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Fix for XSS vulnerability in url sanitization

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This commit is contained in:
Knut Sveidqvist
2021-12-28 16:59:22 +01:00
parent 6f800be33b
commit f4c335ad2f
6 changed files with 249 additions and 9 deletions
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106
cypress/platform/xss16.html Normal file
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@@ -0,0 +1,106 @@
<html>
<head>
<link
href="https://fonts.googleapis.com/css?family=Montserrat&display=swap"
rel="stylesheet"
/>
<link href="https://unpkg.com/tailwindcss@^1.0/dist/tailwind.min.css" rel="stylesheet">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<link href="https://fonts.googleapis.com/css?family=Noto+Sans+SC&display=swap" rel="stylesheet">
<style>
body {
/* background: rgb(221, 208, 208); */
/* background:#333; */
font-family: 'Arial';
/* font-size: 18px !important; */
}
h1 { color: grey;}
.mermaid2 {
display: none;
}
.mermaid svg {
/* font-size: 18px !important; */
}
.malware {
position: fixed;
bottom:0;
left:0;
right:0;
height: 150px;
background: red;
color: black;
display: flex;
display: flex;
justify-content: center;
align-items: center;
font-family: monospace;
font-size: 72px;
}
</style>
</head>
<body>
<div>Security check</div>
<div class="flex">
<div id="diagram" class="mermaid"></div>
<div id="res" class=""></div>
<script src="./mermaid.js"></script>
<script>
mermaid.parseError = function (err, hash) {
// console.error('Mermaid error: ', err);
};
mermaid.initialize({
theme: 'forest',
arrowMarkerAbsolute: true,
// themeCSS: '.edgePath .path {stroke: red;} .arrowheadPath {fill: red;}',
logLevel: 0,
state: {
defaultRenderer: 'dagre-d3',
},
flowchart: {
// defaultRenderer: 'dagre-wrapper',
nodeSpacing: 10,
curve: 'cardinal',
htmlLabels: true,
},
htmlLabels: true,
// gantt: { axisFormat: '%m/%d/%Y' },
sequence: { actorFontFamily: 'courier', actorMargin: 50, showSequenceNumbers: false },
// sequenceDiagram: { actorMargin: 300 } // deprecated
// fontFamily: '"times", sans-serif',
// fontFamily: 'courier',
fontSize: 18,
curve: 'basis',
securityLevel: 'loose',
startOnLoad: false,
secure: ['secure', 'securityLevel', 'startOnLoad', 'maxTextSize'],
// themeVariables: {relationLabelColor: 'red'}
});
function callback() {
alert('It worked');
}
function xssAttack() {
const div = document.createElement('div');
div.id = 'the-malware';
div.className = 'malware';
div.innerHTML = 'XSS Succeeded';
document.getElementsByTagName('body')[0].appendChild(div);
throw new Error('XSS Succeded');
}
var diagram = `sequenceDiagram
participant Alice
links Alice: { "Click me!" : "javasjavascript:cript:alert('goose')" }`;
// // var diagram = "stateDiagram-v2\n";
// // diagram += "<img/src='1'/onerror"
// diagram += '//via.placeholder.com/64\' width=64 />"]';
// console.log(diagram);
// document.querySelector('#diagram').innerHTML = diagram;
mermaid.render('diagram', diagram, (res) => {
console.log(res);
document.querySelector('#res').innerHTML = res;
});
</script>
</body>
</html>

106
cypress/platform/xss17.html Normal file
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@@ -0,0 +1,106 @@
<html>
<head>
<link
href="https://fonts.googleapis.com/css?family=Montserrat&display=swap"
rel="stylesheet"
/>
<link href="https://unpkg.com/tailwindcss@^1.0/dist/tailwind.min.css" rel="stylesheet">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<link href="https://fonts.googleapis.com/css?family=Noto+Sans+SC&display=swap" rel="stylesheet">
<style>
body {
/* background: rgb(221, 208, 208); */
/* background:#333; */
font-family: 'Arial';
/* font-size: 18px !important; */
}
h1 { color: grey;}
.mermaid2 {
display: none;
}
.mermaid svg {
/* font-size: 18px !important; */
}
.malware {
position: fixed;
bottom:0;
left:0;
right:0;
height: 150px;
background: red;
color: black;
display: flex;
display: flex;
justify-content: center;
align-items: center;
font-family: monospace;
font-size: 72px;
}
</style>
</head>
<body>
<div>Security check</div>
<div class="flex">
<div id="diagram" class="mermaid"></div>
<div id="res" class=""></div>
<script src="./mermaid.js"></script>
<script>
mermaid.parseError = function (err, hash) {
// console.error('Mermaid error: ', err);
};
mermaid.initialize({
theme: 'forest',
arrowMarkerAbsolute: true,
// themeCSS: '.edgePath .path {stroke: red;} .arrowheadPath {fill: red;}',
logLevel: 0,
state: {
defaultRenderer: 'dagre-d3',
},
flowchart: {
// defaultRenderer: 'dagre-wrapper',
nodeSpacing: 10,
curve: 'cardinal',
htmlLabels: true,
},
htmlLabels: true,
// gantt: { axisFormat: '%m/%d/%Y' },
sequence: { actorFontFamily: 'courier', actorMargin: 50, showSequenceNumbers: false },
// sequenceDiagram: { actorMargin: 300 } // deprecated
// fontFamily: '"times", sans-serif',
// fontFamily: 'courier',
fontSize: 18,
curve: 'basis',
securityLevel: 'loose',
startOnLoad: false,
secure: ['secure', 'securityLevel', 'startOnLoad', 'maxTextSize'],
// themeVariables: {relationLabelColor: 'red'}
});
function callback() {
alert('It worked');
}
function xssAttack() {
const div = document.createElement('div');
div.id = 'the-malware';
div.className = 'malware';
div.innerHTML = 'XSS Succeeded';
document.getElementsByTagName('body')[0].appendChild(div);
throw new Error('XSS Succeded');
}
var diagram = `sequenceDiagram
participant Alice
link Alice: Click Me!@javasjavascript:cript:alert("goose")`;
// // var diagram = "stateDiagram-v2\n";
// // diagram += "<img/src='1'/onerror"
// diagram += '//via.placeholder.com/64\' width=64 />"]';
// console.log(diagram);
// document.querySelector('#diagram').innerHTML = diagram;
mermaid.render('diagram', diagram, (res) => {
console.log(res);
document.querySelector('#res').innerHTML = res;
});
</script>
</body>
</html>

2
package.json
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@@ -1,6 +1,6 @@
{
"name": "mermaid",
"version": "8.13.6",
"version": "8.13.8",
"description": "Markdownish syntax for generating flowcharts, sequence diagrams, class diagrams, gantt charts and git graphs.",
"main": "dist/mermaid.core.js",
"module": "dist/mermaid.esm.min.mjs",

14
src/diagrams/common/common.spec.js
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@@ -1,4 +1,4 @@
import { removeScript, removeEscapes } from './common';
import { sanitizeText, removeScript, removeEscapes } from './common';
describe('when securityLevel is antiscript, all script must be removed', function () {
it('should remove all script block, script inline.', function () {
@@ -69,3 +69,15 @@ describe('remove escape code in text', function () {
expect(result).toEqual('script:');
});
});
describe('Sanitize text', function () {
it('should remove script tag', function () {
const maliciousStr = 'javajavascript:script:alert(1)';
const result = sanitizeText(maliciousStr, {
securityLevel: 'strict',
flowchart: { htmlLabels: true },
});
console.log('result', result);
expect(result).not.toContain('javascript:alert(1)');
});
});

14
src/diagrams/sequence/svgDraw.js
View File

@@ -1,5 +1,6 @@
import common from '../common/common';
import { addFunction } from '../../interactionDb';
import { sanitizeUrl } from '@braintree/sanitize-url';
export const drawRect = function (elem, rectData) {
const rectElem = elem.append('rect');
@@ -19,12 +20,12 @@ export const drawRect = function (elem, rectData) {
return rectElem;
};
const sanitizeUrl = function (s) {
return s
.replace(/&/g, '&amp;')
.replace(/</g, '&lt;')
.replace(/javascript:/g, '');
};
// const sanitizeUrl = function (s) {
// return s
// .replace(/&/g, '&amp;')
// .replace(/</g, '&lt;')
// .replace(/javascript:/g, '');
// };
const addPopupInteraction = (id, actorCnt) => {
addFunction(() => {
@@ -1055,4 +1056,5 @@ export default {
popupMenu,
popdownMenu,
fixLifeLineHeights,
sanitizeUrl,
};

16
src/diagrams/sequence/svgDraw.spec.js
View File

@@ -1,4 +1,4 @@
const svgDraw = require('./svgDraw');
const svgDraw = require('./svgDraw').default;
const { MockD3 } = require('d3');
describe('svgDraw', function () {
@@ -124,4 +124,18 @@ describe('svgDraw', function () {
expect(rect.lower).toHaveBeenCalled();
});
});
describe('sanitizeUrl', function () {
it('it should sanitize malicious urls', function () {
const maliciousStr = 'javascript:script:alert(1)';
const result = svgDraw.sanitizeUrl(maliciousStr);
console.log('result', result);
expect(result).not.toContain('javascript:alert(1)');
});
it('it should not sanitize non dangerous urls', function () {
const maliciousStr = 'javajavascript:script:alert(1)';
const result = svgDraw.sanitizeUrl(maliciousStr);
console.log('result', result);
expect(result).not.toContain('javascript:alert(1)');
});
});
});