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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: Steve Beattie <sbeattie@xxxxxxxxxx>
Date: Mon, 07 Mar 2016 23:19:04 -0000
Reply-to: Bug 1547400 <1547400@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
** Tags added: kernel-cve-skip-description

** Also affects: linux (Ubuntu Precise)
   Importance: Undecided
       Status: New

** Also affects: linux-armadaxp (Ubuntu Precise)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-quantal (Ubuntu Precise)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-saucy (Ubuntu Precise)
   Importance: Undecided
       Status: New

** Also affects: linux-goldfish (Ubuntu Precise)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-trusty (Ubuntu Precise)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-vivid (Ubuntu Precise)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-wily (Ubuntu Precise)
   Importance: Undecided
       Status: New

** Also affects: linux-raspi2 (Ubuntu Precise)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-xenial (Ubuntu Precise)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Also affects: linux-armadaxp (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-quantal (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-saucy (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Also affects: linux-goldfish (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-trusty (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-vivid (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-wily (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Also affects: linux-raspi2 (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-xenial (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Wily)
   Importance: Undecided
       Status: New

** Also affects: linux-armadaxp (Ubuntu Wily)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-quantal (Ubuntu Wily)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-saucy (Ubuntu Wily)
   Importance: Undecided
       Status: New

** Also affects: linux-goldfish (Ubuntu Wily)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-trusty (Ubuntu Wily)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-vivid (Ubuntu Wily)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-wily (Ubuntu Wily)
   Importance: Undecided
       Status: New

** Also affects: linux-raspi2 (Ubuntu Wily)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-xenial (Ubuntu Wily)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Xenial)
   Importance: Medium
       Status: Confirmed

** Also affects: linux-armadaxp (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-quantal (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-saucy (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: linux-goldfish (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-trusty (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-vivid (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-wily (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: linux-raspi2 (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-xenial (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux-lts-trusty (Ubuntu Precise)
   Importance: Undecided => Low

** Changed in: linux-lts-trusty (Ubuntu Wily)
       Status: New => Invalid

** Changed in: linux-lts-trusty (Ubuntu Wily)
   Importance: Undecided => Low

** Changed in: linux-lts-trusty (Ubuntu Xenial)
       Status: New => Invalid

** Changed in: linux-lts-trusty (Ubuntu Xenial)
   Importance: Undecided => Low

** Changed in: linux-lts-trusty (Ubuntu Trusty)
       Status: New => Invalid

** Changed in: linux-lts-trusty (Ubuntu Trusty)
   Importance: Undecided => Low

** Changed in: linux-lts-wily (Ubuntu Precise)
       Status: New => Invalid

** Changed in: linux-lts-wily (Ubuntu Precise)
   Importance: Undecided => Low

** Changed in: linux-lts-wily (Ubuntu Wily)
       Status: New => Invalid

** Changed in: linux-lts-wily (Ubuntu Wily)
   Importance: Undecided => Low

** Changed in: linux-lts-wily (Ubuntu Xenial)
       Status: New => Invalid

** Changed in: linux-lts-wily (Ubuntu Xenial)
   Importance: Undecided => Low

** Changed in: linux-lts-wily (Ubuntu Trusty)
   Importance: Undecided => Low

** Changed in: linux-lts-quantal (Ubuntu Precise)
       Status: New => Invalid

** Changed in: linux-lts-quantal (Ubuntu Precise)
   Importance: Undecided => Low

** Changed in: linux-lts-quantal (Ubuntu Wily)
       Status: New => Invalid

** Changed in: linux-lts-quantal (Ubuntu Wily)
   Importance: Undecided => Low

** Changed in: linux-lts-quantal (Ubuntu Xenial)
       Status: New => Invalid

** Changed in: linux-lts-quantal (Ubuntu Xenial)
   Importance: Undecided => Low

** Changed in: linux-lts-quantal (Ubuntu Trusty)
       Status: New => Invalid

** Changed in: linux-lts-quantal (Ubuntu Trusty)
   Importance: Undecided => Low

** Changed in: linux (Ubuntu Precise)
   Importance: Undecided => Low

** Changed in: linux (Ubuntu Wily)
   Importance: Undecided => Low

** Changed in: linux (Ubuntu Xenial)
   Importance: Medium => Low

** Changed in: linux (Ubuntu Trusty)
   Importance: Undecided => Low

** Changed in: linux-ti-omap4 (Ubuntu Precise)
   Importance: Undecided => Low

** Changed in: linux-ti-omap4 (Ubuntu Wily)
       Status: New => Invalid

** Changed in: linux-ti-omap4 (Ubuntu Wily)
   Importance: Undecided => Low

** Changed in: linux-ti-omap4 (Ubuntu Xenial)
       Status: New => Invalid

** Changed in: linux-ti-omap4 (Ubuntu Xenial)
   Importance: Undecided => Low

** Changed in: linux-ti-omap4 (Ubuntu Trusty)
       Status: New => Invalid

** Changed in: linux-ti-omap4 (Ubuntu Trusty)
   Importance: Undecided => Low

** Changed in: linux-lts-raring (Ubuntu Precise)
       Status: New => Invalid

** Changed in: linux-lts-raring (Ubuntu Precise)
   Importance: Undecided => Low

** Changed in: linux-lts-raring (Ubuntu Wily)
       Status: New => Invalid

** Changed in: linux-lts-raring (Ubuntu Wily)
   Importance: Undecided => Low

** Changed in: linux-lts-raring (Ubuntu Xenial)
       Status: New => Invalid

** Changed in: linux-lts-raring (Ubuntu Xenial)
   Importance: Undecided => Low

** Changed in: linux-lts-raring (Ubuntu Trusty)
       Status: New => Invalid

** Changed in: linux-lts-raring (Ubuntu Trusty)
   Importance: Undecided => Low

** Changed in: linux-armadaxp (Ubuntu Precise)
   Importance: Undecided => Low

** Changed in: linux-armadaxp (Ubuntu Wily)
       Status: New => Invalid

** Changed in: linux-armadaxp (Ubuntu Wily)
   Importance: Undecided => Low

** Changed in: linux-armadaxp (Ubuntu Xenial)
       Status: New => Invalid

** Changed in: linux-armadaxp (Ubuntu Xenial)
   Importance: Undecided => Low

** Changed in: linux-armadaxp (Ubuntu Trusty)
       Status: New => Invalid

** Changed in: linux-armadaxp (Ubuntu Trusty)
   Importance: Undecided => Low

** Changed in: linux-lts-xenial (Ubuntu Precise)
       Status: New => Invalid

** Changed in: linux-lts-xenial (Ubuntu Precise)
   Importance: Undecided => Low

** Changed in: linux-lts-xenial (Ubuntu Wily)
       Status: New => Invalid

** Changed in: linux-lts-xenial (Ubuntu Wily)
   Importance: Undecided => Low

** Changed in: linux-lts-xenial (Ubuntu Xenial)
       Status: New => Invalid

** Changed in: linux-lts-xenial (Ubuntu Xenial)
   Importance: Undecided => Low

** Changed in: linux-lts-xenial (Ubuntu Trusty)
   Importance: Undecided => Low

** Changed in: linux-lts-saucy (Ubuntu Precise)
       Status: New => Invalid

** Changed in: linux-lts-saucy (Ubuntu Precise)
   Importance: Undecided => Low

** Changed in: linux-lts-saucy (Ubuntu Wily)
       Status: New => Invalid

** Changed in: linux-lts-saucy (Ubuntu Wily)
   Importance: Undecided => Low

** Changed in: linux-lts-saucy (Ubuntu Xenial)
       Status: New => Invalid

** Changed in: linux-lts-saucy (Ubuntu Xenial)
   Importance: Undecided => Low

** Changed in: linux-lts-saucy (Ubuntu Trusty)
       Status: New => Invalid

** Changed in: linux-lts-saucy (Ubuntu Trusty)
   Importance: Undecided => Low

** Changed in: linux-manta (Ubuntu Precise)
       Status: New => Invalid

** Changed in: linux-manta (Ubuntu Precise)
   Importance: Undecided => Low

** Changed in: linux-manta (Ubuntu Wily)
   Importance: Undecided => Low

** Changed in: linux-manta (Ubuntu Xenial)
   Importance: Undecided => Low

** Changed in: linux-manta (Ubuntu Trusty)
       Status: New => Invalid

** Changed in: linux-manta (Ubuntu Trusty)
   Importance: Undecided => Low

** Changed in: linux-lts-vivid (Ubuntu Precise)
       Status: New => Invalid

** Changed in: linux-lts-vivid (Ubuntu Precise)
   Importance: Undecided => Low

** Changed in: linux-lts-vivid (Ubuntu Wily)
       Status: New => Invalid

** Changed in: linux-lts-vivid (Ubuntu Wily)
   Importance: Undecided => Low

** Changed in: linux-lts-vivid (Ubuntu Xenial)
       Status: New => Invalid

** Changed in: linux-lts-vivid (Ubuntu Xenial)
   Importance: Undecided => Low

** Changed in: linux-lts-vivid (Ubuntu Trusty)
   Importance: Undecided => Low

** Changed in: linux-raspi2 (Ubuntu Precise)
       Status: New => Invalid

** Changed in: linux-raspi2 (Ubuntu Precise)
   Importance: Undecided => Low

** Changed in: linux-raspi2 (Ubuntu Wily)
   Importance: Undecided => Low

** Changed in: linux-raspi2 (Ubuntu Xenial)
   Importance: Undecided => Low

** Changed in: linux-raspi2 (Ubuntu Trusty)
       Status: New => Invalid

** Changed in: linux-raspi2 (Ubuntu Trusty)
   Importance: Undecided => Low

** Changed in: linux-mako (Ubuntu Precise)
       Status: New => Invalid

** Changed in: linux-mako (Ubuntu Precise)
   Importance: Undecided => Low

** Changed in: linux-mako (Ubuntu Wily)
   Importance: Undecided => Low

** Changed in: linux-mako (Ubuntu Xenial)
   Importance: Undecided => Low

** Changed in: linux-mako (Ubuntu Trusty)
       Status: New => Invalid

** Changed in: linux-mako (Ubuntu Trusty)
   Importance: Undecided => Low

** Changed in: linux-lts-utopic (Ubuntu Precise)
       Status: New => Invalid

** Changed in: linux-lts-utopic (Ubuntu Precise)
   Importance: Undecided => Low

** Changed in: linux-lts-utopic (Ubuntu Wily)
       Status: New => Invalid

** Changed in: linux-lts-utopic (Ubuntu Wily)
   Importance: Undecided => Low

** Changed in: linux-lts-utopic (Ubuntu Xenial)
       Status: New => Invalid

** Changed in: linux-lts-utopic (Ubuntu Xenial)
   Importance: Undecided => Low

** Changed in: linux-lts-utopic (Ubuntu Trusty)
   Importance: Undecided => Low

** Changed in: linux-goldfish (Ubuntu Precise)
       Status: New => Invalid

** Changed in: linux-goldfish (Ubuntu Precise)
   Importance: Undecided => Low

** Changed in: linux-goldfish (Ubuntu Wily)
   Importance: Undecided => Low

** Changed in: linux-goldfish (Ubuntu Xenial)
   Importance: Undecided => Low

** Changed in: linux-goldfish (Ubuntu Trusty)
       Status: New => Invalid

** Changed in: linux-goldfish (Ubuntu Trusty)
   Importance: Undecided => Low

** Changed in: linux-flo (Ubuntu Precise)
       Status: New => Invalid

** Changed in: linux-flo (Ubuntu Precise)
   Importance: Undecided => Low

** Changed in: linux-flo (Ubuntu Wily)
   Importance: Undecided => Low

** Changed in: linux-flo (Ubuntu Xenial)
   Importance: Undecided => Low

** Changed in: linux-flo (Ubuntu Trusty)
       Status: New => Invalid

** Changed in: linux-flo (Ubuntu Trusty)
   Importance: Undecided => Low

-- 
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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:
  New
Status in linux-raspi2 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-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-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-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:
  New
Status in linux-raspi2 source package in Xenial:
  New
Status in linux-ti-omap4 source package in Xenial:
  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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