CVE-2023-26430 : What You Need to Know

This CVE record was published on August 2, 2023, and updated on January 12, 2024, by OX Software GmbH.

Understanding CVE-2023-26430

This CVE describes a vulnerability in OX App Suite that allows attackers with access to user accounts to inject arbitrary control characters to SIEVE mail-filter rules. This could potentially grant unauthorized access to SIEVE extensions not allowed by App Suite or disrupt per-user filter processing, necessitating manual cleanup of affected rules.

What is CVE-2023-26430?

The vulnerability in question enables attackers to manipulate SIEVE mail-filter rules by injecting control characters, potentially compromising the integrity and security of the filtering system within OX App Suite.

The Impact of CVE-2023-26430

This vulnerability poses a low-severity risk, with a CVSS base score of 3.5. While no publicly available exploits are currently known, the potential for unauthorized access and disruption of filter processing could lead to security implications for affected systems.

Technical Details of CVE-2023-26430

The vulnerability is classified under CWE-77 - Improper Neutralization of Special Elements used in a Command ('Command Injection'). It has a CVSSv3.1 base score of 3.5, indicating a low severity level with a high attack complexity and network-based attack vector.

Vulnerability Description

Attackers can exploit this vulnerability by injecting control characters into SIEVE mail-filter rules, allowing them to bypass security restrictions and potentially disrupt email filtering processes.

Affected Systems and Versions

The vulnerability affects OX App Suite versions 7.10.6-rev42 and below, as well as version 8.10.

Exploitation Mechanism

Attackers with access to user accounts can abuse the vulnerability to manipulate SIEVE mail-filter rules, potentially compromising the integrity and functionality of the filtering system.

Mitigation and Prevention

To mitigate the risks associated with CVE-2023-26430, immediate steps should be taken to secure affected systems and prevent potential exploitation.

Immediate Steps to Take

Organizations using affected versions of OX App Suite should update to the latest patched versions to eliminate the vulnerability.
Implement access controls and monitoring mechanisms to detect and prevent unauthorized access to user accounts.

Long-Term Security Practices

Regularly monitor and audit mail-filter rule configurations to detect any unauthorized changes.
Train users on best practices for email security and encourage reporting of any suspicious activities related to email filtering.

Patching and Updates

Refer to the release notes provided by OX Software GmbH for Patch Release 6230 to stay informed about security patches and updates addressing CVE-2023-26430. Collaborate closely with the vendor to ensure timely application of patches and maintenance of system security.