CVE-2023-20104 : Exploit Details and Defense Strategies

This CVE record involves a vulnerability in the file upload functionality of Cisco Webex App for Web that could potentially lead to a cross-site scripting (XSS) attack. The issue could be exploited by an unauthenticated, remote attacker to execute arbitrary script code or access sensitive information within the affected interface.

Understanding CVE-2023-20104

This section will delve into the details of the CVE-2023-20104 vulnerability, its impact, technical description, affected systems, exploitation mechanism, and mitigation strategies.

What is CVE-2023-20104?

The CVE-2023-20104 vulnerability resides in the file upload feature of Cisco Webex App for Web. Insufficient validation of user-supplied input allows an attacker to send a malicious file to a user, tricking them into visiting a specific URL. This action enables the attacker to execute arbitrary script code in the context of the affected interface.

The Impact of CVE-2023-20104

The impact of this vulnerability is categorized as MEDIUM with a base score of 6.1. Although the confidentiality and integrity impacts are assessed as low, the potential execution of arbitrary script code poses a significant risk to affected systems.

Technical Details of CVE-2023-20104

In this section, we will discuss the vulnerability description, affected systems, and versions, as well as the exploitation mechanism associated with CVE-2023-20104.

Vulnerability Description

The vulnerability arises from insufficient validation of user-supplied input in the file upload functionality of Cisco Webex App for Web, paving the way for a cross-site scripting attack.

Affected Systems and Versions

The vulnerability affects Cisco Webex Teams, with the specific version details marked as 'n/a' and confirmed as 'affected'.

Exploitation Mechanism

An attacker can exploit this vulnerability by sending a crafted file to a user, convincing them to access a specific URL. This action allows the attacker to execute malicious script code within the affected interface.

Mitigation and Prevention

To address CVE-2023-20104, organizations and users can undertake immediate steps to safeguard their systems, implement long-term security practices, and apply necessary patches and updates.

Immediate Steps to Take

Organizations should educate users on the risks associated with opening files from unknown sources.
Users should refrain from accessing suspicious URLs or downloading files from untrusted sites.
Implement security tools that can detect and prevent XSS attacks.

Long-Term Security Practices

Regular security training and awareness programs for employees.
Continuous monitoring of network traffic for any suspicious activities.
Implementing a robust web application firewall to filter and block potentially malicious traffic.

Patching and Updates

Stay informed about security advisories and updates from Cisco regarding CVE-2023-20104.
Apply patches and updates provided by the vendor promptly to mitigate the vulnerability and enhance the security posture of the system.