Re: Mac symlink attack techniques?

On Fri, Apr 11, 2008 at 3:52 AM, Jon Hart <jhart@xxxxxxxxxxx> wrote:
I'm curious if anyone has some input on this. I am in a situation where
I am able to perform a symlink attack against a process that runs as
root on a Mac. The catch is that I can create files that don't exist
and get them be created mode 666 for world writable goodness, but if the
symlink points to a file that already exists all I can do is clobber its
content with garbage.

Clearly, havoc can be made by trashing important files, but I'm looking
for an elegant and quick method for privilege escalation. Is
/etc/ld.so.conf my only option?

You can create /etc/rc.installer_cleanup which typically doesn't
usually exist, but if it does is run by init to complete software
installs after reboot.
If you are able to also force a reboot (or even count on one occurring
at a certain time), it's pretty much game over.

PaulM

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