Re: Solaris patchadd(1) (3) symlink vulnerabilty

[Paul Szabo <psz () MATHS USYD EDU AU>]

Juergen P. Meier <jpm () class de> wrote:

> Solaris /usr/sbin/patchadd is a /bin/ksh script.
> The problem lies in the vulnerability of ksh.

Damn: thus it would seem that not only sh, but also ksh is vulnerable!

> However: Sun Microsystems does recommend to only install
> patches at single-user mode (runlevel S). ...
> ... if you follow the Vendors recommendations, you are
> not vulnerable.

The attacker can create the symlinks before you go single-user. As the
original poster Jonathan Fortin <jfortin () REVELEX COM> said:

> Only solution is to rm -rf /tmp/* /tmp/.* [and] make sure no users are on

Paul Szabo - psz () maths usyd edu au  http://www.maths.usyd.edu.au:8000/u/psz/
School of Mathematics and Statistics  University of Sydney   2006  Australia