntu1.2

Ubuntu 18.04 LTS:
   bash                            4.4.18-2ubuntu1.3

Ubuntu 16.04 ESM:
   bash                            4.3-14ubuntu1.4+esm1

Ubuntu 14.04 ESM:
   bash                            4.3-7ubuntu1.8+esm2

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

References:
   https://ubuntu.com/security/notices/USN-5380-1
   CVE-2019-18276

Package Information:
   https://launchpad.net/ubuntu/+source/bash/5.0-6ubuntu1.2
   https://launchpad.net/ubuntu/+source/bash/4.4.18-2ubuntu1.3

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