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Message-ID: <CAH8yC8mWjOFAPe==ceGEfe=1sGpaicMRPwzdET61D04bJFa6fA@mail.gmail.com>
Date: Wed, 7 Oct 2020 22:09:43 -0400
From: Jeffrey Walton <noloader@...il.com>
To: oss-security@...ts.openwall.com
Subject: Re: Debian FEATURE: /home/loser is with permissions
755, default umask 0022
On Wed, Oct 7, 2020 at 3:20 PM Jeremy Stanley <fungi@...goth.org> wrote:
>
> On 2020-10-07 21:00:35 +0300 (+0300), Georgi Guninski wrote:
> > https://lists.debian.org/debian-security/2020/10/msg00000.html
> >
> > ===
> > /home/loser is with permissions 755, default umask 0022
> > on multiuser machines this sucks much.
> >
>
> It's tradition that on multi-user systems, users would want to share
> data with one another and also serve content from their home
> directories in Web sites. Further, it's not at all uncommon for
> sysadmins to not understand or consider the system defaults when
> making deployment decisions and failing to secure sensitive files.
>
> As a long-time Debian user myself, I agree that this default is
> showing its age, and can represent a risk for operators who overlook
> it.
Microsoft has an elegant solution with Bypass Traverse Checking
(SeChangeNotifyPrivilege). It allows an admin to deny access to
/home/loser, but allow access to /home/loser/www. Instead of a
permission check working down the hierarchy, just the www object is
checked.
Jeff
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