CVE-2023-26435 : What You Need to Know

This CVE record was published on June 20, 2023, with a base CVSS score of 5, indicating a medium severity level. The vulnerability was identified in the OX App Suite software, developed by OX Software GmbH, affecting versions up to 7.10.6-rev7. Attackers could exploit this vulnerability through manipulated ODT documents to access filesystem and network references from the local LibreOffice instance, potentially gaining insights into restricted network topology and services. However, there are currently no known public exploits for this vulnerability.

Understanding CVE-2023-26435

This section provides detailed insights into the nature and impact of CVE-2023-26435.

What is CVE-2023-26435?

The CVE-2023-26435 vulnerability allowed attackers to leverage manipulated ODT documents to access filesystem and network references from the local LibreOffice instance. By exploiting this flaw, threat actors could potentially discover restricted network topology and services, as well as include local files with read permissions of the open-xchange system user. The vulnerability was limited to specific file types, such as images.

The Impact of CVE-2023-26435

The impact of CVE-2023-26435 was classified as medium severity, with a CVSS base score of 5. While the attack complexity was assessed as low, the confidentiality impact was low, and the integrity impact was none. With limited privileges required and no user interaction, the scope of the vulnerability was changed, posing a risk to affected systems.

Technical Details of CVE-2023-26435

In this section, we delve into the vulnerability description, affected systems and versions, as well as the exploitation mechanism of CVE-2023-26435.

Vulnerability Description

The vulnerability in question stemmed from a flaw that allowed for server-side request forgery (SSRF) attacks using manipulated ODT documents. Attackers could manipulate these documents to access local filesystem and network resources, potentially compromising the confidentiality of restricted information.

Affected Systems and Versions

The OX App Suite software, specifically versions up to 7.10.6-rev7, developed by OX Software GmbH, was susceptible to the CVE-2023-26435 vulnerability. Users of these versions were at risk of exploitation through malicious ODT documents.

Exploitation Mechanism

Exploiting CVE-2023-26435 involved crafting manipulated ODT documents to trigger the SSRF vulnerability present in the OX App Suite software. By enticing a user to open such a malicious document, attackers could gain unauthorized access to filesystem and network references within the local LibreOffice instance.

Mitigation and Prevention

To secure systems against CVE-2023-26435, it is essential to follow immediate steps, adopt long-term security practices, and implement relevant patches and updates.

Immediate Steps to Take

Users are advised to exercise caution while opening ODT documents from untrusted sources and ensure that content filters are updated to mitigate the risk of SSRF attacks. It is crucial to stay informed about security advisories related to the OX App Suite software.

Long-Term Security Practices

In the long term, organizations should prioritize security awareness training for employees to recognize and report suspicious file attachments. Regular security audits and penetration testing can help identify and address vulnerabilities proactively.

Patching and Updates

It is recommended to apply patches and updates released by OX Software GmbH promptly. Keeping the software up to date with the latest security enhancements and fixes can prevent exploitation of known vulnerabilities like CVE-2023-26435.