CVE-2026-24936 is a critical vulnerability affecting the Asustor Data Master. When a specific function is enabled while joining an Active Directory domain from ADM, an improper input parameters validation vulnerability in a CGI program allows unauthenticated remote attackers to write arbitrary data to any file on the system. This could lead to the overwriting of critical system files, resulting in complete system compromise. Organizations utilizing affected versions must take action.
The severity of this vulnerability is classified as critical, with a CVSS score of 9.5. This high score underscores the significant risk to organizations, as it indicates an easily exploitable attack vector with low complexity. Organizations must understand the potential impact on their systems and the urgency of addressing this issue.
Currently, there are no known public exploits for this vulnerability. However, the potential for exploitation remains high, and attackers may leverage this vulnerability to gain unauthorized access and control over affected systems. Organizations should prioritize patching immediately to prevent any possible breaches.
Asustor has detailed affected products and versions, including from ADM 4.1.0 through ADM 4.3.3.ROF1 and from ADM 5.0.0 through ADM 5.1.1.RCI1. Organizations that have deployed these versions are strongly advised to take immediate remediation steps.
Vulnerability Details
The vulnerability identified as CVE-2026-24936 allows unauthenticated remote attackers to write arbitrary data to any file on the system due to improper input parameter validation in a specific CGI program when joining an Active Directory domain from ADM. This can lead to the overwriting of critical system files, causing a complete system compromise.
The CVSS score for this vulnerability is 9.5, classified as critical. This indicates a significant risk for organizations, as the impact on confidentiality, integrity, and availability is rated as high. The vulnerability affects versions from ADM 4.1.0 to 4.3.3.ROF1 and from ADM 5.0.0 to 5.1.1.RCI1.
The official CWE classification for this vulnerability is CWE-20, which refers to improper input validation. Organizations should be aware of the potential risks and vulnerabilities in their systems.
Technical Analysis
The root cause of CVE-2026-24936 stems from improper input parameter validation in a CGI program. This vulnerability can be exploited through the network without requiring any authentication, making it particularly dangerous. The attack complexity is low, meaning that an attacker can easily exploit this vulnerability without sophisticated techniques.
No privileges are required to exploit this vulnerability, and user interaction is not necessary. As a result, the confidentiality, integrity, and availability impacts are rated as high, indicating that successful exploitation could lead to unauthorized data access, modification of system files, and significant disruptions to service.
Risk & Impact Analysis
The risk associated with CVE-2026-24936 is substantial, particularly for organizations using the affected versions of Asustor Data Master. The vulnerability can lead to a complete system compromise, resulting in significant operational and reputational damage. Attackers may exploit this vulnerability to overwrite critical system files, leading to data loss and service disruptions.
Organizations must assess the impact of this vulnerability on their systems and prioritize remediation efforts accordingly. The urgency for addressing this vulnerability is critical, given the high CVSS score and potential for exploitation. Organizations should implement immediate patches and updates as part of their security protocols.
Given the nature of the vulnerability and the potential for significant impacts, it is advisable for organizations to regularly review their security measures and configurations to mitigate risks associated with similar vulnerabilities in the future.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of Asustor Data Master include all versions from ADM 4.1.0 through ADM 4.3.3.ROF1 and from ADM 5.0.0 through ADM 5.1.1.RCI1. Organizations should ensure that they are not running these versions to mitigate potential risks.
Mitigation & Remediation
Organizations should prioritize immediate patching of the affected versions of Asustor Data Master. Ensure that the systems are updated to the latest versions provided by Asustor to mitigate the risk associated with CVE-2026-24936.
If patches are not available, organizations should consider implementing workarounds, such as disabling the specific function that enables the vulnerability when joining an AD Domain. Additionally, configuration hardening should be reviewed to eliminate unnecessary services that could expose the system to this risk.
Regular monitoring and logging should be established to detect any unauthorized access attempts or anomalies in system behavior. For further assistance in validating security measures, organizations can utilize penetration testing services.
Detection Guidance
To detect potential exploitation attempts of CVE-2026-24936, organizations should monitor logs for unusual file access patterns, especially in sensitive areas of the filesystem. Behavioral anomalies such as unexpected modifications to configuration files should also be flagged for review.
Network signatures should be established to detect unauthorized access attempts related to the vulnerability. Regular audits of system changes can help identify unauthorized alterations that may indicate exploitation attempts.
AppSecure Threat Intelligence Insight
CVE-2026-24936 represents a significant threat to organizations utilizing Asustor Data Master. The vulnerability's exploitation could lead to severe consequences, highlighting the need for robust security measures. This incident serves as a reminder of the importance of thorough input validation and the necessity of regular security assessments.
Organizations should draw lessons from this vulnerability to enhance their security posture. Implementing comprehensive vulnerability management programs can help identify and mitigate similar risks in the future.
Additionally, adopting a proactive approach to security through regular penetration testing can significantly improve an organization's ability to detect vulnerabilities before they can be exploited.
Finally, organizations should ensure that they are prepared to respond effectively to any incidents that may arise from vulnerabilities like CVE-2026-24936. Implementing a robust incident response plan and conducting regular drills can enhance preparedness and resilience.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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