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erik-krogherik-krogh
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Merge branch 'js-team-sprint' into priv-file-polish
2 parents 9ba2c98 + 20e9679 commit 1556b62

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‎change-notes/1.25/analysis-javascript.md‎

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| Unsafe expansion of self-closing HTML tag (`js/unsafe-html-expansion`) | security, external/cwe/cwe-079, external/cwe/cwe-116 | Highlights potential XSS vulnerabilities caused by unsafe expansion of self-closing HTML tags. |
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| Unsafe shell command constructed from library input (`js/shell-command-constructed-from-input`) | correctness, security, external/cwe/cwe-078, external/cwe/cwe-088 | Highlights potential command injections due to a shell command being constructed from library inputs. Results are shown on LGTM by default. |
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| Exposure of private files (`js/exposure-of-private-files`) | security, external/cwe/cwe-200 | Highlights servers that serve private files. Results are shown on LGTM by default. |
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| Storage of sensitive information in build artifact (`js/build-artifact-leak`) | security, external/cwe/cwe-312 | Highlights storage of sensitive information in build artifacts. Results are shown on LGTM by default. |
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| Improper code sanitization (`js/bad-code-sanitization`) | security, external/cwe/cwe-094, external/cwe/cwe-079, external/cwe/cwe-116 | Highlights string concatenation where code is constructed without proper sanitization. Results are shown on LGTM by default. |
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## Changes to existing queries

‎javascript/ql/src/Security/CWE-312/BuildArtifactLeak.qhelp‎

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<!DOCTYPE qhelp PUBLIC
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"-//Semmle//qhelp//EN"
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"qhelp.dtd">
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<qhelp>
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<overview>
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<p>
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Sensitive information included in a build artifact can allow an attacker to access
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the sensitive information if the artifact is published.
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</p>
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</overview>
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<recommendation>
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<p>
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Only store information that is meant to be publicly available in a build artifact.
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</p>
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</recommendation>
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<example>
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<p>
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The following example creates a <code>webpack</code> configuration that inserts all environment
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variables from the host into the build artifact:
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</p>
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<sample src="examples/build-leak.js"/>
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<p>
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The environment variables might include API keys or other sensitive information, and the build-system
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should instead insert only the environment variables that are supposed to be public.
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</p>
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<p>
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The issue has been fixed below, where only the <code>DEBUG</code> environment variable is inserted into the artifact.
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</p>
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<sample src="examples/build-leak-fixed.js"/>
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</example>
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<references>
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<li>webpack: <a href="https://webpack.js.org/plugins/define-plugin/">DefinePlugin API</a>.</li>
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</references>
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</qhelp>

‎javascript/ql/src/Security/CWE-312/BuildArtifactLeak.ql‎

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/**
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* @name Storage of sensitive information in build artifact
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* @description Including sensitive information in a build artifact can
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* expose it to an attacker.
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* @kind path-problem
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* @problem.severity error
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* @precision high
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* @id js/build-artifact-leak
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* @tags security
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* external/cwe/cwe-312
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* external/cwe/cwe-315
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* external/cwe/cwe-359
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*/
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import javascript
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import semmle.javascript.security.dataflow.BuildArtifactLeak::BuildArtifactLeak
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import DataFlow::PathGraph
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from Configuration cfg, DataFlow::PathNode source, DataFlow::PathNode sink
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where cfg.hasFlowPath(source, sink)
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select sink.getNode(), source, sink,
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"Sensitive data returned by $@ is stored in a build artifact here.", source.getNode(),
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source.getNode().(CleartextLogging::Source).describe()

‎javascript/ql/src/Security/CWE-312/examples/build-leak-fixed.js‎

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const webpack = require("webpack");
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module.exports = [{
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plugins: [
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new webpack.DefinePlugin({
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'process.env': JSON.stringify({ DEBUG: process.env.DEBUG })
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})
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]
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}];

‎javascript/ql/src/Security/CWE-312/examples/build-leak.js‎

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const webpack = require("webpack");
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module.exports = [{
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plugins: [
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new webpack.DefinePlugin({
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"process.env": JSON.stringify(process.env)
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})
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]
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}];

‎javascript/ql/src/semmle/javascript/Arrays.qll‎

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succ = call
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)
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or
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// `array.reduce` with tainted value in callback
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call.(DataFlow::MethodCallNode).getMethodName() = "reduce" and
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pred = call.getArgument(0).(DataFlow::FunctionNode).getAReturn() and // Require the argument to be a closure to avoid spurious call/return flow
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succ = call
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or
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// `array.push(e)`, `array.unshift(e)`: if `e` is tainted, then so is `array`.
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exists(string name |
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name = "push" or

‎javascript/ql/src/semmle/javascript/security/dataflow/BuildArtifactLeak.qll‎

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/**
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* Provides a dataflow tracking configuration for reasoning about
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* storage of sensitive information in build artifact.
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*
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* Note, for performance reasons: only import this file if
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* `CleartextLogging::Configuration` is needed, otherwise
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* `CleartextLoggingCustomizations` should be imported instead.
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*/
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import javascript
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/**
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* Classes and predicates for storage of sensitive information in build artifact query.
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*/
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module BuildArtifactLeak {
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import BuildArtifactLeakCustomizations::BuildArtifactLeak
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import CleartextLoggingCustomizations::CleartextLogging as CleartextLogging
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/**
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* A taint tracking configuration for storage of sensitive information in build artifact.
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*/
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class Configuration extends TaintTracking::Configuration {
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Configuration() { this = "BuildArtifactLeak" }
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override predicate isSource(DataFlow::Node source, DataFlow::FlowLabel lbl) {
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source.(CleartextLogging::Source).getLabel() = lbl
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}
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override predicate isSink(DataFlow::Node sink, DataFlow::FlowLabel lbl) {
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sink.(Sink).getLabel() = lbl
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}
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override predicate isSanitizer(DataFlow::Node node) {
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node instanceof CleartextLogging::Barrier
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}
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override predicate isSanitizerEdge(DataFlow::Node pred, DataFlow::Node succ) {
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CleartextLogging::isSanitizerEdge(pred, succ)
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}
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override predicate isAdditionalTaintStep(DataFlow::Node src, DataFlow::Node trg) {
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CleartextLogging::isAdditionalTaintStep(src, trg)
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}
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}
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}

‎javascript/ql/src/semmle/javascript/security/dataflow/BuildArtifactLeakCustomizations.qll‎

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/**
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* Provides default sinks for reasoning about storage of sensitive information
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* in build artifact, as well as extension points for adding your own.
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*/
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import javascript
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private import semmle.javascript.dataflow.InferredTypes
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private import semmle.javascript.security.SensitiveActions::HeuristicNames
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/**
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* Sinks for storage of sensitive information in build artifact.
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*/
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module BuildArtifactLeak {
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/**
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* A data flow sink for storage of sensitive information in a build artifact.
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*/
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abstract class Sink extends DataFlow::Node {
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/**
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* Gets a data-flow label that leaks information for this sink.
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*/
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DataFlow::FlowLabel getLabel() { result.isTaint() }
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}
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/**
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* An instantiation of `webpack.DefintePlugin` that stores information in a compiled JavaScript file.
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*/
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class WebpackDefinePluginSink extends Sink {
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WebpackDefinePluginSink() {
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this = DataFlow::moduleMember("webpack", "DefinePlugin").getAnInstantiation().getAnArgument()
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}
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}
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}

‎javascript/ql/src/semmle/javascript/security/dataflow/CleartextLogging.qll‎

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override predicate isSanitizer(DataFlow::Node node) { node instanceof Barrier }
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override predicate isSanitizerEdge(DataFlow::Node pred, DataFlow::Node succ) {
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succ.(DataFlow::PropRead).getBase() = pred
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CleartextLogging::isSanitizerEdge(pred, succ)
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}
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override predicate isAdditionalTaintStep(DataFlow::Node src, DataFlow::Node trg) {
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// A taint propagating data flow edge through objects: a tainted write taints the entire object.
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exists(DataFlow::PropWrite write |
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write.getRhs() = src and
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trg.(DataFlow::SourceNode).flowsTo(write.getBase())
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)
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or
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// Taint through the arguments object.
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exists(DataFlow::CallNode call, Function f |
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src = call.getAnArgument() and
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f = call.getACallee() and
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not call.isImprecise() and
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trg.asExpr() = f.getArgumentsVariable().getAnAccess()
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)
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CleartextLogging::isAdditionalTaintStep(src, trg)
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}
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}
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}

‎javascript/ql/src/semmle/javascript/security/dataflow/CleartextLoggingCustomizations.qll‎

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override string describe() { result = "process environment" }
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override DataFlow::FlowLabel getLabel() {
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result.isTaint() or
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result instanceof PartiallySensitiveMap
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}
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override DataFlow::FlowLabel getLabel() { result.isTaint() }
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}
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/**
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* Holds if the edge `pred` -> `succ` should be sanitized for clear-text logging of sensitive information.
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*/
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predicate isSanitizerEdge(DataFlow::Node pred, DataFlow::Node succ) {
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succ.(DataFlow::PropRead).getBase() = pred
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}
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/**
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* A flow label describing a map that might contain sensitive information in some properties.
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* Property reads on such maps where the property name is fixed is unlikely to leak sensitive information.
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* Holds if the edge `src` -> `trg` is an additional taint-step for clear-text logging of sensitive information.
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*/
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class PartiallySensitiveMap extends DataFlow::FlowLabel {
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PartiallySensitiveMap() { this = "PartiallySensitiveMap" }
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predicate isAdditionalTaintStep(DataFlow::Node src, DataFlow::Node trg) {
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// A taint propagating data flow edge through objects: a tainted write taints the entire object.
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exists(DataFlow::PropWrite write |
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write.getRhs() = src and
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trg.(DataFlow::SourceNode).flowsTo(write.getBase())
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)
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or
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// A property-copy step,
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// dst[x] = src[x]
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// dst[x] = JSON.stringify(src[x])
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exists(DataFlow::PropWrite write, DataFlow::PropRead read |
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read = write.getRhs()
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or
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exists(DataFlow::MethodCallNode stringify |
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stringify = write.getRhs() and
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stringify = DataFlow::globalVarRef("JSON").getAMethodCall("stringify") and
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stringify.getArgument(0) = read
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)
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|
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not exists(write.getPropertyName()) and
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not exists(read.getPropertyName()) and
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src = read.getBase() and
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trg = write.getBase().getALocalSource()
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)
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or
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// Taint through the arguments object.
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exists(DataFlow::CallNode call, Function f |
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src = call.getAnArgument() and
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f = call.getACallee() and
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not call.isImprecise() and
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trg.asExpr() = f.getArgumentsVariable().getAnAccess()
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)
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}
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}

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