Ubuntu Security Notice 4058-2 - USN-4058-1 fixed a vulnerability in bash. This update provides the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM. It was discovered that Bash incorrectly handled the restricted shell. An attacker could possibly use this issue to escape restrictions and execute any command. Various other issues were also addressed.
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Ubuntu Security Notice USN-4058-2
August 05, 2019
bash vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM
Summary:
A system hardening measure could be bypassed.
Software Description:
- bash: GNU Bourne Again SHell
Details:
USN-4058-1 fixed a vulnerability in bash. This update provides
the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.
Original advisory details:
It was discovered that Bash incorrectly handled the restricted shell. An
attacker could possibly use this issue to escape restrictions and execute
any command.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 14.04 ESM:
bash 4.3-7ubuntu1.8+esm1
Ubuntu 12.04 ESM:
bash 4.2-2ubuntu2.8
In general, a standard system update will make all the necessary changes.
References:
https://usn.ubuntu.com/4058-2
https://usn.ubuntu.com/4058-1
CVE-2019-9924