Netgear Management System NMS300 contains arbitrary file upload and path traversal vulnerabilities

Overview

Netgear Management System NMS300, version 1.5.0.11 and earlier, is vulnerable to arbitrary file upload, which may be leveraged by unauthenticated users to execute arbitrary code with SYSTEM privileges. A directory traversal vulnerability enables authenticated users to download arbitrary files.

Description

Netgear Management System NMS300 is a configuration, monitoring, and diagnostics utility for managing SNMP networked devices via a web interface.

CWE-434: Unrestricted Upload of File with Dangerous Type - CVE-2016-1524

Default installations of NMS300 operate two Java servlets, http://<IP>:8080/fileUpload.do and http://<IP>:8080/lib-1.0/external/flash/fileUpload.do, that can be accessed by unauthenticated users. By sending a specially crafted POST request to the servlets, an attacker can upload arbitrary files that will then be accessible from the NMS300 server’s root directory as http://<IP>:8080/``null<filename>. The NMS300 server runs with SYSTEM privileges.

CWE-22: Improper Limitation of a Pathname to a Restricted Directory (‘Path Traversal’) - CVE-2016-1525

NMS300 contains a directory traversal vulnerability. An authenticated attacker can manipulate the realName parameter of a crafted POST request sent to http://<IP>:8080/data/config/image.do?method=add to load an arbitrary local file from the server host to a predictable location in the web service. The file can then be downloaded from http://<IP>:8080/data/config/image.do?method=``export&imageId=<ID>, where <ID> is a count that increments by one every time a file is uploaded in this manner.

For more information, refer to Pedro Ribeiro’s disclosure. The CVSS score describes CVE-2016-1524.

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Impact

An unauthenticated attacker on the network can upload arbitrary files to the server’s root web directory, leading to data creation and arbitrary code execution with SYSTEM privileges. An authenticated attacker on the network can access any file on the server host.

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Solution

The CERT/CC is currently unaware of a practical solution to this problem and recommends the following workaround.

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Restrict access

Enable firewall rules to restrict untrusted sources from accessing the web management interface.

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Vendor Information

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Netgear, Inc. Affected

Notified: December 04, 2015 Updated: January 25, 2016

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

CVSS Metrics

Group	Score	Vector
Base	8.3	AV:A/AC:L/Au:N/C:C/I:C/A:C
Temporal	7.5	E:POC/RL:U/RC:C
Environmental	5.6	CDP:ND/TD:M/CR:ND/IR:ND/AR:ND

References

• <http://downloadcenter.netgear.com/en/product/NMS300#&gt;
• <https://cwe.mitre.org/data/definitions/434.html&gt;
• <https://cwe.mitre.org/data/definitions/22.html&gt;
• <http://seclists.org/fulldisclosure/2016/Feb/30&gt;

Acknowledgements

Thanks to Pedro Ribeiro ([email protected]) of Agile Information Security for reporting this vulnerability.

This document was written by Joel Land.

Other Information

CVE IDs:	CVE-2016-1524, CVE-2016-1525
Date Public:	2016-02-03 Date First Published: