CVE-2021-21314 : Exploit Details and Defense Strategies

GLPI, an open-source asset and IT management software, version < 9.5.4, is susceptible to a Cross-Site Scripting (XSS) vulnerability when updating a ticket.

Understanding CVE-2021-21314

This CVE, also known as 'XSS injection on ticket update,' impacts GLPI software versions below 9.5.4, allowing an attacker to execute arbitrary scripts in a victim's web browser.

What is CVE-2021-21314?

CVE-2021-21314 is a security flaw in GLPI software, enabling an attacker to inject malicious scripts through a logged-in user during ticket updates.

The Impact of CVE-2021-21314

The vulnerability poses a medium risk, with a CVSS base score of 5.4. It requires high privileges and user interaction but does not affect confidentiality. However, it can lead to the compromise of data integrity.

Technical Details of CVE-2021-21314

GLPI's XSS vulnerability involves a high attack complexity via a network vector. The integrity impact is high, while no availability impact is noted. User interaction is required, and scope is changed.

Vulnerability Description

The vulnerability, with the ID CWE-79, allows for improper neutralization of input during web page generation, leading to XSS attacks on GLPI.

Affected Systems and Versions

GLPI software versions prior to 9.5.4 are affected by this XSS vulnerability, potentially impacting users who update tickets within the system.

Exploitation Mechanism

By exploiting this vulnerability, an attacker can input malicious scripts via a logged-in user, triggering XSS attacks during the ticket update process.

Mitigation and Prevention

To secure systems from CVE-2021-21314, immediate steps include updating GLPI to version 9.5.4. Long-term security practices should focus on regular patching and timely software updates.

Immediate Steps to Take

Immediately update GLPI software to version 9.5.4 to mitigate the XSS vulnerability present in earlier versions.

Long-Term Security Practices

Implement robust security measures, including user training, access controls, and security assessments, to prevent future XSS vulnerabilities.

Patching and Updates

Regularly monitor for software patches and updates to stay protected against emerging security threats.