A vulnerability has been found in D-Link DIR-823X firmware versions 240126 and 240802, classified as high severity. This vulnerability allows for a null pointer dereference, which can be exploited remotely, potentially leading to service disruptions. With a CVSS score of 8.7, this vulnerability poses a significant risk to the availability of affected devices.
Published on January 15, 2025, and analyzed by various security experts, this vulnerability has been disclosed to the public, increasing the urgency for organizations to address it. The impact on availability is rated as high, which means that successful exploitation can lead to complete unavailability of the affected system.
Given the nature of the vulnerability, where no authentication is required and no user interaction is needed, organizations must prioritize patching immediately. Attackers may leverage this vulnerability to disrupt services, making it critical for organizations to update their devices.
As of now, the exploit is publicly available, and there have been no known patches released. Organizations should remain vigilant and monitor their devices for any signs of exploitation while preparing for remediation.
Vulnerability Details
The vulnerability pertains to the function FUN_00412244 in the D-Link DIR-823X firmware. It is categorized under multiple Common Weakness Enumerations (CWE), including CWE-404 (Improper Resource Shutdown or Release) and CWE-476 (NULL Pointer Dereference).
The CVSS score of 8.7 indicates a high severity level, and the attack vector is defined as 'NETWORK'. This means that an attacker can exploit the vulnerability from a remote location without needing physical access to the device.
The vulnerability affects all versions of the D-Link DIR-823X firmware prior to the release of a patch. The exploit can lead to significant availability impact, causing devices to become non-operational.
Technical Analysis
The root cause of the vulnerability is a failure in proper null pointer checks in the function FUN_00412244. When this function is called without the necessary validation, it results in a null pointer dereference, leading to potential crashes or service disruptions.
The attack vector is network-based, which means that an attacker can exploit this vulnerability from anywhere on the internet. The complexity of the attack is low, as it does not require any special conditions or authentication. Moreover, no user interaction is needed to trigger the exploit.
The exploitation of this vulnerability could lead to complete denial of service, as the availability impact is rated as high. Confidentiality and integrity impacts are rated as none, indicating that this vulnerability primarily affects the availability of the system.
Risk & Impact Analysis
Risk to organizations includes significant downtime and potential disruption of services, which could result in financial losses or reputational damage. The vulnerability's high severity indicates that organizations using the affected D-Link DIR-823X firmware need to act swiftly to mitigate risks.
The blast radius is large, given that many devices may be affected by this firmware issue, especially in environments with numerous D-Link products. Organizations should assess their exposure and prioritize patching to minimize the risk of exploitation.
The urgency to address this vulnerability is high due to its potential for exploitation and the availability impact. Organizations should schedule remediation promptly to ensure devices are secured against possible attacks.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of the D-Link DIR-823X firmware include 240126 and 240802. Organizations using these versions should take immediate action to remediate the vulnerability.
Mitigation & Remediation
Organizations must prioritize patching the D-Link DIR-823X firmware to address this vulnerability. Ensure that devices are updated to the latest firmware version as soon as it becomes available. If a patch is not immediately available, consider implementing network controls to restrict access to affected devices.
For additional security, organizations should review their current security posture and consider a penetration testing service to identify similar vulnerabilities in their network.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor logs for unusual access patterns or errors related to the affected function. Additionally, behavioral anomalies in the device's performance may indicate attempts to exploit the vulnerability.
AppSecure Threat Intelligence Insight
This vulnerability underscores the need for proactive security measures in consumer network devices. The ease of exploitation and high potential impact highlights the importance of vulnerability management practices.
Organizations should stay informed about emerging threats and vulnerabilities to ensure their defenses are up to date. For detailed guidance on managing vulnerabilities, organizations can refer to our vulnerability management program and consider leveraging our penetration testing methodology to enhance their security posture.
As cybersecurity threats evolve, organizations must adopt a continuous improvement approach to their security practices.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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