CVE-2023-26455 : What You Need to Know

This CVE record was published on November 2, 2023, and updated on January 12, 2024, by OX. The vulnerability was identified in the OX App Suite software provided by OX Software GmbH.

Understanding CVE-2023-26455

This CVE relates to a security issue where remote method invocation (RMI) did not require authentication when calling ChronosRMIService:setEventOrganizer. Attackers with local or adjacent network access could exploit this vulnerability to modify calendar items using RMI, even though RMI access is typically restricted to localhost. Fortunately, the interface has been updated to require authenticated requests, and there are currently no known public exploits targeting this vulnerability.

What is CVE-2023-26455?

The vulnerability in question allowed unauthorized users to manipulate calendar items via the RMI service without the need for authentication, potentially compromising the integrity of the software and user data.

The Impact of CVE-2023-26455

The vulnerability's impact is rated as MEDIUM severity with a CVSS v3.1 base score of 5.6. It could result in a high integrity impact as attackers with high privileges could exploit it. However, the attack complexity is rated as LOW, restricting the vector to be local and not involving user interaction.

Technical Details of CVE-2023-26455

The Vulnerability Description, Affected Systems and Versions, and the Exploitation Mechanism are detailed below:

Vulnerability Description

The vulnerability stemmed from improper authentication in the RMI service, specifically when calling ChronosRMIService:setEventOrganizer. This flaw could be abused by attackers with local or adjacent network access to modify calendar items using RMI.

Affected Systems and Versions

The OX App Suite software versions 7.10.6-rev48 and below, as well as version 8.12, were affected by this vulnerability. Users utilizing these versions should take immediate action to mitigate the risk.

Exploitation Mechanism

Attackers with high privileges and local or adjacent network access could exploit this vulnerability to manipulate calendar items through the RMI service without the need for authentication.

Mitigation and Prevention

To address CVE-2023-26455, it is essential to take immediate steps and implement long-term security practices to safeguard system integrity. Patching and updating the affected systems are critical components of preventing potential exploitation.

Immediate Steps to Take

Users should update their OX App Suite to the latest patched version that addresses this vulnerability. Additionally, restricting network access to the RMI service and enforcing proper authentication mechanisms are recommended measures to mitigate the risk.

Long-Term Security Practices

Implementing strict access controls, regular security audits, and employee training on secure coding practices can help prevent similar vulnerabilities in the future.

Patching and Updates

Refer to the OX App Suite release notes and vendor advisories for detailed instructions on patching and updating the software to eliminate the CVE-2023-26455 vulnerability.