CVE-2020-3256 Explained : Impact and Mitigation

A vulnerability in the web-based management interface of Cisco Hosted Collaboration Mediation Fulfillment (HCM-F) Software could allow an authenticated, remote attacker to gain read access to information stored on an affected system. The vulnerability is due to improper handling of XML External Entity (XXE) entries when parsing certain XML files.

Understanding CVE-2020-3256

This CVE refers to a security flaw in Cisco Hosted Collaboration Mediation Fulfillment (HCM-F) Software that could be exploited by an attacker to access sensitive information.

What is CVE-2020-3256?

The vulnerability in Cisco HCM-F Software allows an authenticated remote attacker to read information on the system by exploiting XML External Entity (XXE) entries.

The Impact of CVE-2020-3256

An attacker with administrative privileges can access sensitive data on the affected system.
Successful exploitation could lead to the disclosure of confidential information.

Technical Details of CVE-2020-3256

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability arises from the mishandling of XXE entries in XML files, enabling attackers to send malicious requests to retrieve files from the local system.

Affected Systems and Versions

Product: Cisco Hosted Collaboration Mediation Fulfillment
Vendor: Cisco
Version: n/a

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Privileges Required: High
Confidentiality Impact: High
Integrity Impact: None
User Interaction: None

Mitigation and Prevention

Protecting systems from CVE-2020-3256 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor-provided patches or updates promptly.
Restrict network access to the management interface of the affected software.
Monitor for any unauthorized access or unusual activities.

Long-Term Security Practices

Regularly update and patch software to address known vulnerabilities.
Conduct security training for staff to recognize and respond to potential threats.
Implement access controls and least privilege principles to limit exposure.
Utilize intrusion detection systems to identify suspicious activities.

Patching and Updates

Stay informed about security advisories from Cisco and apply relevant patches.
Regularly check for software updates and security bulletins to ensure system protection.