CVE-2021-36091 Explained : Impact and Mitigation

Agents are able to list appointments in the calendars without required permissions. This security issue affects OTRS AG ((OTRS)) Community Edition version 6.0.1 and later, as well as OTRS version 7.0.x prior to 7.0.27.

Understanding CVE-2021-36091

This CVE describes a vulnerability that allows unauthorized access to calendar appointments in OTRS, potentially exposing sensitive information.

What is CVE-2021-36091?

CVE-2021-36091 refers to the ability of agents to view calendar appointments without the necessary permissions in OTRS, compromising the confidentiality of appointment details.

The Impact of CVE-2021-36091

The impact of this vulnerability is low, with a CVSS base score of 3.5, posing a risk of unauthorized access to calendar information stored in OTRS Community Edition and OTRS.

Technical Details of CVE-2021-36091

This section outlines the vulnerability description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

Agents can access calendar appointments in OTRS without the required permissions, potentially leading to unauthorized exposure of sensitive information.

Affected Systems and Versions

OTRS AG ((OTRS)) Community Edition: 6.0.1 and later versions
OTRS AG OTRS: 7.0.x versions prior to 7.0.27

Exploitation Mechanism

The vulnerability allows agents with low privileges to list appointments in the calendars, posing a risk of information exposure.

Mitigation and Prevention

In order to mitigate the risks associated with CVE-2021-36091, immediate steps and long-term security practices should be followed.

Immediate Steps to Take

Users are advised to update to OTRS 7.0.28 to address the unauthorized access to calendar appointments vulnerability.

Long-Term Security Practices

Regularly review and adjust permissions to restrict access to sensitive calendar information in OTRS instances.

Patching and Updates

Stay informed about security advisories and apply timely patches and updates to ensure the security of OTRS installations.