[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Mon, 2 Jul 2018 16:10:24 +0200
From: Jakub Wilk <jwilk@...lk.net>
To: oss-security@...ts.openwall.com
Subject: Re: accountsservice: insufficient path check in
user_change_icon_file_authorized_cb()
* Matthias Gerstner <mgerstner@...e.de>, 2018-07-02, 14:21:
>I think the easiest way to fix this is to normalize the user supplied
>filename e.g. using realpath()
Using realpath(3) for access control is almost always a mistake: this
function expands symlinks, including attacker-controlled symlinks.
You patch uses g_file_get_path(), which AFIACT doesn't use any
filesystem I/O for canonicalisation, so that should be fine.
--
Jakub Wilk
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
