CVE-2017-5258 : Security Advisory and Response

In December 2017, Cambium Networks ePMP firmware versions prior to 3.5 were found to have a vulnerability allowing attackers to inject XSS strings into configuration files.

Understanding CVE-2017-5258

What is CVE-2017-5258?

Prior to version 3.5 of Cambium Networks ePMP firmware, an attacker with knowledge of the RW community string could inject XSS strings into configuration files via specific SNMP OIDs.

The Impact of CVE-2017-5258

This vulnerability could lead to unauthorized configuration changes on affected devices, potentially compromising their security.

Technical Details of CVE-2017-5258

Vulnerability Description

Attackers could exploit specific SNMP OIDs to inject XSS strings into configuration files, leading to unauthorized configuration changes.

Affected Systems and Versions

Product: ePMP
Vendor: Cambium Networks
Versions affected: 3.5 and prior

Exploitation Mechanism

By manipulating configuration files with XSS strings and serving them via HTTP, attackers could trick devices into restoring configurations using the malicious files.

Mitigation and Prevention

Immediate Steps to Take

Upgrade to version 3.5 or newer of Cambium Networks ePMP firmware.
Restrict access to SNMP services and community strings.

Long-Term Security Practices

Regularly monitor and audit SNMP configurations.
Implement network segmentation to limit the impact of potential attacks.

Patching and Updates

Apply security patches and updates provided by Cambium Networks to address this vulnerability.