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add a taint-step through URL.createObjectURL for js/xss-through-dom

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This commit is contained in:
Erik Krogh Kristensen
2022-04-06 12:18:47 +02:00
parent b11d48e749
commit 0435cee57f
3 changed files with 17 additions and 0 deletions
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5
javascript/ql/lib/semmle/javascript/security/dataflow/XssThroughDomQuery.qll
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@@ -36,6 +36,11 @@ class Configuration extends TaintTracking::Configuration {
DomBasedXss::isOptionallySanitizedEdge(pred, succ)
}
override predicate isAdditionalTaintStep(DataFlow::Node pred, DataFlow::Node succ) {
succ = DataFlow::globalVarRef("URL").getAMemberCall("createObjectURL") and
pred = succ.(DataFlow::InvokeNode).getArgument(0)
}
override predicate hasFlowPath(DataFlow::SourcePathNode src, DataFlow::SinkPathNode sink) {
super.hasFlowPath(src, sink) and
// filtering away readings of `src` that end in a URL sink.

10
javascript/ql/test/query-tests/Security/CWE-079/XssThroughDom/XssThroughDom.expected
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@@ -134,6 +134,11 @@ nodes
| xss-through-dom.js:120:23:120:40 | ev.target.files[0] |
| xss-through-dom.js:120:23:120:45 | ev.targ ... 0].name |
| xss-through-dom.js:120:23:120:45 | ev.targ ... 0].name |
| xss-through-dom.js:122:33:122:71 | URL.cre ... les[0]) |
| xss-through-dom.js:122:33:122:71 | URL.cre ... les[0]) |
| xss-through-dom.js:122:53:122:67 | ev.target.files |
| xss-through-dom.js:122:53:122:67 | ev.target.files |
| xss-through-dom.js:122:53:122:70 | ev.target.files[0] |
edges
| forms.js:8:23:8:28 | values | forms.js:9:31:9:36 | values |
| forms.js:8:23:8:28 | values | forms.js:9:31:9:36 | values |
@@ -216,6 +221,10 @@ edges
| xss-through-dom.js:120:23:120:37 | ev.target.files | xss-through-dom.js:120:23:120:40 | ev.target.files[0] |
| xss-through-dom.js:120:23:120:40 | ev.target.files[0] | xss-through-dom.js:120:23:120:45 | ev.targ ... 0].name |
| xss-through-dom.js:120:23:120:40 | ev.target.files[0] | xss-through-dom.js:120:23:120:45 | ev.targ ... 0].name |
| xss-through-dom.js:122:53:122:67 | ev.target.files | xss-through-dom.js:122:53:122:70 | ev.target.files[0] |
| xss-through-dom.js:122:53:122:67 | ev.target.files | xss-through-dom.js:122:53:122:70 | ev.target.files[0] |
| xss-through-dom.js:122:53:122:70 | ev.target.files[0] | xss-through-dom.js:122:33:122:71 | URL.cre ... les[0]) |
| xss-through-dom.js:122:53:122:70 | ev.target.files[0] | xss-through-dom.js:122:33:122:71 | URL.cre ... les[0]) |
#select
| forms.js:9:31:9:40 | values.foo | forms.js:8:23:8:28 | values | forms.js:9:31:9:40 | values.foo | $@ is reinterpreted as HTML without escaping meta-characters. | forms.js:8:23:8:28 | values | DOM text |
| forms.js:12:31:12:40 | values.bar | forms.js:11:24:11:29 | values | forms.js:12:31:12:40 | values.bar | $@ is reinterpreted as HTML without escaping meta-characters. | forms.js:11:24:11:29 | values | DOM text |
@@ -252,3 +261,4 @@ edges
| xss-through-dom.js:109:31:109:70 | "<a src ... oo</a>" | xss-through-dom.js:109:45:109:55 | this.el.src | xss-through-dom.js:109:31:109:70 | "<a src ... oo</a>" | $@ is reinterpreted as HTML without escaping meta-characters. | xss-through-dom.js:109:45:109:55 | this.el.src | DOM text |
| xss-through-dom.js:115:16:115:18 | src | xss-through-dom.js:114:17:114:52 | documen ... k").src | xss-through-dom.js:115:16:115:18 | src | $@ is reinterpreted as HTML without escaping meta-characters. | xss-through-dom.js:114:17:114:52 | documen ... k").src | DOM text |
| xss-through-dom.js:120:23:120:45 | ev.targ ... 0].name | xss-through-dom.js:120:23:120:37 | ev.target.files | xss-through-dom.js:120:23:120:45 | ev.targ ... 0].name | $@ is reinterpreted as HTML without escaping meta-characters. | xss-through-dom.js:120:23:120:37 | ev.target.files | DOM text |
| xss-through-dom.js:122:33:122:71 | URL.cre ... les[0]) | xss-through-dom.js:122:53:122:67 | ev.target.files | xss-through-dom.js:122:33:122:71 | URL.cre ... les[0]) | $@ is reinterpreted as HTML without escaping meta-characters. | xss-through-dom.js:122:53:122:67 | ev.target.files | DOM text |

2
javascript/ql/test/query-tests/Security/CWE-079/XssThroughDom/xss-through-dom.js
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@@ -118,5 +118,7 @@ class Sub extends Super {
$("input.foo")[0].onchange = function (ev) {
$("#id").html(ev.target.files[0].name); // NOT OK.
$("img#id").attr("src", URL.createObjectURL(ev.target.files[0])); // NOT OK
}
})();