This vulnerability allows Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, and 10.1.x <= 10.1.3 to improperly handle posts with attachments containing fields that cannot be cast to a String. Attackers may leverage this flaw to crash the web application by creating and sending such posts to a channel. The CVSS score for this vulnerability is 6.5, categorized as medium severity, which indicates a significant risk to organizations.
Risk to organizations includes potential downtime and disruption of services, which could result in loss of productivity and operational efficiency. The vulnerability was published on January 16, 2025, and the urgency for defenders to address it is classified as medium. Organizations should incorporate this into their patch management cycle to mitigate potential impacts.
Currently, there are no known public exploits or proof of concept for this vulnerability. However, organizations should remain vigilant and monitor for any updates or advisories from Mattermost regarding this issue. Immediate patching and remediation are advised, especially since the vulnerability affects multiple versions of Mattermost Server.
Organizations should prioritize patching immediately. This proactive measure will help safeguard against potential exploitation and ensure the stability of the Mattermost Server environment.
Vulnerability Details
The official CVE description states that Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, and 10.1.x <= 10.1.3 fail to properly handle posts with attachments containing fields that cannot be cast to a String. This vulnerability is classified under CWE-1287.
The CVSS score of 6.5 indicates a medium severity level. The attack vector is network-based, with a low attack complexity and low privileges required. User interaction is not needed, and the impact on availability is high, meaning that it could lead to significant service disruption.
Technical Analysis
The root cause of this vulnerability lies in the improper handling of attachment fields during the post creation process. The attack vector is network-based, meaning that an attacker can exploit this vulnerability remotely. The attack complexity is low, allowing even low-skilled attackers to potentially exploit this flaw.
No user interaction is required to exploit this vulnerability, which increases the risk to organizations. The confidentiality and integrity impacts are negligible, but the availability impact is high, as it could lead to crashes of the web application. This vulnerability highlights the importance of input validation and error handling in web applications.
Risk & Impact Analysis
Real-world deployment of Mattermost with this vulnerability could expose organizations to service disruptions. The potential blast radius includes all users interacting with the affected Mattermost channels. The urgency assessment based on the CVSS score indicates that organizations should address this vulnerability in their priority patch cycle.
Organizations should consider the operational impact of this vulnerability, including potential downtime and the effects on productivity. The lack of known public exploits does not diminish the risk, as attackers may still leverage this vulnerability in targeted attacks.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerable versions of Mattermost Server are as follows:
Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, and 10.1.x <= 10.1.3. Organizations running these versions should prioritize updates to secure their systems.
Mitigation & Remediation
Organizations should promptly patch affected Mattermost versions to mitigate this vulnerability. The recommended action is to upgrade to the latest version of Mattermost Server.
In case an immediate update is not feasible, organizations should implement workarounds by restricting the posting of attachments or reviewing input validation mechanisms. Additionally, regular monitoring for unusual application behavior can help detect potential exploitation attempts.
Continuous penetration testing should be considered to validate the effectiveness of the implemented security measures.
Detection Guidance
Organizations should monitor logs for indicators of exploitation attempts, such as unusual post creations or abnormal application crashes. Behavioral anomalies in user interactions with the Mattermost application should also be scrutinized.
AppSecure Threat Intelligence Insight
This vulnerability highlights a critical area in application security, particularly around input validation and error handling. Organizations should take this as an opportunity to review their development practices to ensure such vulnerabilities are not introduced in the future.
Patterns of vulnerabilities in application software often emerge from similar issues, suggesting a need for continuous security education and awareness among development teams. Implementing secure coding practices can help mitigate risks associated with input handling.
Penetration testing methodology and understanding security principles should be integrated into the development lifecycle to foster a security-first mindset.
A robust vulnerability management program will ensure timely identification and remediation of vulnerabilities, thereby minimizing the attack surface.
Implementing API security best practices can further enhance the security posture of applications like Mattermost, especially as they handle user-generated content.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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