A Bash 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-5380-1
April 20, 2022
bash 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:
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
