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feat: add freemarker template injection guidance hook #1007
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61 changes: 61 additions & 0 deletions
61
sanitizers/src/main/java/com/code_intelligence/jazzer/sanitizers/TemplateInjection.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| /* | ||
| * Copyright 2025 Code Intelligence GmbH | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| package com.code_intelligence.jazzer.sanitizers | ||
|
|
||
| import com.code_intelligence.jazzer.api.HookType | ||
| import com.code_intelligence.jazzer.api.Jazzer | ||
| import com.code_intelligence.jazzer.api.MethodHook | ||
| import java.io.Reader | ||
| import java.lang.invoke.MethodHandle | ||
|
|
||
| /** | ||
| * Guides FreeMarker templates towards patterns that can trigger OS command injections. | ||
| * | ||
| * This does not report findings directly; it steers inputs towards OS command injections, | ||
| * which are detected by another bug detector. | ||
| */ | ||
| @Suppress("unused_parameter", "unused") | ||
| object TemplateInjection { | ||
| private const val FREEMARKER_INJECTION_ATTACK: String = "\${\"freemarker.template.utility.Execute\"?new()(\"jazze\")}" | ||
|
|
||
| init { | ||
| require(FREEMARKER_INJECTION_ATTACK.length <= 64) { | ||
| "Expression language exploit must fit in a table of recent compares entry (64 bytes)" | ||
| } | ||
| } | ||
|
|
||
| @MethodHook( | ||
| type = HookType.BEFORE, | ||
| targetClassName = "freemarker.template.Template", | ||
| targetMethod = "<init>", | ||
| ) | ||
| @JvmStatic | ||
| fun hookFreemarker( | ||
| method: MethodHandle?, | ||
| thisObject: Any?, | ||
| arguments: Array<Any>, | ||
| hookId: Int, | ||
| ) { | ||
| if (arguments.size < 2) return | ||
| val reader = arguments[1] as? Reader ?: return | ||
| Jazzer.guideTowardsContainment( | ||
| peekMarkableReader(reader, FREEMARKER_INJECTION_ATTACK.length), | ||
| FREEMARKER_INJECTION_ATTACK, | ||
| hookId, | ||
| ) | ||
| } | ||
| } |
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36 changes: 36 additions & 0 deletions
36
sanitizers/src/test/java/com/example/TemplateInjection.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,36 @@ | ||
| /* | ||
| * Copyright 2025 Code Intelligence GmbH | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| package com.example; | ||
|
|
||
| import com.code_intelligence.jazzer.api.FuzzedDataProvider; | ||
| import freemarker.template.Template; | ||
| import java.io.StringReader; | ||
| import java.io.StringWriter; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
|
|
||
| public class TemplateInjection { | ||
| public static void fuzzerTestOneInput(FuzzedDataProvider fdp) throws Exception { | ||
| Map<String, Object> model = new HashMap<>(); | ||
| String data = fdp.consumeRemainingAsString(); | ||
| try { | ||
| Template tmpl = new Template("test", new StringReader(data)); | ||
| tmpl.process(model, new StringWriter()); | ||
| } catch (Throwable ignored) { | ||
| } | ||
| } | ||
| } |
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Should this have
tags = ["dangerous"]in case it can trigger OS command execution?There was a problem hiding this comment.
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Thank you, you are right!