CVE-2023-40703 : Security Advisory and Response
Discover CVE-2023-40703, a vulnerability in Mattermost Boards allowing attackers to trigger Denial of Service attacks by exploiting character limitations in block fields. Learn about the impact, affected systems, and mitigation strategies.
A detailed overview of CVE-2023-40703, a vulnerability in Mattermost that could lead to Denial of Service attacks.
Understanding CVE-2023-40703
This section delves into the impact, technical details, and mitigation strategies for CVE-2023-40703.
What is CVE-2023-40703?
CVE-2023-40703 is a vulnerability in Mattermost Boards that allows an attacker to consume excessive resources, potentially leading to Denial of Service, by patching the field of a block using a specially crafted string.
The Impact of CVE-2023-40703
The vulnerability's impact is considered medium with a CVSS base score of 4.3. It poses a low attack complexity and can be exploited over a network without user interaction, affecting the availability of the system.
Technical Details of CVE-2023-40703
Learn about the vulnerability description, affected systems, and exploitation mechanism associated with CVE-2023-40703.
Vulnerability Description
Mattermost fails to restrict the characters allowed in different fields of a block in Mattermost Boards, enabling an attacker to trigger a Denial of Service attack.
Affected Systems and Versions
Versions up to 9.1.0 of Mattermost are affected by this vulnerability, while versions 9.1.1, 9.0.2, 7.8.13, and 8.1.4 or higher are not susceptible.
Exploitation Mechanism
By exploiting the lack of character restrictions in specific block fields, an attacker can overwhelm the system, leading to resource exhaustion and potential service disruption.
Mitigation and Prevention
Discover the immediate steps and long-term security practices to safeguard against CVE-2023-40703.
Immediate Steps to Take
Users are advised to update Mattermost Server to versions 9.1.1, 9.0.2, 7.8.13, 8.1.4 or higher to mitigate the risk of exploitation.
Long-Term Security Practices
Implement secure coding practices, conduct regular security assessments, and stay informed about the latest updates and patches for Mattermost to enhance overall system security.
Patching and Updates
Regularly monitor security advisories and apply patches promptly to address known vulnerabilities and prevent potential exploitation.