CVE-2017-3852 : Vulnerability Insights and Analysis

A vulnerability in the Cisco application-hosting framework (CAF) component of the Cisco IOx application environment could allow an authenticated, remote attacker to write or modify arbitrary files in the virtual instance running on the affected device. The vulnerability arises from insufficient input validation of user-supplied application packages.

Understanding CVE-2017-3852

This CVE involves a flaw in the Cisco IOx application environment's Cisco application-hosting framework (CAF) component, potentially exploitable by an authorized remote attacker to alter or create arbitrary files within the virtual instance running on the affected device.

What is CVE-2017-3852?

The vulnerability allows attackers to upload malicious packages into Cisco IOx, enabling them to modify files within the virtual instance. However, the impact is limited to the virtual instance and does not affect the hosting router running Cisco IOx.

The Impact of CVE-2017-3852

An authenticated remote attacker could write or modify arbitrary files in the virtual instance on the affected device.
Successful exploitation is confined to the virtual instance and does not impact the hosting router.

Technical Details of CVE-2017-3852

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability is a CWE-20 Arbitrary File Creation Vulnerability within the Cisco application-hosting framework (CAF) component of the Cisco IOx application environment.

Affected Systems and Versions

Vulnerable versions include Cisco IOx Releases 1.0.0.0 and 1.1.0.0.
The corresponding Cisco Bug ID for this issue is CSCuy52317.

Exploitation Mechanism

Attackers exploit the vulnerability by uploading malicious packages into Cisco IOx.
Insufficient input validation of user-supplied application packages allows attackers to modify arbitrary files.

Mitigation and Prevention

Protecting systems from CVE-2017-3852 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply security patches provided by Cisco promptly.
Monitor and restrict access to the affected device.
Educate users on safe application package handling.

Long-Term Security Practices

Implement robust input validation mechanisms for user-supplied packages.
Regularly update and patch software to prevent vulnerabilities.

Patching and Updates

Stay informed about security advisories from Cisco.
Regularly check for updates and apply patches to mitigate risks.