Nmap Development mailing list archives
Re: [NSE Script] MySQL Server Information
From: sawall <sawall () gmail com>
Date: Tue, 18 Dec 2007 11:32:22 -0600
Great work guys. This script is awesome. The one thing I am trying to test for is a blank (or easy) password for the sa account. How hard do you think that would be to build in? I'm at a slight disadvantage as I just started trying to learn about Lua today, so it might take me a bit before I'm off and running. Thanks, chris From: jah <jah_at_zadkiel.plus.com<jah_at_zadkiel.plus.com?Subject=Re:%20%5BNSE%20Script%5D%20MySQL%20Server%20Information>> Date: Tue, 18 Dec 2007 02:26:14 +0000 On 17/12/2007 00:07, Kris Katterjohn wrote: *>> Initiating SCRIPT ENGINE at 22:20 * *>> * *>> SCRIPT ENGINE: TCP 192.168.1.1:12439 > 85.234.xxx.xxx:3306 | CONNECT * *>> SCRIPT ENGINE: TCP 192.168.1.1:12439 < 85.234.xxx.xxx:3306 | * *>> n....i.Host 'me!' is blocked because of many connection errors; * *>> unblock with 'mysqladmin flush-hosts' * *>> * *>> and it seemed to hang right after: * *>> * *>> SCRIPT ENGINE: TCP 192.168.1.1:12439 > 85.234.xxx.xxx:3306 | CLOSE * *>> * *>> It may, or may not, be worth testing for this. * *>> * *> Great script by the way. I found another thing while I was playing. * *> I found a webpage that reveals the php mysql_connect command yesterday * *> and, as if by magic, your post to nmap-dev followed shortly after so I * *> took the opportunity to see if I could mod the script and connect to * *> it with the supplied credentials. After playing for a while, running * *> your script was causing nmap to hammer my cpu and I found that I'd * *> been blocked by the mysql server and got the following response (the * *> names have been changed to protect the stupid): * *> * *> Did this error happen with my script verbatim, or only with your * *> modded version? * *> * *> I've just been reading on this, and one possibility is just the actual * *> network connection between you and the host. Another thing could be * *> my script causing this. I'm certainly no expert on the MySQL protocol * *> (or Lua as you can tell :D). * No, it seems your script was not the cause, my messing around caused it. I think "many connection errors" refers to the application layer [1] and after much testing, I found that your script is closing sockets without issue and that the issue was further into the script. Then after a bit of reading, I found that the script was breaking when the mysql server responded with an error which it does by serving 0xff instead of a protocol byte, followed by a two byte error code and then the error string [2]. It was evident that your code wasn't handling this even though I couldn't tell exactly where it broke. Doesn't really matter though... I've attached your script, slightly modified to return any mysql error details and which shouldn't cause the above described issue in these circumstances. Hopefully. While I was testing it with many many random hosts I found that, using version detection, the version always contains "unauthorized" when I get an error code 0x046A (1130 ~ "Host not allowed to connect") from the script output - quite useful cross check I thought - and, given that nmap will have already matched the mysql error, it's maybe worth testing for this straight away (if used with version detection) to avoid running the script. I've included this modded portrule too, but it's not implemented so you can have a play - I imagine the script needs a bit more testing anyway. Next step, supply the script with args for user:pwd and try to return database names... jah [1] many connection errors - http://dev.mysql.com/doc/refman/5.0/en/blocked-host.html [2] MySql Protocol - http://www.redferni.uklinux.net/mysql/MySQL-Protocol.html -- Connect to MySQL server and print information such as the protocol and -- version numbers, thread id, status, capabilities and the password salt id = "MySQL Server Information" description = "Connects to a MySQL server and prints information" author = "Kris Katterjohn <katterjohn_at_gmail.com>" license = "Look at Nmap's COPYING" categories = { "discovery", "safe" } require 'shortport' require 'bit' -- Grabs NUL-terminated string local getstring = function(orig) local str = "" local index = 1 while orig:byte(index) ~= 0 do str = str .. string.char(orig:byte(index)) index = index + 1 end return str end -- Convert two bytes into a number ntohs = function(num) local b1 = bit.band(num:byte(1), 255) local b2 = bit.band(num:byte(2), 255) return bit.bor(b1, bit.lshift(b2, 8)) end -- Convert three bytes into a number ntoh3 = function(num) local b1 = bit.band(num:byte(1), 255) local b2 = bit.band(num:byte(2), 255) local b3 = bit.band(num:byte(3), 255) return bit.bor(b1, bit.lshift(b2, 8), bit.lshift(b3, 16)) end -- Convert four bytes into a number ntohl = function(num) local b1 = bit.band(num:byte(1), 255) local b2 = bit.band(num:byte(2), 255) local b3 = bit.band(num:byte(3), 255) local b4 = bit.band(num:byte(4), 255) return bit.bor(b1, bit.lshift(b2, 8), bit.lshift(b3, 16), bit.lshift(b4, 24)) end -- Convert number to a list of capabilities for printing capabilities = function(num) local caps = "" if bit.band(num, 1) > 0 then caps = caps .. "Long Passwords, " end if bit.band(num, 8) > 0 then caps = caps .. "Connect with DB, " end if bit.band(num, 32) > 0 then caps = caps .. "Compress, " end if bit.band(num, 64) > 0 then caps = caps .. "ODBC, " end if bit.band(num, 2048) > 0 then caps = caps .. "SSL, " end if bit.band(num, 8192) > 0 then caps = caps .. "Transactions, " end if bit.band(num, 32768) > 0 then caps = caps .. "Secure Connection, " end return caps:gsub(", $", "") end portrule = shortport.port_or_service(3306, "mysql") --[[ ** If version.extrainfo contains "unauthorized" then don't run the script ** portrule = function(host, port) if (port.number == 3306 or port.service == "mysql") and port.protocol == "tcp" and port.state == "open" and not (port.version.extrainfo ~= nil and string.match( port.version.extrainfo, "unauthorized")) -- should we also test for lang en-gb "unauthoriSed"?? then return true else return false end end --]] action = function(host, port) local sock local response = "" local output = "" sock = nmap.new_socket() sock:set_timeout(5000) sock:connect(host.ip, port.number) while true do local status, line = sock:receive_lines(1) if not status then break end response = response .. line end sock:close() local length = ntoh3(response:sub(1, 3)) if length ~= response:len() - 4 then return "Invalid greeting (Not MySQL?)" end -- Keeps track of where we are in the binary data local offset = 1 + 4 local protocol = response:byte(offset) if (protocol == 255) then output = "MySQL Error detected!" -- 0xff found where protocol should be offset = offset + 1 local sqlerrno = ntohs(response:sub(offset, offset + 2)) offset = offset + 2 local sqlerrstr = response:sub(offset) output = output .. "\n" .. "Error Code was: " .. sqlerrno .. "\n" output = output .. "\n" .. sqlerrstr else offset = offset + 1 local version = getstring(response:sub(offset)) offset = offset + version:len() + 1 local threadid = ntohl(response:sub(offset, offset + 4)) offset = offset + 4 local salt = getstring(response:sub(offset)) offset = offset + salt:len() + 1 local caps = capabilities(ntohs(response:sub(offset, offset + 2))) offset = offset + 2 offset = offset + 1 local status = "" if ntohs(response:sub(offset, offset + 2)) == 2 then status = "Autocommit" end offset = offset + 2 offset = offset + 13 -- unused if response:len() - offset + 1 == 13 then salt = salt .. getstring(response:sub(offset)) end output = output .. "Protocol: " .. protocol .. "\n" output = output .. "Version: " .. version .. "\n" output = output .. "Thread ID: " .. threadid .. "\n" if caps:len() > 0 then output = output .. "Some Capabilities: " .. caps .. "\n" end if status:len() > 0 then output = output .. "Status: " .. status .. "\n" end output = output .. "Salt: " .. salt .. "\n" end return output end _______________________________________________ Sent through the nmap-dev mailing list http://cgi.insecure.org/mailman/listinfo/nmap-dev Archived at http://SecLists.Org
Current thread:
- Re: [NSE Script] MySQL Server Information, (continued)
- Re: [NSE Script] MySQL Server Information Brandon Enright (Dec 18)
- Re: [NSE Script] MySQL Server Information sawall (Dec 18)
- Re: [NSE Script] MySQL Server Information Kris Katterjohn (Dec 18)
- Re: [NSE Script] MySQL Server Information jah (Dec 18)
- Re: [NSE Script] MySQL Server Information Kris Katterjohn (Dec 18)
- Re: [NSE Script] MySQL Server Information Fyodor (Dec 18)
- RE: [NSE Script] MySQL Server Information Rob Nicholls (Dec 18)
- Re: [NSE Script] MySQL Server Information jah (Dec 18)
- Re: [NSE Script] MySQL Server Information Fyodor (Dec 18)
- Re: [NSE Script] MySQL Server Information jah (Dec 18)
- RE: [NSE Script] MySQL Server Information Rob Nicholls (Dec 18)
- Re: [NSE Script] MySQL Server Information Thomas Buchanan (Dec 18)
- Re: [NSE Script] MySQL Server Information sawall (Dec 18)
- Re: [NSE Script] MySQL Server Information Fyodor (Dec 18)