CVE-2017-3851 Explained : Impact and Mitigation

Cisco IOx application environment, specifically its web framework code in the Cisco application-hosting framework (CAF) component, contains a security flaw known as a Directory Traversal vulnerability. This vulnerability allows an attacker who is not authenticated and located remotely to gain unauthorized access to any file within the CAF present in the virtual instance running on the affected device. The root cause of this vulnerability is the inadequate validation of user input. Exploiting this vulnerability involves the attacker sending manipulated requests to the CAF web interface. It is essential to note that the impact of a successful exploitation is confined within the virtual instance and does not affect the hosting router of Cisco IOx. The vulnerable versions of Cisco IOx are Releases 1.0.0.0 and 1.1.0.0. This security issue is tracked by Cisco Bug IDs: CSCuy52302.

Understanding CVE-2017-3851

Cisco IOx application environment is affected by a Directory Traversal vulnerability in the web framework code of the Cisco application-hosting framework (CAF) component.

What is CVE-2017-3851?

A Directory Traversal vulnerability in the web framework code of the Cisco application-hosting framework (CAF) component of the Cisco IOx application environment.
Allows an unauthenticated, remote attacker to read any file from the CAF in the virtual instance running on the affected device.

The Impact of CVE-2017-3851

Unauthorized access to files within the CAF in the virtual instance on the affected device.
Limited to the scope of the virtual instance and does not impact the hosting router of Cisco IOx.

Technical Details of CVE-2017-3851

Cisco IOx application environment is affected by a Directory Traversal vulnerability in the web framework code of the Cisco application-hosting framework (CAF) component.

Vulnerability Description

Directory Traversal vulnerability in the web framework code of the Cisco application-hosting framework (CAF) component.
Allows an unauthenticated, remote attacker to read any file from the CAF in the virtual instance running on the affected device.

Affected Systems and Versions

Vulnerable versions: Releases 1.0.0.0 and 1.1.0.0 of Cisco IOx.

Exploitation Mechanism

Attacker sends manipulated requests to the CAF web interface to exploit the vulnerability.

Mitigation and Prevention

Cisco provides guidance on mitigating and preventing the CVE-2017-3851 vulnerability.

Immediate Steps to Take

Apply the necessary security patches provided by Cisco.
Monitor network traffic for any signs of exploitation.

Long-Term Security Practices

Regularly update and patch all software and firmware.
Implement strong authentication mechanisms and access controls.

Patching and Updates

Ensure all affected systems are updated with the latest patches from Cisco.