[Bug 1150737] Re: live-build causes installation old /sbin/initctl and start-stop-daemon to be installed in Cloud Images

[David Medberry]

It doesn't look like the Ubuntu version has synced with Debian in some
time. I can't tell by examining https://launchpad.net/ubuntu/+source
/live-build why that is the case. I think Ben marked it as fix-committed
for the build system (but not for the actual ubuntu package.)

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https://bugs.launchpad.net/bugs/1150737

Title:
  live-build causes installation old /sbin/initctl and start-stop-daemon
  to be installed in Cloud Images

Status in “live-build” package in Ubuntu:
  Fix Committed
Status in “live-build” package in Debian:
  Fix Released

Bug description:
  I've encountered at least five different Amazon AMIs which all fail
  debsums right out of the box.  The offending binaries are upstart:
  /sbin/initctl and dpkg: /sbin/start-stop-daemon. Both are handy
  locations to drop a rootkit. Most prominently, the banner-choice for
  the GUI AWS console wizard in us-east-1 is ami-3fec7956, which seems
  to be created by Canonical (ami-3fec7956
  099720109477/ubuntu/images/ebs/ubuntu-
  precise-12.04-amd64-server-20130124).

  us-east-1: ami-3fec7956, ami-de0d9eb7
  us-west-1: ami-b81230fd
  us-west-2: ami-da1810ae
  ap-northeast-1: ami-77cf4976

  I analyzed only initctl, as it was the first to trip my alarms.  In
  the following examples, the left side is the one from the upstart
  package version dpkg claims to have installed, the right is the one
  actually on the system.

  * A side-by-side hex/ascii of the diff : http://pastebin.com/raw.php?i=JGN1rMC5
  * The same, with some color: http://cl.ly/image/2x2l3S1j1f38
  * A side-by-side comparison of objdump --disassemble-all: http://pastebin.com/raw.php?i=5ppcJG2H
  * The same, with some color: http://cl.ly/image/2d0w1I3W083x

  The file size is the same, but clearly it is not the one from the
  package.  objdump interpreted this delta as having a mov instruction,
  then executing a conditional jump.  This "looks" scary, but I'm no
  expert.  This may be only a side-effect of trying to disassemble code.

  This is either malicious, or a totally benign mistake, but in either
  case, Canonical should not be distributing AMIs which cannot pass
  rudimentary integrity checks.

  To reproduce, simply start an AWS instance with one of these AMIs,
  install debsums, and run something like:

  for PKG in `dpkg --get-selections | awk '{print $1}'`; do echo ${PKG}:
  >> failsums; debsums $PKG | grep FAILED >> failsums; done

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