[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #5243 Fix secu

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[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #5243 Fix security problem in lilypond-invoke-editor

Date:

Mon, 22 Jan 2018 15:22:55 -0000

Patch counted down - please push

[issues:#5243] Fix security problem in lilypond-invoke-editor

Status: Started
Created: Thu Nov 23, 2017 08:35 AM UTC by Knut Petersen
Last Updated: Fri Jan 19, 2018 07:34 PM UTC
Owner: David Kastrup

David Kastrup - 22 hours ago

More conservative parsing of textedit URIs

Also contains commits:

Let get-editor use shell-quote-argument

Addresses security concerns.

(editor scm): Add shell-quote-argument function

This is mostly stolen from Emacs.

I have no idea how to properly test this or whether it runs at all.

http://codereview.appspot.com/336450043

Initial issue for this Tracker (replace by the info above):
Fix security problem in lilypond-invoke-editor

If lilypond-invoke-editor was installed as a general
uri-helper it was easy to abuse it to execute arbitrary
code on an attacked system for non-textedit URIs.
This part of the problem was discovered and reported
to our bug-lilypond mailing list by Gabriel Corona.

But also pure textedit URIs were vulnerable, an
example is the URI

textedit:///:&xterm -e find ~/&:x:

that executes "find ~/" in a xterm.

With this patch lilypond-invoke-editor only
handles textedit URIs, and it does no longer
use the systems command processor but
guiles system* procedure for those URIs.

Also the script will abort if the line, char and
column fields of a textedit URI contain anything
but digits.

We could have fixed URI passing to the browser,
but it is not our job to provide a general URI helper.
Other software (e.g. xdg-open and friends) should
be used for that.

The security problem fixed now was introduced
into lilypond in the year 2005.

Signed-off-by: Knut Petersen address@hidden

http://codereview.appspot.com/336240043

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