local nmap = require "nmap"
local shortport = require "shortport"
local sslcert = require "sslcert"
local string = require "string"
local vulns = require "vulns"
local http = require "http"

description = [[
    CVE-2019-19781

    A vulnerability  has been identified in Citrix Application Delivery Controller (ADC) formerly known as NetScaler ADC and Citrix Gateway formerly known as NetScaler Gateway that, 
    if exploited, could allow an unauthenticated attacker to perform arbitrary code execution.

    The vulnerability has been assigned the following CVE number:

        • CVE-2019-19781 : Vulnerability in Citrix Application Delivery Controller and Citrix Gateway leading to arbitrary code execution
        
        The vulnerability affects all supported product versions and all supported platforms:
        
        • Citrix ADC and Citrix Gateway version 13.0 all supported builds
        
        • Citrix ADC and NetScaler Gateway version 12.1 all supported builds
        
        • Citrix ADC and NetScaler Gateway version 12.0 all supported builds
        
        • Citrix ADC and NetScaler Gateway version 11.1 all supported builds
        
        • Citrix NetScaler ADC and NetScaler Gateway version 10.5 all supported builds

]]


author = "Hossam Mohamed @cyberstruggle"

license = "Same as Nmap--See https://nmap.org/book/man-legal.html"

categories = { "default", "safe", "discovery" }
dependencies = {"https-redirect"}

portrule = function(host, port)
  return shortport.ssl(host, port) or sslcert.isPortSupported(port) or sslcert.getPrepareTLSWithoutReconnect(port)
end

action = function(host, port)
    local vuln_status, err
    local vuln = {
        title = "Remote Code Execution vulnerability in Citrix Application Delivery Controller (ADC)",
        IDS = {CVE = 'CVE-2019-19781'},
        risk_factor = "HIGH",
        description = [[
            A critical remote code execution vulnerability exists in Citrix Application Delivery Controller (ADC) CVE-2019-19781.
        ]],
        references = {
        'https://support.citrix.com/article/CTX267027'
        },
        dates = {
        disclosure = {year = '2019', month = '12', day = '17'},
        }
    }
    local report = vulns.Report:new(SCRIPT_NAME, host, port)
    vuln.state = vulns.STATE.NOT_VULN

    local httpresponse1 = http.get(host, port, "/vpn/../vpns/cfg/smb.conf", nil)
    if httpresponse1.status == 200 and string.match(httpresponse1.body, "[global]") and string.match(httpresponse1.body,"lmhosts") then
        vuln.state = vulns.STATE.VULN        
    end
    return report:make_output(vuln)

end