From: Jakub Narebski <jnareb@gmail.com>
Date: Sat, 20 Dec 2008 10:54:25 GMT
Subject: Re: [Security] gitweb local privilege escalation (fix)
Message-ID: <m3myerce39.fsf@localhost.localdomain>
In-Reply-To: <7vhc4z1gys.fsf@gitster.siamese.dyndns.org>

Junio C Hamano <gitster@pobox.com> writes:

> Current gitweb has a possible local privilege escalation bug that allows a
> malicious repository owner to run a command of his choice by specifying
> diff.external configuration variable in his repository and running a
> crafted gitweb query.
> 
> Recent (post 1.4.3) gitweb itself never generates a link that would result
> in such a query, and the safest and cleanest fix to this issue is to
> simply drop the support for it.  Maintenance release v1.6.0.6, v1.5.6.6,
> v1.5.5.6 and v1.5.4.7 are already available at k.org (see the announcement
> for v1.6.0.6 I sent out a few minutes ago), and the master branch and
> others pushed out tonight have the same fix.

>From what I have found diff.external works only since v1.5.4 (see
commit cbe02100), so when gitweb started using git-diff for old
legacy links to not use $tmpdir and /usr/bin/diff -u it wasn't an
issue...

-- 
Jakub Narebski
Poland
ShadeHawk on #git