CVE-2021-4253 : Security Advisory and Response

A vulnerability was discovered in ctrlo lenio's Ticket Handler component, allowing for cross-site scripting by manipulating the argument 'site_id' remotely. The assigned identifier for this vulnerability is VDB-216210.

Understanding CVE-2021-4253

This section will cover what CVE-2021-4253 entails and its potential impact.

What is CVE-2021-4253?

CVE-2021-4253 is a cross-site scripting vulnerability found in the Ticket Handler component of ctrlo lenio, where an unknown function in the library lib/Lenio.pm is affected.

The Impact of CVE-2021-4253

This vulnerability could be exploited remotely by manipulating the 'site_id' parameter, leading to cross-site scripting attacks.

Technical Details of CVE-2021-4253

In this section, we will dive deeper into the specifics of the vulnerability.

Vulnerability Description

The manipulation of the 'site_id' argument in the library lib/Lenio.pm of the Ticket Handler component results in a cross-site scripting vulnerability.

Affected Systems and Versions

The affected component is 'lenio' by ctrlo, with the specific vulnerable version being 'n/a'.

Exploitation Mechanism

By exploiting the improper handling of user input in the 'site_id' parameter, attackers can inject malicious scripts, potentially leading to cross-site scripting attacks.

Mitigation and Prevention

This section focuses on steps to mitigate the risks associated with CVE-2021-4253.

Immediate Steps to Take

It is recommended to apply the provided patch, identified as 7a1f90bd2a0ce95b8338ec0926902da975ec64d9, to address this vulnerability.

Long-Term Security Practices

Implement strict input validation mechanisms and security controls to prevent cross-site scripting attacks in the future.

Patching and Updates

Regularly monitor for security updates and patches released by ctrlo to stay protected against known vulnerabilities.