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recognize returning an instanceof of a class as exporting that class

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This commit is contained in:
erik-krogh
2022-09-12 17:29:20 +02:00
parent a8a7909d33
commit ceda5f69fc
3 changed files with 37 additions and 0 deletions
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10
javascript/ql/lib/semmle/javascript/PackageExports.qll
View File

@@ -52,6 +52,16 @@ private DataFlow::Node getAValueExportedByPackage() {
not isPrivateMethodDeclaration(result)
)
or
// module.exports.foo = function () {
// return new Foo(); // <- result
// };
exists(DataFlow::FunctionNode func, DataFlow::NewNode inst, DataFlow::ClassNode clz |
func = getAValueExportedByPackage().getALocalSource() and inst = unique( | | func.getAReturn())
|
clz.getAnInstanceReference() = inst and
result = clz.getAnInstanceMethod()
)
or
result = getAValueExportedByPackage().getALocalSource()
or
// Nested property reads.

12
javascript/ql/test/query-tests/Security/CWE-915/PrototypePollutingAssignment/PrototypePollutingAssignment.expected
View File

@@ -111,6 +111,12 @@ nodes
| lib.js:119:13:119:24 | obj[path[0]] |
| lib.js:119:17:119:20 | path |
| lib.js:119:17:119:23 | path[0] |
| lib.js:127:14:127:17 | path |
| lib.js:127:14:127:17 | path |
| lib.js:128:9:128:20 | obj[path[0]] |
| lib.js:128:9:128:20 | obj[path[0]] |
| lib.js:128:13:128:16 | path |
| lib.js:128:13:128:19 | path[0] |
| sublib/sub.js:1:37:1:40 | path |
| sublib/sub.js:1:37:1:40 | path |
| sublib/sub.js:2:3:2:14 | obj[path[0]] |
@@ -269,6 +275,11 @@ edges
| lib.js:119:17:119:20 | path | lib.js:119:17:119:23 | path[0] |
| lib.js:119:17:119:23 | path[0] | lib.js:119:13:119:24 | obj[path[0]] |
| lib.js:119:17:119:23 | path[0] | lib.js:119:13:119:24 | obj[path[0]] |
| lib.js:127:14:127:17 | path | lib.js:128:13:128:16 | path |
| lib.js:127:14:127:17 | path | lib.js:128:13:128:16 | path |
| lib.js:128:13:128:16 | path | lib.js:128:13:128:19 | path[0] |
| lib.js:128:13:128:19 | path[0] | lib.js:128:9:128:20 | obj[path[0]] |
| lib.js:128:13:128:19 | path[0] | lib.js:128:9:128:20 | obj[path[0]] |
| sublib/sub.js:1:37:1:40 | path | sublib/sub.js:2:7:2:10 | path |
| sublib/sub.js:1:37:1:40 | path | sublib/sub.js:2:7:2:10 | path |
| sublib/sub.js:2:7:2:10 | path | sublib/sub.js:2:7:2:13 | path[0] |
@@ -329,6 +340,7 @@ edges
| lib.js:87:10:87:14 | proto | lib.js:83:14:83:22 | arguments | lib.js:87:10:87:14 | proto | This assignment may alter Object.prototype if a malicious '__proto__' string is injected from $@. | lib.js:83:14:83:22 | arguments | library input |
| lib.js:108:3:108:10 | obj[one] | lib.js:104:13:104:21 | arguments | lib.js:108:3:108:10 | obj[one] | This assignment may alter Object.prototype if a malicious '__proto__' string is injected from $@. | lib.js:104:13:104:21 | arguments | library input |
| lib.js:119:13:119:24 | obj[path[0]] | lib.js:118:29:118:32 | path | lib.js:119:13:119:24 | obj[path[0]] | This assignment may alter Object.prototype if a malicious '__proto__' string is injected from $@. | lib.js:118:29:118:32 | path | library input |
| lib.js:128:9:128:20 | obj[path[0]] | lib.js:127:14:127:17 | path | lib.js:128:9:128:20 | obj[path[0]] | This assignment may alter Object.prototype if a malicious '__proto__' string is injected from $@. | lib.js:127:14:127:17 | path | library input |
| sublib/sub.js:2:3:2:14 | obj[path[0]] | sublib/sub.js:1:37:1:40 | path | sublib/sub.js:2:3:2:14 | obj[path[0]] | This assignment may alter Object.prototype if a malicious '__proto__' string is injected from $@. | sublib/sub.js:1:37:1:40 | path | library input |
| tst.js:8:5:8:17 | object[taint] | tst.js:5:24:5:37 | req.query.data | tst.js:8:5:8:17 | object[taint] | This assignment may alter Object.prototype if a malicious '__proto__' string is injected from $@. | tst.js:5:24:5:37 | req.query.data | user controlled input |
| tst.js:9:5:9:17 | object[taint] | tst.js:5:24:5:37 | req.query.data | tst.js:9:5:9:17 | object[taint] | This assignment may alter Object.prototype if a malicious '__proto__' string is injected from $@. | tst.js:5:24:5:37 | req.query.data | user controlled input |

15
javascript/ql/test/query-tests/Security/CWE-915/PrototypePollutingAssignment/lib.js
View File

@@ -119,4 +119,19 @@ module.exports.returnsObj = function () {
obj[path[0]][path[1]] = value; // NOT OK
}
}
}
class MyClass {
constructor() {}
set(obj, path, value) {
obj[path[0]][path[1]] = value; // NOT OK
}
static staticSet(obj, path, value) {
obj[path[0]][path[1]] = value; // OK - not exported
}
}
module.exports.returnsMewMyClass = function () {
return new MyClass();
}