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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