Fix systemd vulnerabilities: CVE-2018-16864, CVE-2018-16865 and CVE-2018-16866
_Originally created by @intrigeri on [#16352 (Redmine)](https://public-redmine-archive.tails.boum.org/code/issues/16352)_
- <https://security-tracker.debian.org/tracker/CVE-2018-16864>
- <https://security-tracker.debian.org/tracker/CVE-2018-16865>
- fixed in systemd/240-4
- 239-12\~bpo9+1 is most likely affected
Feature Branch: bugfix/16352-16184-systemd-v240+force-all-tests
### Attachments
* [tails-amd64-bugfix_16352-16184-systemd-v240+force-all-tests-3.12-20190114T1422Z-26671c6e2c.buildlog.xz](https://redmine.tails.boum.org/code/attachments/download/2268/tails-amd64-bugfix_16352-16184-systemd-v240+force-all-tests-3.12-20190114T1422Z-26671c6e2c.buildlog.xz)
### Related issues
- **Related to** tails/tails#16184
- **Blocks** tails/accounting#15507
- [x] **Blocked by** tails/tails#16349
- [x] **Blocked by** tails/tails#16097
- [x] **Blocked by** tails/tails#16073
- [x] **Blocked by** tails/tails#16072
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