CVE-2018-0414 : Exploit Details and Defense Strategies

Cisco Secure Access Control Server XML External Entity Injection Vulnerability

Understanding CVE-2018-0414

This CVE involves a vulnerability in the web-based user interface of Cisco Secure Access Control Server, potentially allowing a remote attacker to gain read-only access to specific data on a compromised system.

What is CVE-2018-0414?

The flaw in Cisco Secure Access Control Server arises from the mishandling of XML External Entities (XXEs) during the parsing of an XML file. An attacker, authenticated on the system, could exploit this by convincing the administrator to import a manipulated XML file.

The Impact of CVE-2018-0414

The vulnerability has a CVSS base score of 6.5 (Medium severity).

Technical Details of CVE-2018-0414

Vulnerability Description

Improper handling of XXEs in the parsing process of XML files

Affected Systems and Versions

Product: Cisco Secure Access Control Server Solution Engine (ACSE)
Version: Not applicable

Exploitation Mechanism

Attacker needs to persuade the system administrator to import a carefully manipulated XML file

Mitigation and Prevention

Immediate Steps to Take

Apply the patches provided by Cisco to address the vulnerability
Educate system administrators about the risks of importing untrusted XML files

Long-Term Security Practices

Regularly update and patch all software and systems
Implement network segmentation and access controls to limit exposure

Patching and Updates

Refer to Cisco's security advisory for specific patch details and instructions