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Merge pull request github#6311 from asgerf/js/dom-element-methods
Approved by erik-krogh
2 parents 6a09a56 + 1b67b43 commit 4750327

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‎javascript/change-notes/2021-07-16-dom-element-methods.md

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lgtm,codescanning
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* Some methods from the DOM API are now modeled more precisely, potentially
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leading to more `js/xss` results.

‎javascript/ql/src/semmle/javascript/DOM.qll

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@@ -291,10 +291,33 @@ module DOM {
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*/
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abstract class Range extends DataFlow::Node { }
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private predicate isDomElementType(ExternalType type) { isDomRootType(type.getASupertype*()) }
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private string getADomPropertyName() {
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exists(ExternalInstanceMemberDecl decl |
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result = decl.getName() and
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isDomRootType(decl.getDeclaringType().getASupertype*())
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isDomElementType(decl.getDeclaringType())
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)
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}
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private predicate isDomElementTypeName(string name) {
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exists(ExternalType type |
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isDomElementType(type) and
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name = type.getName()
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)
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}
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/** Gets a method name which, if invoked on a DOM element (possibly of a specific subtype), returns a DOM element. */
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private string getAMethodProducingDomElements() {
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exists(ExternalInstanceMemberDecl decl |
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result = decl.getName() and
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isDomElementType(decl.getDeclaringType()) and
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isDomElementTypeName(decl.getDocumentation()
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.getATagByTitle("return")
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.getType()
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.getAnUnderlyingType()
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.(JSDocNamedTypeExpr)
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.getName())
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)
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}
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@@ -339,6 +362,8 @@ module DOM {
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or
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this = domElementCollection()
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or
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this = domValueRef().getAMethodCall(getAMethodProducingDomElements())
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or
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this = forms()
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or
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// reading property `foo` - where a child has `name="foo"` - resolves to that child.

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

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| tst.js:456:18:456:42 | ansiToH ... source) |
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| tst.js:456:18:456:42 | ansiToH ... source) |
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| tst.js:456:36:456:41 | source |
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| tst.js:460:6:460:38 | source |
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| tst.js:460:15:460:38 | documen ... .search |
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| tst.js:460:15:460:38 | documen ... .search |
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| tst.js:463:21:463:26 | source |
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| tst.js:463:21:463:26 | source |
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| tst.js:465:19:465:24 | source |
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| tst.js:465:19:465:24 | source |
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| tst.js:467:20:467:25 | source |
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| tst.js:467:20:467:25 | source |
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| typeahead.js:20:13:20:45 | target |
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| typeahead.js:20:22:20:45 | documen ... .search |
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| typeahead.js:20:22:20:45 | documen ... .search |
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| tst.js:453:16:453:39 | documen ... .search | tst.js:453:7:453:39 | source |
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| tst.js:456:36:456:41 | source | tst.js:456:18:456:42 | ansiToH ... source) |
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| tst.js:456:36:456:41 | source | tst.js:456:18:456:42 | ansiToH ... source) |
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| tst.js:460:6:460:38 | source | tst.js:463:21:463:26 | source |
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| tst.js:460:6:460:38 | source | tst.js:463:21:463:26 | source |
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| tst.js:460:6:460:38 | source | tst.js:465:19:465:24 | source |
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| tst.js:460:6:460:38 | source | tst.js:465:19:465:24 | source |
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| tst.js:460:6:460:38 | source | tst.js:467:20:467:25 | source |
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| tst.js:460:6:460:38 | source | tst.js:467:20:467:25 | source |
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| tst.js:460:15:460:38 | documen ... .search | tst.js:460:6:460:38 | source |
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| tst.js:460:15:460:38 | documen ... .search | tst.js:460:6:460:38 | source |
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| typeahead.js:20:13:20:45 | target | typeahead.js:21:12:21:17 | target |
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| typeahead.js:20:22:20:45 | documen ... .search | typeahead.js:20:13:20:45 | target |
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| typeahead.js:20:22:20:45 | documen ... .search | typeahead.js:20:13:20:45 | target |
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| tst.js:445:32:445:37 | source | tst.js:436:15:436:38 | documen ... .search | tst.js:445:32:445:37 | source | Cross-site scripting vulnerability due to $@. | tst.js:436:15:436:38 | documen ... .search | user-provided value |
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| tst.js:455:18:455:23 | source | tst.js:453:16:453:39 | documen ... .search | tst.js:455:18:455:23 | source | Cross-site scripting vulnerability due to $@. | tst.js:453:16:453:39 | documen ... .search | user-provided value |
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| tst.js:456:18:456:42 | ansiToH ... source) | tst.js:453:16:453:39 | documen ... .search | tst.js:456:18:456:42 | ansiToH ... source) | Cross-site scripting vulnerability due to $@. | tst.js:453:16:453:39 | documen ... .search | user-provided value |
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| tst.js:463:21:463:26 | source | tst.js:460:15:460:38 | documen ... .search | tst.js:463:21:463:26 | source | Cross-site scripting vulnerability due to $@. | tst.js:460:15:460:38 | documen ... .search | user-provided value |
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| tst.js:465:19:465:24 | source | tst.js:460:15:460:38 | documen ... .search | tst.js:465:19:465:24 | source | Cross-site scripting vulnerability due to $@. | tst.js:460:15:460:38 | documen ... .search | user-provided value |
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| tst.js:467:20:467:25 | source | tst.js:460:15:460:38 | documen ... .search | tst.js:467:20:467:25 | source | Cross-site scripting vulnerability due to $@. | tst.js:460:15:460:38 | documen ... .search | user-provided value |
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| typeahead.js:25:18:25:20 | val | typeahead.js:20:22:20:45 | documen ... .search | typeahead.js:25:18:25:20 | val | Cross-site scripting vulnerability due to $@. | typeahead.js:20:22:20:45 | documen ... .search | user-provided value |
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| v-html.vue:2:8:2:23 | v-html=tainted | v-html.vue:6:42:6:58 | document.location | v-html.vue:2:8:2:23 | v-html=tainted | Cross-site scripting vulnerability due to $@. | v-html.vue:6:42:6:58 | document.location | user-provided value |
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| various-concat-obfuscations.js:4:4:4:31 | "<div>" ... </div>" | various-concat-obfuscations.js:2:16:2:39 | documen ... .search | various-concat-obfuscations.js:4:4:4:31 | "<div>" ... </div>" | Cross-site scripting vulnerability due to $@. | various-concat-obfuscations.js:2:16:2:39 | documen ... .search | user-provided value |

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

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| tst.js:456:18:456:42 | ansiToH ... source) |
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| tst.js:456:18:456:42 | ansiToH ... source) |
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| tst.js:456:36:456:41 | source |
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| tst.js:460:6:460:38 | source |
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| tst.js:460:15:460:38 | documen ... .search |
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| tst.js:460:15:460:38 | documen ... .search |
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| tst.js:463:21:463:26 | source |
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| tst.js:463:21:463:26 | source |
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| tst.js:465:19:465:24 | source |
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| tst.js:465:19:465:24 | source |
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| tst.js:467:20:467:25 | source |
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| tst.js:467:20:467:25 | source |
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| typeahead.js:9:28:9:30 | loc |
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| typeahead.js:9:28:9:30 | loc |
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| typeahead.js:10:16:10:18 | loc |
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| tst.js:453:16:453:39 | documen ... .search | tst.js:453:7:453:39 | source |
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| tst.js:456:36:456:41 | source | tst.js:456:18:456:42 | ansiToH ... source) |
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| tst.js:456:36:456:41 | source | tst.js:456:18:456:42 | ansiToH ... source) |
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| tst.js:460:6:460:38 | source | tst.js:463:21:463:26 | source |
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| tst.js:460:6:460:38 | source | tst.js:463:21:463:26 | source |
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| tst.js:460:6:460:38 | source | tst.js:465:19:465:24 | source |
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| tst.js:460:6:460:38 | source | tst.js:465:19:465:24 | source |
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| tst.js:460:6:460:38 | source | tst.js:467:20:467:25 | source |
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| tst.js:460:6:460:38 | source | tst.js:467:20:467:25 | source |
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| tst.js:460:15:460:38 | documen ... .search | tst.js:460:6:460:38 | source |
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| tst.js:460:15:460:38 | documen ... .search | tst.js:460:6:460:38 | source |
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| typeahead.js:9:28:9:30 | loc | typeahead.js:10:16:10:18 | loc |
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| typeahead.js:9:28:9:30 | loc | typeahead.js:10:16:10:18 | loc |
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| typeahead.js:9:28:9:30 | loc | typeahead.js:10:16:10:18 | loc |

‎javascript/ql/test/query-tests/Security/CWE-079/DomBasedXss/externs.js

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@@ -57,3 +57,13 @@ function Node() {}
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* @type {Node}
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*/
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Node.prototype.parentNode;
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/**
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* @return {DomObjectStub}
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*/
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DomObjectStub.prototype.insertRow = function() {};
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/**
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* @return {DomObjectStub}
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*/
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DomObjectStub.prototype.insertCell = function() {};

‎javascript/ql/test/query-tests/Security/CWE-079/DomBasedXss/tst.js

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@@ -454,4 +454,15 @@ function ansiToHTML() {
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$("#foo").html(source); // NOT OK
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$("#foo").html(ansiToHtml.toHtml(source)); // NOT OK
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}
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}
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function domMethods() {
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var source = document.location.search;
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let table = document.getElementById('mytable');
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table.innerHTML = source; // NOT OK
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let row = table.insertRow(-1);
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row.innerHTML = source; // NOT OK
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let cell = row.insertCell();
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cell.innerHTML = source; // NOT OK
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}

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