Bug 1398227 – CVE-2016-1248 vim: Lack of validation of values for few options results in code exection

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Bug 1398227 - (CVE-2016-1248) CVE-2016-1248 vim: Lack of validation of values for few options results in code exection

Summary:	CVE-2016-1248 vim: Lack of validation of values for few options results in co...

Status:	CLOSED ERRATA

Aliases:	CVE-2016-1248

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=moderate,public=20161120,repor...
Keywords:	Security

Depends On:	1398228 1399008 1399009 1399010 1399011
Blocks:	1398230
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Reported:	2016-11-24 05:15 EST by Andrej Nemec
Modified:	2016-12-21 19:43 EST (History)
CC List:	8 users (show)

See Also:
Fixed In Version:	vim 8.0.0056
Doc Type:	If docs needed, set a value
Doc Text:	A vulnerability was found in vim in how certain modeline options were treated. An attacker could craft a file that, when opened in vim with modelines enabled, could execute arbitrary commands with privileges of the user running vim.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2016-12-21 19:43:00 EST
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2016:2972	normal	SHIPPED_LIVE	Moderate: vim security update	2016-12-21 02:08:53 EST

Groups: None (edit)

Description Andrej Nemec 2016-11-24 05:15:02 EST

A vulnerability was found in Vim which would allow arbitrary shell commands to be run if a user opened a file with a malicious modeline.  This is due to lack of validation of values for a few options.  Those options' values are then used in Vim's scripts to build a command string that's evaluated by :execute, which is what allows the shell commands to be run.

Upstream patch:

https://github.com/vim/vim/commit/d0b5138ba4bccff8a744c99836041ef6322ed39a

References:

http://seclists.org/oss-sec/2016/q4/506

Comment 1 Andrej Nemec 2016-11-24 05:15:30 EST

Created vim tracking bugs for this issue:

Affects: fedora-all [bug 1398228]

Comment 2 Doran Moppert 2016-11-27 22:19:29 EST

Mitigation:

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.

Comment 10 errata-xmlrpc 2016-12-20 21:09:07 EST

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6
  Red Hat Enterprise Linux 7

Via RHSA-2016:2972 https://rhn.redhat.com/errata/RHSA-2016-2972.html

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