bugtraq - Re: Re: hard links on Linux create local DoS vulnerability and security problems

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Wed, 26 Nov 2003 14:18:56 -0800
From: Jeremiah Cornelius <jeremiah@....net>
To: Jakob Lell <jlell@...obLell.de>
Cc: Steven Leikeim <steven@...l.ucalgary.ca>, full-disclosure@...ts.netsys.com,
   bugtraq@...urityfocus.com
Subject: Re: Re: hard links on Linux create local DoS vulnerability and security problems


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Monday 24 November 2003 10:17, Steven Leikeim wrote:
<SNIP>
> There is a simpler solution. Place user files on a separate filesystem
> from system files. This includes putting all temporary files on separate
> filesystems of their own. (Both /tmp and /var/tmp.) Since hard links
> cannot cross filesystems the problem disappears. Mounting user filesystems
> nosuid and nodev will prevent security problems should a setuid binary
> appear in that filesystem.

And a mandatory system profile in /etc , which aliases ln as 'ln -s' might 
help.  One for each valid shell.

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.3 (GNU/Linux)

iD8DBQE/xSbQJi2cv3XsiSARAm5CAJwPkETRJxLWAXw3M+B8jjfUwr38aQCeNzU/
4AjEdIIdmXmIHA6pYWjb1ao=
=FIsi
-----END PGP SIGNATURE-----

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.netsys.com/full-disclosure-charter.html