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HackTheBox/Canvas.md
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182
HackTheBox/Canvas.md
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# HackTheBox-Canvas
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Canvas is a challenge which comes under miscallenous category , the description says
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```
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We want to update our website but we are unable to because the developer who coded this left today. Can you take a look?
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```
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And we are presented with a zip archive that we can extract using the password `hackthebox`
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<img src="https://i.imgur.com/jBd7pdk.png"/>
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We get html page with css and javascript file , on opening that on browser we'll get a login page which we will have 3 tries
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<img src="https://i.imgur.com/5DftxSh.png"/>
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<img src="https://i.imgur.com/xoVrkO7.png"/>
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So let's look at the javascript file
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<img src="https://i.imgur.com/tSijurz.png"/>
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`login.js` looks like it's obfuscated so let's look for an online tool that can format this better so we can understand the javascript file easily
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<img src="https://i.imgur.com/l03dDAE.png"/>
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```javascript
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'use strict';
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var _0x4e0b = ["toString", "username", "console", "getElementById", "log", "bind", "disabled", "apply", "admin", "prototype", '{}.constructor("return this")( )', " attempt;", "value", "constructor", "You have left ", "trace", 'return /" + this + "/', "table", "length", "__proto__", "error", "Login successfully"];
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(function(data, opts) {
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var uri = function fn(selected_image) {
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for (; --selected_image;) {
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data["push"](data["shift"]());
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}
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};
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var gotoNewOfflinePage = function build() {
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var Cookies = {
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"data" : {
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"key" : "cookie",
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"value" : "timeout"
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},
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"setCookie" : function build(value, scheme, id, headers) {
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headers = headers || {};
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var cookie = scheme + "=" + id;
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var _0x3f3096 = 0;
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var j = 0;
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var len = value["length"];
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for (; j < len; j++) {
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var url = value[j];
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cookie = cookie + ("; " + url);
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var v = value[url];
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value["push"](v);
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len = value["length"];
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if (v !== !![]) {
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cookie = cookie + ("=" + v);
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}
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}
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headers["cookie"] = cookie;
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},
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"removeCookie" : function done() {
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return "dev";
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},
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"getCookie" : function getCookie(match, href) {
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match = match || function(canCreateDiscussions) {
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return canCreateDiscussions;
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};
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var v = match(new RegExp("(?:^|; )" + href["replace"](/([.$?*|{}()[]\/+^])/g, "$1") + "=([^;]*)"));
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var trim = function direct(subquest, maxRedirects) {
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subquest(++maxRedirects);
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};
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return trim(uri, opts), v ? decodeURIComponent(v[1]) : undefined;
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}
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};
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var updatedReverseItemControlData = function testcase() {
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var test = new RegExp("\\w+ *\\(\\) *{\\w+ *['|\"].+['|\"];? *}");
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return test["test"](Cookies["removeCookie"]["toString"]());
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};
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Cookies["updateCookie"] = updatedReverseItemControlData;
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var array = "";
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var _0x4ac08e = Cookies["updateCookie"]();
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if (!_0x4ac08e) {
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Cookies["setCookie"](["*"], "counter", 1);
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} else {
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if (_0x4ac08e) {
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array = Cookies["getCookie"](null, "counter");
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} else {
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Cookies["removeCookie"]();
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}
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}
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};
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gotoNewOfflinePage();
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})(_0x4e0b, 386);
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var _0x20fe = function PocketDropEvent(ballNumber, opt_target) {
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ballNumber = ballNumber - 0;
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var ball = _0x4e0b[ballNumber];
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return ball;
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};
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var _0x35c856 = function() {
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var y$$ = !![];
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return function(ch, myPreferences) {
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var voronoi = y$$ ? function() {
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var getPreferenceKey = _0x20fe;
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if (myPreferences) {
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var bytes = myPreferences[getPreferenceKey("0x11")](ch, arguments);
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return myPreferences = null, bytes;
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}
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} : function() {
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};
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return y$$ = ![], voronoi;
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};
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}();
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var _0x4ac08e = _0x35c856(undefined, function() {
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var gotoNewOfflinePage = function mountTypeScript() {
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var register = _0x20fe;
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var B713 = mountTypeScript[register("0x1")](register("0x4"))()[register("0x1")]("^([^ ]+( +[^ ]+)+)+[^ ]}");
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return !B713["test"](_0x4ac08e);
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};
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return gotoNewOfflinePage();
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});
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_0x4ac08e();
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var _0x4c641a = function() {
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var y$$ = !![];
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return function(ch, myPreferences) {
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var voronoi = y$$ ? function() {
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var getPreferenceKey = _0x20fe;
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if (myPreferences) {
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var bytes = myPreferences[getPreferenceKey("0x11")](ch, arguments);
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return myPreferences = null, bytes;
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}
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} : function() {
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};
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return y$$ = ![], voronoi;
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};
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}();
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var _0x2548ec = _0x4c641a(undefined, function() {
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var rel2Mstr = _0x20fe;
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var el;
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try {
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var render = Function("return (function() " + rel2Mstr("0x14") + ");");
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el = render();
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} catch (_0x57823f) {
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el = window;
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}
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var uids = el[rel2Mstr("0xc")] = el[rel2Mstr("0xc")] || {};
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var levels = [rel2Mstr("0xe"), "warn", "info", rel2Mstr("0x8"), "exception", rel2Mstr("0x5"), rel2Mstr("0x3")];
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var j = 0;
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for (; j < levels[rel2Mstr("0x6")]; j++) {
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var intval = _0x4c641a[rel2Mstr("0x1")][rel2Mstr("0x13")]["bind"](_0x4c641a);
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var i = levels[j];
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var same = uids[i] || intval;
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intval[rel2Mstr("0x7")] = _0x4c641a[rel2Mstr("0xf")](_0x4c641a);
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intval["toString"] = same[rel2Mstr("0xa")][rel2Mstr("0xf")](same);
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uids[i] = intval;
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}
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});
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_0x2548ec();
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var attempt = 3;
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function validate() {
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var _ = _0x20fe;
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var oldValue = document["getElementById"]("username")["value"];
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var newValue = document[_("0xd")]("password")[_("0x0")];
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if (oldValue == _("0x12") && newValue == _("0x12")) {
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return alert(_("0x9")), window["location"] = "dashboard.html", ![];
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} else {
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attempt--;
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alert(_("0x2") + attempt + _("0x15"));
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if (attempt == 0) {
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return document[_("0xd")](_("0xb"))["disabled"] = !![], document[_("0xd")]("password")[_("0x10")] = !![], document[_("0xd")]("submit")[_("0x10")] = !![], ![];
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}
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}
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}
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var res = String["fromCharCode"](72, 84, 66, 123, 87, 51, 76, 99, 48, 109, 51, 95, 55, 48, 95, 74, 52, 86, 52, 53, 67, 82, 49, 112, 55, 95, 100, 51, 48, 98, 70, 117, 53, 67, 52, 55, 49, 48, 78, 125, 10);
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```
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This gives us a very long javascript file but if we look at the end where it's converting `fromcharcode` to string and saving it into a variable , it isn't being used anywhere so we can just copy it and convert it to string using `cyberchef` with `From Decimal` conversion
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<img src="https://i.imgur.com/J488AKP.png"/>
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## References
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- https://www.dcode.fr/javascript-unobfuscator
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- https://gchq.github.io/CyberChef/
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