Merge pull request #216 from hh-hunter:adselfservice_plus_cve_2021_40539

PiperOrigin-RevId: 433605407
Change-Id: I429f44480182cdef633828d604c602e570ff0b54

community/detectors/adselfservice_plus_cve_2021_40539/README.md

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+# CVE-2021-40539 VulnDetector
+
+This detector checks for ADSelfService Plus REST API Authentication Bypass (RCE)  vulnerability (CVE-2021-40539).
+Zoho ManageEngine ADSelfService Plus version 6113 and prior is vulnerable to REST API authentication bypass with resultant remote code execution.
+
+- https://www.manageengine.com/products/self-service-password/kb/how-to-fix-authentication-bypass-vulnerability-in-REST-API.html
+- https://www.manageengine.com/products/self-service-password/release-notes.html
+- https://www.synacktiv.com/publications/how-to-exploit-cve-2021-40539-on-manageengine-adselfservice-plus.html
+- https://www.rapid7.com/db/vulnerabilities/zoho-manageengine-adselfservice-plus-cve-2021-40539/
+
+## Build jar file for this plugin
+
+Using `gradlew`:
+
+```shell
+./gradlew jar
+```
+
+Tsunami identifiable jar file is located at `build/libs` directory.

community/detectors/adselfservice_plus_cve_2021_40539/build.gradle

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+plugins {
+    id 'java-library'
+}
+
+description = 'Tsunami CVE-2021-40539 VulnDetector plugin.'
+group 'com.google.tsunami'
+version '0.0.1-SNAPSHOT'
+
+
+repositories {
+    maven { // The google mirror is less flaky than mavenCentral()
+        url 'https://maven-central.storage-download.googleapis.com/repos/central/data/'
+    }
+    mavenCentral()
+    mavenLocal()
+}
+
+java {
+    sourceCompatibility = JavaVersion.VERSION_11
+    targetCompatibility = JavaVersion.VERSION_11
+
+    jar.manifest {
+        attributes('Implementation-Title': name,
+                'Implementation-Version': version,
+                'Built-By': System.getProperty('user.name'),
+                'Built-JDK': System.getProperty('java.version'),
+                'Source-Compatibility': sourceCompatibility,
+                'Target-Compatibility': targetCompatibility)
+    }
+
+    javadoc.options {
+        encoding = 'UTF-8'
+        use = true
+        links 'https://docs.oracle.com/javase/8/docs/api/'
+    }
+
+    // Log stacktrace to console when test fails.
+    test {
+        testLogging {
+            exceptionFormat = 'full'
+            showExceptions true
+            showCauses true
+            showStackTraces true
+        }
+        maxHeapSize = '1500m'
+    }
+}
+
+ext {
+    tsunamiVersion = '0.0.7'
+    junitVersion = '4.13'
+    mockitoVersion = '2.28.2'
+    truthVersion = '1.0.1'
+    okhttpVersion = '3.12.0'
+}
+
+dependencies {
+    implementation "com.google.tsunami:tsunami-common:${tsunamiVersion}"
+    implementation "com.google.tsunami:tsunami-plugin:${tsunamiVersion}"
+    implementation "com.google.tsunami:tsunami-proto:${tsunamiVersion}"
+    implementation 'com.google.googlejavaformat:google-java-format:1.13.0'
+
+    testImplementation "junit:junit:${junitVersion}"
+    testImplementation "org.mockito:mockito-core:${mockitoVersion}"
+    testImplementation "com.google.truth:truth:${truthVersion}"
+    testImplementation "com.squareup.okhttp3:mockwebserver:${okhttpVersion}"
+    testImplementation "com.google.truth.extensions:truth-java8-extension:${truthVersion}"
+    testImplementation "com.google.truth.extensions:truth-proto-extension:${truthVersion}"
+}

community/detectors/adselfservice_plus_cve_2021_40539/settings.gradle

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+rootProject.name = 'CVE-2021-40539'

community/detectors/adselfservice_plus_cve_2021_40539/src/main/java/com/google/tsunami/plugins/detectors/cves/cve202140539/Cve202140539DetectorBootstrapModule.java

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+/*
+ * Copyright 2021 Google LLC
+ *
+ * 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.google.tsunami.plugins.detectors.cves.cve202140539;
+
+import com.google.tsunami.plugin.PluginBootstrapModule;
+
+/**
+ * An CVE-2021-40539 Guice module that bootstraps the {@link Cve202140539VulnDetector}.
+ */
+public final class Cve202140539DetectorBootstrapModule extends PluginBootstrapModule {
+
+  @Override
+  protected void configurePlugin() {
+    registerPlugin(Cve202140539VulnDetector.class);
+  }
+}

community/detectors/adselfservice_plus_cve_2021_40539/src/main/java/com/google/tsunami/plugins/detectors/cves/cve202140539/Cve202140539VulnDetector.java

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+/*
+ * Copyright 2021 Google LLC
+ *
+ * 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.google.tsunami.plugins.detectors.cves.cve202140539;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static com.google.common.collect.ImmutableList.toImmutableList;
+import static com.google.common.net.HttpHeaders.CONTENT_TYPE;
+import static com.google.tsunami.common.data.NetworkEndpointUtils.toUriAuthority;
+import static com.google.tsunami.common.net.http.HttpRequest.post;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.collect.ImmutableList;
+import com.google.common.flogger.GoogleLogger;
+import com.google.common.net.MediaType;
+import com.google.protobuf.ByteString;
+import com.google.protobuf.util.Timestamps;
+import com.google.tsunami.common.data.NetworkServiceUtils;
+import com.google.tsunami.common.net.http.HttpClient;
+import com.google.tsunami.common.net.http.HttpHeaders;
+import com.google.tsunami.common.net.http.HttpResponse;
+import com.google.tsunami.common.time.UtcClock;
+import com.google.tsunami.plugin.PluginType;
+import com.google.tsunami.plugin.VulnDetector;
+import com.google.tsunami.plugin.annotations.PluginInfo;
+import com.google.tsunami.proto.DetectionReport;
+import com.google.tsunami.proto.DetectionReportList;
+import com.google.tsunami.proto.DetectionStatus;
+import com.google.tsunami.proto.NetworkService;
+import com.google.tsunami.proto.Severity;
+import com.google.tsunami.proto.TargetInfo;
+import com.google.tsunami.proto.Vulnerability;
+import com.google.tsunami.proto.VulnerabilityId;
+import java.io.IOException;
+import java.time.Clock;
+import java.time.Instant;
+import javax.inject.Inject;
+
+/** A {@link VulnDetector} that detects the CVE-2021-40539 vulnerability. */
+@PluginInfo(
+    type = PluginType.VULN_DETECTION,
+    name = "CVE202140539VulnDetector",
+    version = "0.1",
+    description = Cve202140539VulnDetector.VULN_DESCRIPTION,
+    author = "hh-hunter",
+    bootstrapModule = Cve202140539DetectorBootstrapModule.class)
+public final class Cve202140539VulnDetector implements VulnDetector {
+
+  @VisibleForTesting
+  static final String DETECTION_STRING = "<script type=\"text/javascript\">var d = new Date();";
+
+  @VisibleForTesting
+  static final String VULN_DESCRIPTION =
+      "Zoho ManageEngine ADSelfService Plus version 6113 and prior is vulnerable to REST API "
+          + "authentication bypass with resultant remote code execution.";
+
+  private static final GoogleLogger logger = GoogleLogger.forEnclosingClass();
+
+  private static final String VUL_PATH = "./RestAPI/LogonCustomization";
+
+  private static final String POST_DATA = "methodToCall=previewMobLogo";
+
+  private final HttpClient httpClient;
+
+  private final Clock utcClock;
+
+  @Inject
+  Cve202140539VulnDetector(@UtcClock Clock utcClock, HttpClient httpClient) {
+    this.httpClient = checkNotNull(httpClient);
+    this.utcClock = checkNotNull(utcClock);
+  }
+
+  private static boolean isWebServiceOrUnknownService(NetworkService networkService) {
+    return networkService.getServiceName().isEmpty()
+        || NetworkServiceUtils.isWebService(networkService)
+        || NetworkServiceUtils.getServiceName(networkService).equals("sun-answerbook");
+  }
+
+  private static StringBuilder buildTarget(NetworkService networkService) {
+    StringBuilder targetUrlBuilder = new StringBuilder();
+    if (NetworkServiceUtils.isWebService(networkService)) {
+      targetUrlBuilder.append(NetworkServiceUtils.buildWebApplicationRootUrl(networkService));
+    } else {
+      targetUrlBuilder
+          .append("http://")
+          .append(toUriAuthority(networkService.getNetworkEndpoint()))
+          .append("/");
+    }
+    targetUrlBuilder.append(VUL_PATH);
+    return targetUrlBuilder;
+  }
+
+  @Override
+  public DetectionReportList detect(
+      TargetInfo targetInfo, ImmutableList<NetworkService> matchedServices) {
+    logger.atInfo().log("CVE-2921-40539 starts detecting.");
+
+    return DetectionReportList.newBuilder()
+        .addAllDetectionReports(
+            matchedServices.stream()
+                .filter(Cve202140539VulnDetector::isWebServiceOrUnknownService)
+                .filter(this::isServiceVulnerable)
+                .map(networkService -> buildDetectionReport(targetInfo, networkService))
+                .collect(toImmutableList()))
+        .build();
+  }
+
+  private boolean isServiceVulnerable(NetworkService networkService) {
+    String targetVulnerabilityUrl = buildTarget(networkService).toString();
+    try {
+      HttpResponse httpResponse =
+          httpClient.sendAsIs(
+              post(targetVulnerabilityUrl)
+                  .setHeaders(
+                      HttpHeaders.builder()
+                          .addHeader(CONTENT_TYPE, MediaType.FORM_DATA.toString())
+                          .build())
+                  .setRequestBody(ByteString.copyFromUtf8(POST_DATA))
+                  .build());
+      if (httpResponse.status().code() == 200
+          && httpResponse.bodyString().get().contains(DETECTION_STRING)) {
+        return true;
+      }
+    } catch (IOException | AssertionError e) {
+      logger.atWarning().withCause(e).log("Request to target %s failed", networkService);
+      return false;
+    }
+    return false;
+  }
+
+  private DetectionReport buildDetectionReport(
+      TargetInfo targetInfo, NetworkService vulnerableNetworkService) {
+    return DetectionReport.newBuilder()
+        .setTargetInfo(targetInfo)
+        .setNetworkService(vulnerableNetworkService)
+        .setDetectionTimestamp(Timestamps.fromMillis(Instant.now(utcClock).toEpochMilli()))
+        .setDetectionStatus(DetectionStatus.VULNERABILITY_VERIFIED)
+        .setVulnerability(
+            Vulnerability.newBuilder()
+                .setMainId(
+                    VulnerabilityId.newBuilder()
+                        .setPublisher("TSUNAMI_COMMUNITY")
+                        .setValue("CVE_2021_40539"))
+                .setSeverity(Severity.CRITICAL)
+                .setTitle("CVE-2021-40539 ADSelfService Plus REST API Authentication Bypass (RCE)")
+                .setRecommendation(
+                    "1. Disconnect the affected system from your network.\n2. Back up the "
+                        + "ADSelfService Plus database using these steps.\n3. Format the "
+                        + "compromised machine. \n4. Download and install ADSelfService Plus. \n"
+                        + "5. Restore the backup and start the server.\n6. Once the server is up "
+                        + "and running, update ADSelfService Plus to the latest build, 6114, using"
+                        + " the service pack.\n7. Check for unauthorized access or use of accounts."
+                        + " Also, check for any evidences of lateral movement from the compromised"
+                        + " machine to other machines. If there are any indications of compromised"
+                        + " Active Directory accounts, initiate password reset for those accounts.")
+                .setDescription(VULN_DESCRIPTION))
+        .build();
+  }
+}