Bugtraq mailing list archives
Re: IRIX 5.3 /var/rfindd/fsdump - exploit
From: lglaze () MC2-CSR COM (Larry Glaze)
Date: Tue, 25 Feb 1997 11:30:31 -0500
At 06:33 AM 2/25/97 -0800, Chris Sheldon wrote:
Ok. Well, yet another IRIX 5.3 root exploit.
Of course, the major problem here is that IRIX allow users to
give away ownership of files. Without that, this could only
be used for changing the permissions on file so that you could read
and modify.
exploit stuff deleted....
This can be used to access pretty much any file on the system
which is currently group owned...
fun, fun, fun until SGI takes the bugs away... ;-) (right)
Ummm, why don't you just remove the file giveaway priviledge? pandora 2# systune -i Updates will be made to running system and /unix.install systune-> restricted_chown 1 restricted_chown = 1 (0x1) Do you really want to change restricted_chown to 1 (0x1)? (y/n) y In order for the change in parameter restricted_chown to become effective, reboot the system systune->q pandora 3# /etc/reboot Takes less than 5 minutes of time and gets rid of file giveaways and the above security hole. BTW, this is especially important if you are running quotas since people can 'give' their files away to root (who usually doesn't have a quota) to bypass the quota limit, yet retain ownership of the directory the files reside in, thus giving them the ability to still modify the files. Larry System/Network Administrator MC2 Cyberspace -- --------------------------------------------------------------------------- |<color><param>0000,0000,8080</param>Larry Glaze </color>|<color><param>0000,0000,8080</param> "...Life's a bummer..." </color>| |<color><param>0000,0000,8080</param>System/Network Administrator </color>|<color><param>0000,0000,8080</param> --Smashing Pumpkins </color>| |<color><param>0000,0000,8080</param>MC<smaller>2</smaller> Cyberspace, Ltd </color>|<color><param>0000,0000,8080</param> </color>| |<color><param>0000,0000,8080</param>http://www.mc2-csr.com/~lglaze </color>|<color><param>0000,0000,8080</param> lglaze () mc2-csr com </color>| --------------------------------------------------------------------------- | <color><param>ffff,0000,0000</param>All opinions are my own, as they should be! </color>| ---------------------------------------------------------------------------
Current thread:
- Re: IRIX 5.3 /var/rfindd/fsdump - exploit Larry Glaze (Feb 25)