CVE-2021-21313 : Security Advisory and Response

A detailed overview of CVE-2021-21313, a Cross-Site Scripting (XSS) vulnerability in GLPI versions prior to 9.5.4, impacting the /ajax/common.tabs.php endpoint.

Understanding CVE-2021-21313

This section delves into the significance and implications of the CVE-2021-21313 vulnerability in GLPI.

What is CVE-2021-21313?

CVE-2021-21313 is a Cross-Site Scripting (XSS) flaw present in GLPI versions before 9.5.4, specifically within the /ajax/common.tabs.php endpoint. The vulnerability arises due to insufficient sanitization of the

_target

and

id

parameters, leading to potential exploitation.

The Impact of CVE-2021-21313

The XSS vulnerability in GLPI versions earlier than 9.5.4 can result in unauthorized access to confidential information, posing a risk to data integrity, and the execution of arbitrary code.

Technical Details of CVE-2021-21313

Explore the technical specifics associated with the CVE-2021-21313 vulnerability in GLPI.

Vulnerability Description

The vulnerability in /ajax/common.tabs.php allows threat actors to execute malicious scripts by manipulating the _target and id parameters, enabling the injection of harmful payloads.

Affected Systems and Versions

GLPI versions prior to 9.5.4 are affected by CVE-2021-21313, exposing instances to the XSS vulnerability present in the /ajax/common.tabs.php endpoint.

Exploitation Mechanism

Threat actors can leverage the XSS vulnerability in GLPI to execute arbitrary code, compromising data confidentiality and potentially gaining unauthorized access.

Mitigation and Prevention

Discover the essential steps to mitigate and prevent the exploitation of CVE-2021-21313 in GLPI.

Immediate Steps to Take

Users are advised to update their GLPI installation to version 9.5.4 or later to mitigate the XSS vulnerability present in /ajax/common.tabs.php.

Long-Term Security Practices

Implement robust security measures, including input validation and output encoding, to fortify systems against XSS attacks and enhance overall resilience.

Patching and Updates

Regularly monitor for security advisories and promptly apply updates and patches provided by GLPI to address known vulnerabilities and bolster system security.