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Gentoo Linux Security Advisory                           GLSA 201701-29
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: Vim, gVim: Remote execution of arbitrary code
     Date: January 11, 2017
     Bugs: #600650
       ID: 201701-29

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Synopsis
========

A vulnerability has been found in Vim and gVim concerning how certain
modeline options are treated.

Background
==========

Vim is an efficient, highly configurable improved version of the
classic 'vi' text editor. gVim is the GUI version of Vim.

Affected packages
=================

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  app-editors/vim             < 8.0.0106               >= 8.0.0106
  2  app-editors/gvim            < 8.0.0106               >= 8.0.0106
    -------------------------------------------------------------------
     2 affected packages

Description
===========

Vim and gVim do not properly validate values for the 'filetype',
'syntax', and 'keymap' options.

Impact
======

A remote attacker could entice a user to open a specially crafted file
using Vim/gVim with certain modeline options enabled possibly resulting
in execution of arbitrary code with the privileges of the process.

Workaround
==========

Disabling modeline support in .vimrc by adding "set nomodeline" will
prevent exploitation of this flaw. By default, modeline is enabled for
ordinary users but disabled for root.

Resolution
==========

All Vim users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=app-editors/vim-8.0.0106"

All gVim users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=app-editors/gvim-8.0.0106"

References
==========

[ 1 ] CVE-2016-1248
      https://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-1248

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

 https://security.gentoo.org/glsa/201701-29

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======

Copyright 2017 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/2.5