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

[Auto mailings of changes to Lily Issues via Testlilyissues-auto]

• Patch: new --> needs_work
• Type: --> Enhancement
• Comment:

This now fails make - did you rebase?

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[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 Nov 24, 2017 05:57 PM UTC
Owner: Knut Petersen

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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