Messages in this thread | | | Date | Mon, 24 Nov 2003 13:13:42 -0500 (EST) | From | "Richard B. Johnson" <> | Subject | Re: hard links create local DoS vulnerability and security problems |
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On Mon, 24 Nov 2003 splite@purdue.edu wrote:
> On Mon, Nov 24, 2003 at 06:57:41PM +0100, Jakob Lell wrote: > > [...] > > Setuid-root binaries also work in a home directory. > > You can try it by doing this test: > > ln /bin/ping $HOME/ping > > $HOME/ping localhost > > [...] > > That's why you don't put user-writable directories on the root or /usr > partitions. (For extra points, mount your /tmp and /var/tmp partitions > nodev,nosuid.) Seriously guys, this is Unix Admin 101, not a major new > security problem. >
And if the inode that was referenced in the root-owned directory was deleted, it would no longer function as setuid root.
Cheers, Dick Johnson Penguin : Linux version 2.4.22 on an i686 machine (797.90 BogoMips). Note 96.31% of all statistics are fiction.
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