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Merge pull request #2898 from asger-semmle/js/prototype-pollution-isobject-sanitizers
Approved by erik-krogh
2 parents 2d9df70 + f923b24 commit 317356e

3 files changed

Lines changed: 153 additions & 1 deletion

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‎javascript/ql/src/Security/CWE-400/PrototypePollutionUtility.ql‎

Lines changed: 21 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -199,7 +199,8 @@ class PropNameTracking extends DataFlow::Configuration {
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node instanceof InstanceOfGuard or
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node instanceof TypeofGuard or
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node instanceof BlacklistInclusionGuard or
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node instanceof WhitelistInclusionGuard
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node instanceof WhitelistInclusionGuard or
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node instanceof IsPlainObjectGuard
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}
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}
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@@ -374,6 +375,25 @@ class WhitelistInclusionGuard extends DataFlow::LabeledBarrierGuardNode {
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}
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}
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/**
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* A check of form `isPlainObject(e)` or similar, which sanitizes the `constructor`
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* payload in the true case, since it rejects objects with a non-standard `constructor`
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* property.
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*/
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class IsPlainObjectGuard extends DataFlow::LabeledBarrierGuardNode, DataFlow::CallNode {
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IsPlainObjectGuard() {
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exists(string name | name = "is-plain-object" or name = "is-extendable" |
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this = moduleImport(name).getACall()
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)
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}
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override predicate blocks(boolean outcome, Expr e, DataFlow::FlowLabel lbl) {
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e = getArgument(0).asExpr() and
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outcome = true and
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lbl = "constructor"
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}
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}
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/**
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* Gets a meaningful name for `node` if possible.
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*/

‎javascript/ql/test/query-tests/Security/CWE-400/PrototypePollutionUtility.expected‎

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@@ -2457,6 +2505,64 @@ edges
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| PrototypePollutionUtility/tests.js:467:26:467:28 | dst | PrototypePollutionUtility/tests.js:471:29:471:31 | dst |
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| PrototypePollutionUtility/tests.js:467:26:467:28 | dst | PrototypePollutionUtility/tests.js:473:13:473:15 | dst |
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| PrototypePollutionUtility/tests.js:467:31:467:33 | src | PrototypePollutionUtility/tests.js:471:39:471:41 | src |
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| examples/PrototypePollutionUtility.js:1:16:1:18 | dst | examples/PrototypePollutionUtility.js:5:19:5:21 | dst |
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@@ -2583,4 +2689,5 @@ edges
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| PrototypePollutionUtility/tests.js:450:30:450:32 | dst | PrototypePollutionUtility/tests.js:444:25:444:27 | key | PrototypePollutionUtility/tests.js:450:30:450:32 | dst | Properties are copied from $@ to $@ without guarding against prototype pollution. | PrototypePollutionUtility/tests.js:444:12:444:14 | src | src | PrototypePollutionUtility/tests.js:450:30:450:32 | dst | dst |
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| PrototypePollutionUtility/tests.js:451:30:451:32 | dst | PrototypePollutionUtility/tests.js:444:25:444:27 | key | PrototypePollutionUtility/tests.js:451:30:451:32 | dst | Properties are copied from $@ to $@ without guarding against prototype pollution. | PrototypePollutionUtility/tests.js:444:12:444:14 | src | src | PrototypePollutionUtility/tests.js:451:30:451:32 | dst | dst |
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| PrototypePollutionUtility/tests.js:461:13:461:15 | dst | PrototypePollutionUtility/tests.js:457:25:457:27 | key | PrototypePollutionUtility/tests.js:461:13:461:15 | dst | Properties are copied from $@ to $@ without guarding against prototype pollution. | PrototypePollutionUtility/tests.js:457:12:457:14 | src | src | PrototypePollutionUtility/tests.js:461:13:461:15 | dst | dst |
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| PrototypePollutionUtility/tests.js:473:13:473:15 | dst | PrototypePollutionUtility/tests.js:468:14:468:16 | key | PrototypePollutionUtility/tests.js:473:13:473:15 | dst | Properties are copied from $@ to $@ without guarding against prototype pollution. | PrototypePollutionUtility/tests.js:468:21:468:23 | src | src | PrototypePollutionUtility/tests.js:473:13:473:15 | dst | dst |
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| examples/PrototypePollutionUtility.js:7:13:7:15 | dst | examples/PrototypePollutionUtility.js:2:14:2:16 | key | examples/PrototypePollutionUtility.js:7:13:7:15 | dst | Properties are copied from $@ to $@ without guarding against prototype pollution. | examples/PrototypePollutionUtility.js:2:21:2:23 | src | src | examples/PrototypePollutionUtility.js:7:13:7:15 | dst | dst |

‎javascript/ql/test/query-tests/Security/CWE-400/PrototypePollutionUtility/tests.js‎

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@@ -462,3 +462,28 @@ function copyUsingUnderscoreOrLodash(dst, src) {
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}
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});
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}
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let isPlainObject = require('is-plain-object');
467+
function copyPlainObject(dst, src) {
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for (let key in src) {
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if (key === '__proto__') continue;
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if (dst[key] && isPlainObject(src)) {
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copyPlainObject(dst[key], src[key]);
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} else {
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dst[key] = src[key]; // OK - but flagged anyway
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}
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}
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}
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function copyPlainObject2(dst, src) {
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for (let key in src) {
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if (key === '__proto__') continue;
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let target = dst[key];
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let value = src[key];
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if (isPlainObject(target) && isPlainObject(value)) {
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copyPlainObject2(target, value);
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} else {
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dst[key] = value; // OK
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}
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}
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}

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