Re: [Full-disclosure] Symlink vulnerabilities



Hi,

I've gotten this exploit to work, albeit on a slow 500mhz system with
256mb of ram. I've shared the details with vladz and will make them
available soon. It's a hard race to win, but it can be won about 60% of
the time.

On Fri, 28 Oct 2011 00:56:35 +1100, xD 0x41 said:

morning but, i trust you, itcannot be exploited, in any way, it will
only cause corruption of tar and compression utils, at most.

Umm. Maybe in *that step* it's "at most". But what can you leverage
that into?

If you can screw with the code execution of the tar command
enough to get root to untar a file of your choosing, you then have your
entire rootkit installed with no further effort on your part. ;)

(For a wonderful read on leveraging, find the tech writeup from a few
years
ago on how a 1-byte overlay in ntpd got leveraged into a total root pwn.)
_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/


_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/