Bug 1490409 (CVE-2017-14482) - CVE-2017-14482 emacs: command injection flaw within "enriched mode" handling
Summary: CVE-2017-14482 emacs: command injection flaw within "enriched mode" handling
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2017-14482
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1490410 1490451 1490452
Blocks: 1490413
TreeView+ depends on / blocked
 
Reported: 2017-09-11 13:40 UTC by Andrej Nemec
Modified: 2021-02-17 01:35 UTC (History)
6 users (show)

Fixed In Version:
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Doc Text:
A command injection flaw within the Emacs "enriched mode" handling has been discovered. By tricking an unsuspecting user into opening a specially crafted file using Emacs, a remote attacker could exploit this flaw to execute arbitrary commands with the privileges of the Emacs user.
Clone Of:
Environment:
Last Closed: 2017-09-22 08:41:54 UTC
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:2771 0 normal SHIPPED_LIVE Important: emacs security update 2017-09-19 22:36:15 UTC

Description Andrej Nemec 2017-09-11 13:40:27 UTC 
Enriched mode implements an extension command to the text/enriched format called "x-display", which stores "display" text properties. It's possible to use this extension command to transparently execute arbitrary code in an Emacs process that opens a text/enriched file.

Upstream issue:

https://debbugs.gnu.org/cgi/bugreport.cgi?bug=28350

Upstream patch:

https://git.savannah.gnu.org/cgit/emacs.git/commit/?h=emacs-25&id=9ad0fcc54442a9a01d41be19880250783426db70

References:

http://seclists.org/oss-sec/2017/q3/422
Comment 1 Andrej Nemec 2017-09-11 13:40:58 UTC 
Created emacs tracking bugs for this issue:

Affects: fedora-all [bug 1490410]
Comment 5 errata-xmlrpc 2017-09-19 18:36:49 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:2771 https://access.redhat.com/errata/RHSA-2017:2771
Comment 6 Stefan Cornelius 2017-09-25 13:16:35 UTC 
Mitigation:

This issue can be mitigated by adding the following lines to the Emacs init file (for example ~/.emacs, ~/emacs.d/init.el, site-start.el) and avoiding options that would bypass normal initialization, like 'emacs -Q':

  ;; Mitigate CVE-2017-14482 in Emacs 25.2 and earlier
(require 'enriched)
(defun enriched-decode-display-prop (start end &optional param)
  (list start end))
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