kernel-packages team mailing list archive

[Kamal Mostafa <kamal@xxxxxxxxxxxxx>]

This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
xenial' to 'verification-done-xenial'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!

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https://bugs.launchpad.net/bugs/1595350

Title:
  Linux netfilter local privilege escalation issues

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  The upstream stable rc git tree
  (http://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable-
  rc.git/log/?h=linux-4.6.y) currently has the following commits for
  netfilter that address (with unprivileged user namespaces enabled)
  local privilege escalation. These are the commit references in linus'
  tree:

  f24e230d257af1ad7476c6e81a8dc3127a74204e
     netfilter: x_tables: don't move to non-existent next rule
  36472341017529e2b12573093cc0f68719300997
     netfilter: x_tables: validate targets of jumps
  7d35812c3214afa5b37a675113555259cfd67b98
     netfilter: x_tables: add and use xt_check_entry_offsets
  aa412ba225dd3bc36d404c28cdc3d674850d80d0
     netfilter: x_tables: kill check_entry helper
  a08e4e190b866579896c09af59b3bdca821da2cd
     netfilter: x_tables: assert minimum target size
  fc1221b3a163d1386d1052184202d5dc50d302d1
     netfilter: x_tables: add compat version of xt_check_entry_offsets
  7ed2abddd20cf8f6bd27f65bd218f26fa5bf7f44
     netfilter: x_tables: check standard target size too
  ce683e5f9d045e5d67d1312a42b359cb2ab2a13c
     netfilter: x_tables: check for bogus target offset
  13631bfc604161a9d69cd68991dff8603edd66f9
     netfilter: x_tables: validate all offsets and sizes in a rule
  7b7eba0f3515fca3296b8881d583f7c1042f5226
     netfilter: x_tables: don't reject valid target size on some architectures
  8dddd32756f6fe8e4e82a63361119b7e2384e02f
     netfilter: arp_tables: simplify translate_compat_table args
  7d3f843eed29222254c9feab481f55175a1afcc9
     netfilter: ip_tables: simplify translate_compat_table args
  329a0807124f12fe1c8032f95d8a8eb47047fb0e
     netfilter: ip6_tables: simplify translate_compat_table args
  0188346f21e6546498c2a0f84888797ad4063fc5
     netfilter: x_tables: xt_compat_match_from_user doesn't need a retval
  09d9686047dbbe1cf4faa558d3ecc4aae2046054
     netfilter: x_tables: do compat validation via translate_table
  d7591f0c41ce3e67600a982bab6989ef0f07b3ce
     netfilter: x_tables: introduce and use xt_copy_counters_from_user

  They have also been backported to the 4.4
  (http://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable-
  rc.git/log/?h=linux-4.4.y) and 3.14
  (http://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable-
  rc.git/log/?h=linux-3.14.y) stable trees, with 3 additional
  prerequisite backported commits:

  bdf533de6968e9686df777dc178486f600c6e617
     netfilter: x_tables: validate e->target_offset early
  6e94e0cfb0887e4013b3b930fa6ab1fe6bb6ba91
     netfilter: x_tables: make sure e->next_offset covers remaining blob size
  54d83fc74aa9ec72794373cb47432c5f7fb1a309
     netfilter: x_tables: fix unconditional helper

  CRD: Public

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