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ManageEngine AssetExplorer Authenticated Command Execution

ManageEngine AssetExplorer Authenticated Command Execution
Posted May 15, 2020
Authored by Sahil Dhar, xen1thLabs

ManageEngine AssetExplorer versions prior to 6.5 (6503) suffer from an authenticated remote command execution vulnerability.

tags | exploit, remote
advisories | CVE-2019-19034
MD5 | 7b8d9baa42ea19829e2e131700345178

ManageEngine AssetExplorer Authenticated Command Execution

Change Mirror Download
XL-2020-004 - Asset Explorer (Windows & Linux) - Authenticated Command Execution

===============================================================================



Identifiers

-------------------------------------------------

* CVE-2019-19034

* XL-20-004



CVSSv3 score

-------------------------------------------------

7.2 (AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H)



Vendor

-------------------------------------------------

ManageEngine - [https://www.manageengine.com/products/asset-explorer/](https://www.manageengine.com/products/asset-explorer/)



Product

-------------------------------------------------

ManageEngine AssetExplorer is a web-based IT Asset Management (ITAM) software that helps you monitor and manage assets in your network from Planning phase to Disposal phase. AssetExplorer provides you with a number of ways to ensure discovery of all the assets in your network. You can manage software & hardware assets, ensure software license compliance and track purchase orders & contracts - the whole nine yards! AssetExplorer is very easy to install and works right out of the box.



Affected versions

-------------------------------------------------

- All versions prior to 6.5 (6503)



Credit

-------------------------------------------------

Sahil Dhar - xen1thLabs - Software Labs



Vulnerability summary

-------------------------------------------------

ManageEngine Asset Explorer application does not validate System Center Configuration Manager (SCCM) database username when dynamically generating a command to schedule scans for SCCM. The vulnerability allows an attacker to execute arbitrary commands on the AssetExplorer Server with NT AUTHORITY/SYSTEM privileges.



Technical details

-------------------------------------------------

The username is concatenated to the system command on line `143` and `144` of `SccmTask.java` from `AdventNetAsset.jar` package, before being executed through the `exec()` method from `java.lang.Runtime` class on line `147` or `149`.



The following code snippet displays the vulnerable souce code:



```java

/*

Package Name: AdventNetAsset.jar

FileName: SccmTask.java

*/

123: prop.setProperty("hostName", sccmHostName);

124: prop.setProperty("databaseName", sccmDbName);

125: prop.setProperty("domain", "-".equals(sccmDomain) ? "" : sccmDomain);

126: prop.setProperty("username", sccmUserName);

127: prop.setProperty("port", sccmPortNum);

128: prop.setProperty("password", Encoder.convertFromBase(sccmPassword));

129:

130: DBConnectorUtil connectionTester = new DBConnectorUtil(prop, false);

131:

132: HashMap<String, Object> auditStart = new HashMap();

133: auditStart.put("sccmId", sccmConfigId);

134: auditStart.put("sccmName", sccmName);

135: auditStart.put("startTime", new Timestamp(startTime.longValue()));

136: auditStart.put("auditToken", auditId);

137: SCCMUtil.updateSCCMScanStartAudit(auditStart);

138:

140: if (connectionTester.testConnection())

141: {

142: logger.log(Level.INFO, "Connection has been established with the required SCCM");

143: String runSccmWindows = "SCCMScheduler.bat " + sccmDomain + " " + sccmPortNum + " " + sccmDbName + " " + sccmHostName + " " + sccmUserName + " " + sccmPassword + " " + sccmConfigId.toString() + " " + auditId + " " + siteId + " " + auditURL;

144: String runSccmLinux = "sh SCCMScheduler.sh " + sccmDomain + " " + sccmPortNum + " " + sccmDbName + " " + sccmHostName + " " + sccmUserName + " " + sccmPassword + " " + sccmConfigId.toString() + " " + auditId + " " + siteId + " " + auditURL;

145: if (System.getProperty("os.name").indexOf("Windows") != -1)

146: {

147: Runtime.getRuntime().exec(runSccmWindows);

148: } else {

149: Runtime.getRuntime().exec(runSccmLinux);

150: }

151: logger.log(Level.INFO, "SCCM Scanner is lauched. Log file is created in directory: ROOT/logs/SCCMLogs/");

152: }

```



Proof of concept

-------------------------------------------------

1. Set `| calc.exe &` as a username of one of the databases of the SCCM database server.

2. Authenticate to the application with Administrator credentials and navigate to Admin > Discovery > Crdential Library.

3. Add one SCCM credential with authentication mode as SQL and username as `| calc.exe &` and password for SCCM database server.

4. Navigate to SCCM integration, fill in the required parameters and select the credentials added in `step 3` and schedule a scan.

5. Observe that the application executes `calc.exe` with NT AUTHORITY/SYSTEM privileges.





Solution

-------------------------------------------------

This issue is fixed in ManageEngine AssetExplorer 6.6 version.





Timeline

-------------------------------------------------

15-09-2019 - Reported to vendor

17-09-2019 - Vendor acknowledgement

21-11-2019 - Patch released

13-05-2020 - xen1thLabs public disclosure





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