Full Disclosure mailing list archives
Re: Symlink vulnerabilities
From: Valdis.Kletnieks () vt edu
Date: Sat, 22 Oct 2011 01:51:39 -0400
On Sat, 22 Oct 2011 01:23:34 EDT, Byron Sonne said:
If you are in charge of a distro, it would not hurt to nuke it altogether and change all packages in your control to use per-user $TMPDIR. Some third-party stuff will break - but it breaks every now and then anyway.Excellent suggestion, and you've piqued my curiosity. What distros exist that implement tmp dirs in such a way? I haven't come across any, and the more I think about it, the more I wish that this is something I would see.
Fedora's had the pam_namespace stuff for a while now - it got added about the same time as SELinux. It's also in RHEL 5 and later. It also appears to be in current Ubuntu and SLES 11.1. So it's a good question of what distros *don't* have the tools to implement this? Why they don't do it by default? Because if you screw up the config, things break in strange and mysterious ways. Those of you old enough to remember the first 2-3 years of "/etc/shadow is a separate file from /etc/passwd", or even further back to when the Sun-3 created "Not all the world's a Vax", know why distros aren't enabling it by default yet. But in 2-3 years, probably...
If you had your way, would you see it implemented as /tmp/<USER> /<USER>/tmp, or some other way?
It should be site-configurable - some places may have a large fast /tmp area and they want a per-user directory on that disk space. Other places may want to have /tmp redirected to /home/${USER}/tmp so disk quotas apply, etc etc.
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Current thread:
- Symlink vulnerabilities bugs (Oct 21)
- Re: Symlink vulnerabilities Valdis . Kletnieks (Oct 21)
- Re: Symlink vulnerabilities Michal Zalewski (Oct 21)
- Re: Symlink vulnerabilities Byron Sonne (Oct 21)
- Re: Symlink vulnerabilities Valdis . Kletnieks (Oct 21)
- Re: Symlink vulnerabilities Raj Mathur (राज माथुर) (Oct 21)
- Re: Symlink vulnerabilities James Condron (Oct 22)
- Re: Symlink vulnerabilities Michal Zalewski (Oct 22)
- Re: Symlink vulnerabilities Michal Zalewski (Oct 21)
- Re: Symlink vulnerabilities Valdis . Kletnieks (Oct 21)
- Re: Symlink vulnerabilities dave bl (Oct 21)
- Re: Symlink vulnerabilities bugs (Oct 22)
- Re: Symlink vulnerabilities Leon Kaiser (Oct 24)
- Re: Symlink vulnerabilities bugs (Oct 24)
- Re: Symlink vulnerabilities xD 0x41 (Oct 25)