CVE-2021-1603 : Security Advisory and Response

This article provides insights into CVE-2021-1603, which reveals critical vulnerabilities in the Cisco Identity Services Engine Software.

Understanding CVE-2021-1603

CVE-2021-1603 pertains to multiple vulnerabilities found in the web-based interface of Cisco Identity Services Engine (ISE) software, potentially enabling a remote attacker to execute a stored cross-site scripting (XSS) attack with administrative credentials.

What is CVE-2021-1603?

The CVE-2021-1603 flaw in Cisco ISE allows an authenticated remote attacker to conduct a stored XSS attack. By injecting malicious code into specific pages of the web-based management interface, the attacker can execute arbitrary script code or access sensitive information.

The Impact of CVE-2021-1603

The impact of this vulnerability is rated as medium severity with a CVSS base score of 4.8. Although the attack complexity is low, the attacker must have high privileges and user interaction is required for exploitation.

Technical Details of CVE-2021-1603

This section delves into the technical aspects of CVE-2021-1603 vulnerability.

Vulnerability Description

The vulnerability stems from inadequate input validation in the web-based management interface, allowing attackers to inject malicious code and execute it in the context of the affected interface.

Affected Systems and Versions

The affected product is the Cisco Identity Services Engine Software with the vulnerability present in all versions.

Exploitation Mechanism

To exploit this vulnerability, an attacker must have valid administrative credentials to inject and execute malicious code into specific pages within the interface.

Mitigation and Prevention

Here are the steps to mitigate the risks associated with CVE-2021-1603.

Immediate Steps to Take

Immediately after discovering this vulnerability, users are advised to restrict access to the web-based management interface and apply vendor-supplied patches.

Long-Term Security Practices

Establish regular security training for administrators and users to recognize and prevent XSS attacks effectively.

Patching and Updates

Regularly monitor vendor security advisories and apply patches promptly to prevent exploitation of known vulnerabilities.