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[Bug 1584393] Re: systemctl restart networking hangs reloading ssh.service

 

This bug was fixed in the package openssh - 1:7.2p2-4ubuntu2.1

---------------
openssh (1:7.2p2-4ubuntu2.1) xenial-security; urgency=medium

  * SECURITY UPDATE: user enumeration via covert timing channel
    - debian/patches/CVE-2016-6210-1.patch: determine appropriate salt for
      invalid users in auth-passwd.c, openbsd-compat/xcrypt.c.
    - debian/patches/CVE-2016-6210-2.patch: mitigate timing of disallowed
      users PAM logins in auth-pam.c.
    - debian/patches/CVE-2016-6210-3.patch: search users for one with a
      valid salt in openbsd-compat/xcrypt.c.
    - CVE-2016-6210
  * SECURITY UPDATE: denial of service via long passwords
    - debian/patches/CVE-2016-6515.patch: skip passwords longer than 1k in
      length in auth-passwd.c.
    - CVE-2016-6515

 -- Marc Deslauriers <marc.deslauriers@xxxxxxxxxx>  Thu, 11 Aug 2016
08:38:27 -0400

** Changed in: openssh (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-6210

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-6515

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https://bugs.launchpad.net/bugs/1584393

Title:
  systemctl restart networking hangs reloading ssh.service

Status in openssh package in Ubuntu:
  Fix Released
Status in openssh source package in Xenial:
  Fix Released
Status in openssh package in Debian:
  Fix Released

Bug description:
  Issues "systemctl restart networking" never exits. It hangs during a
  call to "systemctl reload ssh.service":

  ● networking.service - Raise network interfaces
     Loaded: loaded (/lib/systemd/system/networking.service; enabled; vendor preset: enabled)
    Drop-In: /run/systemd/generator/networking.service.d
             └─50-insserv.conf-$network.conf
     Active: activating (start) since Sat 2016-05-21 21:41:58 UTC; 18s ago
       Docs: man:interfaces(5)
    Process: 1288 ExecStop=/sbin/ifdown -a --read-environment (code=exited, status=0/SUCCESS)
    Process: 1376 ExecStartPre=/bin/sh -c [ "$CONFIGURE_INTERFACES" != "no" ] && [ -n "$(ifquery --read-environment --list --exclude=lo)" ] &
   Main PID: 1383 (ifup)
      Tasks: 7 (limit: 512)
     Memory: 1.8M
        CPU: 111ms
     CGroup: /system.slice/networking.service
             ├─1383 /sbin/ifup -a --read-environment
             ├─1479 /sbin/dhclient -1 -v -pf /run/dhclient.enp0s3.pid -lf /var/lib/dhcp/dhclient.enp0s3.leases -I -df /var/lib/dhcp/dhclient6
             ├─1480 /bin/sh -c /bin/run-parts --exit-on-error /etc/network/if-up.d
             ├─1481 /bin/run-parts --exit-on-error /etc/network/if-up.d
             ├─1504 /bin/sh /etc/network/if-up.d/openssh-server
             ├─1507 /bin/sh /usr/sbin/invoke-rc.d ssh reload
             └─1527 systemctl reload ssh.service

  Then issuing the same command from another terminal causes the first
  to exit successfully (the second also exists successfully).

  On the official vagrant image, I get this problem independently of
  whether the command is issued through and ssh session. I've gotten the
  same behavior on the official xenial AMIs.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ifupdown 0.8.10ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  Date: Sat May 21 21:35:08 2016
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ifupdown
  UpgradeStatus: No upgrade log present (probably fresh install)

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