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[Bug 1547400] Re: aufs fails to handle sanitize xattrs in workdir, copies SUID binaries from no-suid fuse mounts

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: halfdog <me@xxxxxxxxxxx>
Date: Fri, 06 May 2016 17:19:52 -0000
Reply-to: Bug 1547400 <1547400@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-2854

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-2853

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https://bugs.launchpad.net/bugs/1547400

Title:
  aufs fails to handle sanitize xattrs in workdir, copies SUID binaries
  from no-suid fuse mounts

Status in Linux:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed
Status in linux-armadaxp package in Ubuntu:
  Invalid
Status in linux-flo package in Ubuntu:
  New
Status in linux-goldfish package in Ubuntu:
  New
Status in linux-lts-quantal package in Ubuntu:
  Invalid
Status in linux-lts-raring package in Ubuntu:
  Invalid
Status in linux-lts-saucy package in Ubuntu:
  Invalid
Status in linux-lts-trusty package in Ubuntu:
  Invalid
Status in linux-lts-utopic package in Ubuntu:
  Invalid
Status in linux-lts-vivid package in Ubuntu:
  Invalid
Status in linux-lts-wily package in Ubuntu:
  Invalid
Status in linux-lts-xenial package in Ubuntu:
  Invalid
Status in linux-mako package in Ubuntu:
  New
Status in linux-manta package in Ubuntu:
  Invalid
Status in linux-raspi2 package in Ubuntu:
  New
Status in linux-snapdragon package in Ubuntu:
  New
Status in linux-ti-omap4 package in Ubuntu:
  Invalid
Status in linux source package in Precise:
  New
Status in linux-armadaxp source package in Precise:
  New
Status in linux-flo source package in Precise:
  Invalid
Status in linux-goldfish source package in Precise:
  Invalid
Status in linux-lts-quantal source package in Precise:
  Invalid
Status in linux-lts-raring source package in Precise:
  Invalid
Status in linux-lts-saucy source package in Precise:
  Invalid
Status in linux-lts-trusty source package in Precise:
  New
Status in linux-lts-utopic source package in Precise:
  Invalid
Status in linux-lts-vivid source package in Precise:
  Invalid
Status in linux-lts-wily source package in Precise:
  Invalid
Status in linux-lts-xenial source package in Precise:
  Invalid
Status in linux-mako source package in Precise:
  Invalid
Status in linux-manta source package in Precise:
  Invalid
Status in linux-raspi2 source package in Precise:
  Invalid
Status in linux-snapdragon source package in Precise:
  Invalid
Status in linux-ti-omap4 source package in Precise:
  New
Status in linux source package in Trusty:
  New
Status in linux-armadaxp source package in Trusty:
  Invalid
Status in linux-flo source package in Trusty:
  Invalid
Status in linux-goldfish source package in Trusty:
  Invalid
Status in linux-lts-quantal source package in Trusty:
  Invalid
Status in linux-lts-raring source package in Trusty:
  Invalid
Status in linux-lts-saucy source package in Trusty:
  Invalid
Status in linux-lts-trusty source package in Trusty:
  Invalid
Status in linux-lts-utopic source package in Trusty:
  New
Status in linux-lts-vivid source package in Trusty:
  New
Status in linux-lts-wily source package in Trusty:
  New
Status in linux-lts-xenial source package in Trusty:
  New
Status in linux-mako source package in Trusty:
  Invalid
Status in linux-manta source package in Trusty:
  Invalid
Status in linux-raspi2 source package in Trusty:
  Invalid
Status in linux-snapdragon source package in Trusty:
  Invalid
Status in linux-ti-omap4 source package in Trusty:
  Invalid
Status in linux source package in Wily:
  New
Status in linux-armadaxp source package in Wily:
  Invalid
Status in linux-flo source package in Wily:
  New
Status in linux-goldfish source package in Wily:
  New
Status in linux-lts-quantal source package in Wily:
  Invalid
Status in linux-lts-raring source package in Wily:
  Invalid
Status in linux-lts-saucy source package in Wily:
  Invalid
Status in linux-lts-trusty source package in Wily:
  Invalid
Status in linux-lts-utopic source package in Wily:
  Invalid
Status in linux-lts-vivid source package in Wily:
  Invalid
Status in linux-lts-wily source package in Wily:
  Invalid
Status in linux-lts-xenial source package in Wily:
  Invalid
Status in linux-mako source package in Wily:
  New
Status in linux-manta source package in Wily:
  New
Status in linux-raspi2 source package in Wily:
  New
Status in linux-snapdragon source package in Wily:
  Invalid
Status in linux-ti-omap4 source package in Wily:
  Invalid
Status in linux source package in Xenial:
  Confirmed
Status in linux-armadaxp source package in Xenial:
  Invalid
Status in linux-flo source package in Xenial:
  New
Status in linux-goldfish source package in Xenial:
  New
Status in linux-lts-quantal source package in Xenial:
  Invalid
Status in linux-lts-raring source package in Xenial:
  Invalid
Status in linux-lts-saucy source package in Xenial:
  Invalid
Status in linux-lts-trusty source package in Xenial:
  Invalid
Status in linux-lts-utopic source package in Xenial:
  Invalid
Status in linux-lts-vivid source package in Xenial:
  Invalid
Status in linux-lts-wily source package in Xenial:
  Invalid
Status in linux-lts-xenial source package in Xenial:
  Invalid
Status in linux-mako source package in Xenial:
  New
Status in linux-manta source package in Xenial:
  Invalid
Status in linux-raspi2 source package in Xenial:
  New
Status in linux-snapdragon source package in Xenial:
  New
Status in linux-ti-omap4 source package in Xenial:
  Invalid
Status in linux source package in Yakkety:
  Confirmed
Status in linux-armadaxp source package in Yakkety:
  Invalid
Status in linux-flo source package in Yakkety:
  New
Status in linux-goldfish source package in Yakkety:
  New
Status in linux-lts-quantal source package in Yakkety:
  Invalid
Status in linux-lts-raring source package in Yakkety:
  Invalid
Status in linux-lts-saucy source package in Yakkety:
  Invalid
Status in linux-lts-trusty source package in Yakkety:
  Invalid
Status in linux-lts-utopic source package in Yakkety:
  Invalid
Status in linux-lts-vivid source package in Yakkety:
  Invalid
Status in linux-lts-wily source package in Yakkety:
  Invalid
Status in linux-lts-xenial source package in Yakkety:
  Invalid
Status in linux-mako source package in Yakkety:
  New
Status in linux-manta source package in Yakkety:
  Invalid
Status in linux-raspi2 source package in Yakkety:
  New
Status in linux-snapdragon source package in Yakkety:
  New
Status in linux-ti-omap4 source package in Yakkety:
  Invalid

Bug description:
  When aufs module is loaded with "modprobe aufs allow_userns",
  unprivileged user can use xattrs on the working directory or aufs
  mount over a fuse mount to create SUID/SGID binaries, thus escalating
  privileges. These errors are quite similar to those on overlayfs:

  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1535150
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1534961

  aufs developers have already confirmed and issued a fix:

  https://sourceforge.net/p/aufs/mailman/message/34864744/

  Specific reproducers can be found at:

  http://www.halfdog.net/Security/2016/AufsPrivilegeEscalationInUserNamespaces/
  InvitedOnly AkgY8iqF

  # lsb_release -rd
  Description:    Ubuntu 15.10
  Release:        15.10

  # apt-cache policy linux-image-4.2.0-27-generic
  linux-image-4.2.0-27-generic:
    Installed: 4.2.0-27.32
    Candidate: 4.2.0-27.32
    Version table:
   *** 4.2.0-27.32 0
          500 http://archive.ubuntu.com/ubuntu/ wily-updates/main amd64 Packages
          500 http://archive.ubuntu.com/ubuntu/ wily-security/main amd64 Packages
          100 /var/lib/dpkg/status

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