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[Launchpad Bug Tracker <1628687@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package systemd - 231-9

---------------
systemd (231-9) unstable; urgency=medium

  * pid1: process zero-length notification messages again.
    Just remove the assertion, the "n" value was not used anyway. This fixes
    a local DoS due to unprocessed/unclosed fds which got introduced by the
    previous fix. (Closes: #839171) (LP: #1628687)
  * pid1: Robustify manager_dispatch_notify_fd()
  * test/networkd-test.py: Add missing writeConfig() helper function.

 -- Martin Pitt <martin.pitt@xxxxxxxxxx>  Thu, 29 Sep 2016 23:39:24
+0200

** Changed in: systemd (Ubuntu Yakkety)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1628687

Title:
  Assertion failure when PID 1 receives a zero-length message over
  notify socket

Status in systemd:
  New
Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  In Progress
Status in systemd source package in Yakkety:
  Fix Released

Bug description:
  Environment:

  Xenial 16.04.1
  Amd64

  Description.

  Systemd fails an assertion in manager_invoke_notify_message when a
  zero-length message is received over /run/systemd/notify. This allows
  a local user to perform a denial-of-service attack against PID 1.

  How to trigger the bug:

  $ while true; do NOTIFY_SOCKET=/run/systemd/notify systemd-notify "";
  done

  The following entries are written into /var/log/syslog, at this point
  systemd is crashed.

  Sep 28 20:57:20 ubuntu systemd[1]: Started User Manager for UID 1000.
  Sep 28 20:57:28 ubuntu systemd[1]: Assertion 'n > 0' failed at ../src/core/manager.c:1501, function manager_invoke_notify_message(). Aborting.
  Sep 28 20:57:29 ubuntu systemd[1]: Caught <ABRT>, dumped core as pid 1307.
  Sep 28 20:57:29 ubuntu systemd[1]: Freezing execution.

  
  Public bug: https://github.com/systemd/systemd/issues/4234

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