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erik-krogherik-krogh
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add a markdown step through the mermaid library
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‎javascript/ql/lib/change-notes/2022-08-09-mermaid.md

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---
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category: minorAnalysis
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---
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* A model for the `mermaid` library has been added. XSS queries can now detect flow through the `render` method of the `mermaid` library.

‎javascript/ql/lib/semmle/javascript/frameworks/Markdown.qll

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@@ -78,6 +78,32 @@ module Markdown {
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}
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}
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/** A taint step for the `mermaid` library. */
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private class MermaidStep extends MarkdownStep {
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override predicate step(DataFlow::Node pred, DataFlow::Node succ) {
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exists(API::CallNode call |
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call =
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[API::moduleImport("mermaid"), API::moduleImport("mermaid").getMember("mermaidAPI")]
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.getMember("render")
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.getACall()
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|
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succ = [call, call.getParameter(2).getParameter(0).asSource()] and
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pred = call.getArgument(1)
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)
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or
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exists(DataFlow::CallNode call |
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call =
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[
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DataFlow::globalVarRef("mermaid"),
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DataFlow::globalVarRef("mermaid").getAPropertyRead("mermaidAPI")
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].getAMemberCall("render")
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|
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succ = [call.(DataFlow::Node), call.getABoundCallbackParameter(2, 0)] and
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pred = call.getArgument(1)
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)
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}
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}
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/**
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* Classes and predicates for modeling taint steps in `unified` and `remark`.
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*/

‎javascript/ql/test/query-tests/Security/CWE-079/UnsafeHtmlConstruction/UnsafeHtmlConstruction.expected

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| main.js:93:43:93:43 | x |
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| main.js:94:31:94:31 | x |
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| main.js:98:43:98:43 | x |
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| main.js:98:43:98:43 | x |
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| main.js:99:28:99:28 | x |
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| main.js:103:43:103:43 | x |
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| main.js:103:43:103:43 | x |
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| main.js:105:26:105:26 | x |
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| main.js:109:41:109:41 | x |
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| main.js:111:37:111:37 | x |
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| main.js:111:37:111:37 | x |
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| main.js:116:47:116:47 | s |
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| main.js:116:47:116:47 | s |
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| main.js:117:34:117:34 | s |
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| main.js:117:34:117:34 | s |
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| typed.ts:1:39:1:39 | s |
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| typed.ts:1:39:1:39 | s |
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| typed.ts:2:29:2:29 | s |
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| main.js:93:43:93:43 | x | main.js:94:31:94:31 | x |
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| main.js:93:43:93:43 | x | main.js:94:31:94:31 | x |
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| main.js:94:31:94:31 | x | main.js:89:21:89:21 | x |
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| main.js:98:43:98:43 | x | main.js:99:28:99:28 | x |
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| main.js:98:43:98:43 | x | main.js:99:28:99:28 | x |
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| main.js:98:43:98:43 | x | main.js:99:28:99:28 | x |
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| main.js:98:43:98:43 | x | main.js:99:28:99:28 | x |
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| main.js:98:43:98:43 | x | main.js:103:43:103:43 | x |
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| main.js:98:43:98:43 | x | main.js:103:43:103:43 | x |
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| main.js:98:43:98:43 | x | main.js:103:43:103:43 | x |
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| main.js:98:43:98:43 | x | main.js:103:43:103:43 | x |
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| main.js:98:43:98:43 | x | main.js:105:26:105:26 | x |
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| main.js:98:43:98:43 | x | main.js:105:26:105:26 | x |
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| main.js:98:43:98:43 | x | main.js:105:26:105:26 | x |
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| main.js:98:43:98:43 | x | main.js:105:26:105:26 | x |
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| main.js:98:43:98:43 | x | main.js:109:41:109:41 | x |
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| main.js:98:43:98:43 | x | main.js:109:41:109:41 | x |
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| main.js:98:43:98:43 | x | main.js:109:41:109:41 | x |
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| main.js:98:43:98:43 | x | main.js:109:41:109:41 | x |
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| main.js:98:43:98:43 | x | main.js:111:37:111:37 | x |
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| main.js:98:43:98:43 | x | main.js:111:37:111:37 | x |
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| main.js:98:43:98:43 | x | main.js:111:37:111:37 | x |
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| main.js:98:43:98:43 | x | main.js:111:37:111:37 | x |
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| main.js:116:47:116:47 | s | main.js:117:34:117:34 | s |
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| main.js:116:47:116:47 | s | main.js:117:34:117:34 | s |
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| main.js:116:47:116:47 | s | main.js:117:34:117:34 | s |
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@@ -153,5 +193,11 @@ edges
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| main.js:67:63:67:69 | attrVal | main.js:66:35:66:41 | attrVal | main.js:67:63:67:69 | attrVal | $@ based on $@ might later cause $@. | main.js:67:63:67:69 | attrVal | HTML construction | main.js:66:35:66:41 | attrVal | library input | main.js:67:47:67:78 | "<img a ... "\\"/>" | cross-site scripting |
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| main.js:81:35:81:37 | val | main.js:79:34:79:36 | val | main.js:81:35:81:37 | val | $@ based on $@ might later cause $@. | main.js:81:35:81:37 | val | HTML construction | main.js:79:34:79:36 | val | library input | main.js:81:24:81:49 | "<span> ... /span>" | cross-site scripting |
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| main.js:90:23:90:23 | x | main.js:93:43:93:43 | x | main.js:90:23:90:23 | x | $@ based on $@ might later cause $@. | main.js:90:23:90:23 | x | HTML construction | main.js:93:43:93:43 | x | library input | main.js:94:20:94:32 | createHTML(x) | cross-site scripting |
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| main.js:99:28:99:28 | x | main.js:98:43:98:43 | x | main.js:99:28:99:28 | x | $@ based on $@ might later cause $@. | main.js:99:28:99:28 | x | Markdown rendering | main.js:98:43:98:43 | x | library input | main.js:100:24:100:26 | svg | cross-site scripting |
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| main.js:103:43:103:43 | x | main.js:98:43:98:43 | x | main.js:103:43:103:43 | x | $@ based on $@ might later cause $@. | main.js:103:43:103:43 | x | Markdown rendering | main.js:98:43:98:43 | x | library input | main.js:103:20:103:44 | myMerma ... id", x) | cross-site scripting |
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| main.js:105:26:105:26 | x | main.js:98:43:98:43 | x | main.js:105:26:105:26 | x | $@ based on $@ might later cause $@. | main.js:105:26:105:26 | x | Markdown rendering | main.js:98:43:98:43 | x | library input | main.js:106:24:106:26 | svg | cross-site scripting |
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| main.js:109:41:109:41 | x | main.js:98:43:98:43 | x | main.js:109:41:109:41 | x | $@ based on $@ might later cause $@. | main.js:109:41:109:41 | x | Markdown rendering | main.js:98:43:98:43 | x | library input | main.js:109:20:109:42 | mermaid ... id", x) | cross-site scripting |
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| main.js:111:37:111:37 | x | main.js:98:43:98:43 | x | main.js:111:37:111:37 | x | $@ based on $@ might later cause $@. | main.js:111:37:111:37 | x | Markdown rendering | main.js:98:43:98:43 | x | library input | main.js:112:24:112:26 | svg | cross-site scripting |
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| main.js:117:34:117:34 | s | main.js:116:47:116:47 | s | main.js:117:34:117:34 | s | $@ based on $@ might later cause $@. | main.js:117:34:117:34 | s | Markdown rendering | main.js:116:47:116:47 | s | library input | main.js:118:53:118:56 | html | cross-site scripting |
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| typed.ts:2:29:2:29 | s | typed.ts:1:39:1:39 | s | typed.ts:2:29:2:29 | s | $@ based on $@ might later cause $@. | typed.ts:2:29:2:29 | s | HTML construction | typed.ts:1:39:1:39 | s | library input | typed.ts:3:31:3:34 | html | cross-site scripting |
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| typed.ts:8:40:8:40 | s | typed.ts:6:43:6:43 | s | typed.ts:8:40:8:40 | s | $@ based on $@ might later cause $@. | typed.ts:8:40:8:40 | s | HTML construction | typed.ts:6:43:6:43 | s | library input | typed.ts:8:29:8:52 | "<span> ... /span>" | cross-site scripting |

‎javascript/ql/test/query-tests/Security/CWE-079/UnsafeHtmlConstruction/main.js

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module.exports.usesCreateHTML = function (x) {
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$("#foo").html(createHTML(x));
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}
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}
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const myMermaid = require('mermaid');
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module.exports.usesCreateHTML = function (x) {
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myMermaid.render("id", x, function (svg) { // NOT OK
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$("#foo").html(svg);
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});
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$("#foo").html(myMermaid.render("id", x)); // NOT OK
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mermaid.render("id", x, function (svg) {// NOT OK
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$("#foo").html(svg);
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});
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$("#foo").html(mermaid.render("id", x)); // NOT OK
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mermaid.mermaidAPI.render("id", x, function (svg) {// NOT OK
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$("#foo").html(svg);
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});
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}
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module.exports.xssThroughMarkdown = function (s) {
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const html = markdown.render(s); // NOT OK
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document.querySelector("#markdown").innerHTML = html;
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}

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