Re: RedHat 7.0 (and SuSE): modutils + netkit = root compromise. (fwd)

[Michal Zalewski <lcamtuf () DIONE IDS PL>]

On Mon, 13 Nov 2000, Keith Owens wrote:

> The invoking program does not have to be setuid.  It has to pass its
> parameters directly into the kernel, the kernel must be compiled with
> kmod and kmod must pass the parameter directly to modprobe.

net/core/dev.c, line 348:

#ifdef CONFIG_KMOD

void dev_load(const char *name)
{
        if(!dev_get(name) && capable(CAP_SYS_MODULE))
                request_module(name);
}

/* ...snip... */

It has to run on privledged level (or have CAP_SYS_MODULE).

> This time you cannot blame on Redhat, the modprobe bug has been there
> for quite a while.

RedHat (and some other vendors) have not audited recently introduced
code. That's all I can say. Of course it's modutils bug.

_______________________________________________________
Michal Zalewski [lcamtuf () tpi pl] [tp.internet/security]
[http://lcamtuf.na.export.pl] <=--=> bash$ :(){ :|:&};:
=-----=> God is real, unless declared integer. <=-----=