CVE-2023-46245 : What You Need to Know

Kimai (Authenticated) SSTI to RCE by Uploading a Malicious Twig File.

Understanding CVE-2023-46245

Kimai, a web-based multi-user time-tracking application, has a vulnerability in versions prior to 2.1.0 that allows Server-Side Template Injection (SSTI) leading to Remote Code Execution (RCE) when a malicious user uploads a specially crafted Twig file.

What is CVE-2023-46245?

CVE-2023-46245 is a vulnerability in Kimai versions prior to 2.1.0 that enables an attacker to upload a malicious Twig file, exploiting SSTI to achieve RCE on the affected system. This can result in unauthorized access and potential manipulation of data.

The Impact of CVE-2023-46245

The impact of this vulnerability is rated as HIGH, with a CVSS v3.1 base score of 7.2. It affects confidentiality, integrity, and availability, requiring high privileges to exploit. The attack complexity is low, making it easier for threat actors to carry out an attack.

Technical Details of CVE-2023-46245

The following technical details provide insight into the vulnerability and its implications.

Vulnerability Description

The vulnerability arises due to improper neutralization of special elements used in a template engine, specifically Twig files in Kimai. This flaw can be abused by attackers to execute arbitrary code on the server, compromising its security.

Affected Systems and Versions

Kimai versions prior to 2.1.0 are affected by this vulnerability. Users with versions below this are at risk of exploitation by uploading malicious Twig files, potentially leading to RCE.

Exploitation Mechanism

Exploiting this vulnerability involves uploading a specially crafted Twig file to the application, leveraging the SSTI to execute malicious code. Attackers can use this technique to take control of the server remotely.

Mitigation and Prevention

To address CVE-2023-46245 and protect systems from exploitation, consider the following mitigation strategies.

Immediate Steps to Take

Update Kimai to version 2.1.0 or higher to mitigate the vulnerability and prevent SSTI to RCE escalation through Twig files.

Long-Term Security Practices

Regularly monitor security advisories and update Kimai promptly to patch any future vulnerabilities that may arise.

Patching and Updates

Stay informed about security patches and updates released by Kimai developers to ensure the ongoing security of the application.