CVE-2023-20105 : What You Need to Know

This CVE-2023-20105 pertains to a vulnerability found in the change password functionality of Cisco Expressway Series and Cisco TelePresence Video Communication Server (VCS). The issue could potentially allow an authenticated, remote attacker with Read-only credentials to escalate their privileges to Administrator on the affected system.

Understanding CVE-2023-20105

This section delves into the details of CVE-2023-20105 and its implications.

What is CVE-2023-20105?

The vulnerability in CVE-2023-20105 is a result of incorrect handling of password change requests within Cisco Expressway Series and Cisco TelePresence Video Communication Server (VCS). An attacker could exploit this flaw by using Read-only user credentials to send a specially crafted request to the web-based management interface. If successful, the attacker could manipulate user passwords, including those of administrative users, enabling impersonation of those users.

The Impact of CVE-2023-20105

The impact of CVE-2023-20105 is deemed critical with a CVSS base score of 9.6 out of 10, indicating a high severity level. The attacker can gain elevated privileges on the system, compromising its integrity and availability. However, there have been no reported instances of public exploitation of this vulnerability.

Technical Details of CVE-2023-20105

This section provides a deeper look into the technical aspects of CVE-2023-20105, including how the vulnerability manifests.

Vulnerability Description

The vulnerability arises from the mishandling of password change requests, specifically within Cisco Expressway Series and Cisco TelePresence Video Communication Server (VCS). Improper authentication mechanisms allow attackers to escalate their privileges by altering user passwords.

Affected Systems and Versions

Multiple versions of Cisco TelePresence Video Communication Server (VCS) Expressway are impacted by this vulnerability, spanning X8.1 to X12.7. The identified affected versions allow for potential exploitation of the privilege escalation issue.

Exploitation Mechanism

Exploiting this vulnerability involves authenticating as a Read-only user and sending a crafted request to the web-based management interface. By manipulating password change requests, the attacker can raise their privileges to the Administrator level.

Mitigation and Prevention

To mitigate the risks associated with CVE-2023-20105, several countermeasures can be implemented.

Immediate Steps to Take

It is crucial to apply security patches and updates provided by Cisco to address the vulnerability promptly. Additionally, restricting access to the affected systems and closely monitoring user actions can help prevent unauthorized privilege escalation attempts.

Long-Term Security Practices

Implementing strong password policies, enforcing multi-factor authentication, and conducting regular security audits can enhance the overall security posture of the system. Educating users about phishing tactics and social engineering schemes can also bolster the defense against potential attacks.

Patching and Updates

Regularly checking for security advisories from Cisco and promptly applying patches can prevent exploitation of known vulnerabilities. Staying proactive in keeping systems up-to-date is essential in safeguarding against emerging threats.