[USN-4077-1] tmpreaper vulnerability

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Ubuntu Security Notice USN-4077-1
July 29, 2019

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

tmpreaper could be made to overwrite files as the administrator.

Software Description:
- tmpreaper: cleans up files in directories based on their age

Details:

It was discovered that tmpreaper incorrectly handled certain mount operations. A
local attacker could possibly use this issue to create arbitrary files, leading
to privilege escalation.

Update instructions:

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

Ubuntu 18.04 LTS:
tmpreaper 1.6.13+nmu1+deb9u1build0.18.04.1

Ubuntu 16.04 LTS:
tmpreaper 1.6.13+nmu1+deb9u1build0.16.04.1

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

References:
https://usn.ubuntu.com/4077-1
CVE-2019-3461

Package Information:

https://launchpad.net/ubuntu/+source/tmpreaper/1.6.13+nmu1+deb9u1build0.18.04.1

https://launchpad.net/ubuntu/+source/tmpreaper/1.6.13+nmu1+deb9u1build0.16.04.1