CVE-2021-45382 is a critical Remote Command Execution (RCE) vulnerability affecting multiple D-Link router models, including the DIR-810L, DIR-820L, DIR-826L, DIR-830L, and DIR-836L. The vulnerability arises from the DDNS function in the ncc2 binary file. Importantly, all these hardware revisions have reached their End of Life ("EOL") and will not receive any patches, leaving them vulnerable to exploitation.
According to the CVSS scoring system, this vulnerability has a base score of 9.8, categorized as critical. The implications of such a high score indicate significant risk to organizations that utilize these devices in their networks. Attackers may leverage this vulnerability to execute arbitrary commands remotely, potentially compromising sensitive data and network integrity.
Given the nature of this vulnerability and the fact that affected products are no longer supported, organizations must prioritize remediation. Disconnecting these devices from the network is recommended if they are still in use, as this will mitigate the risk of exploitation.
The urgency for defenders is high; immediate action is required to ensure that vulnerable devices are either upgraded or removed from operational environments. Failure to do so could lead to unauthorized access and extensive damage.
Vulnerability Details
The official description of CVE-2021-45382 states that a Remote Command Execution (RCE) vulnerability exists in all series H/W revisions of the affected D-Link routers via the DDNS function within the ncc2 binary file. This vulnerability is classified under CWE-78, which pertains to OS Command Injection.
The CVSS 3.1 score for this vulnerability is 9.8, indicating a critical severity level. The vulnerability is characterized by a network attack vector, low attack complexity, and it requires no privileges or user interaction for exploitation. The impact on confidentiality, integrity, and availability is rated as high.
The affected products include the DIR-810L, DIR-820L, DIR-820LW, DIR-826L, DIR-830L, and DIR-836L routers. These products no longer receive updates or support, which significantly increases the risk associated with their deployment.
Technical Analysis
The root cause of this vulnerability lies in the handling of inputs by the DDNS function, which allows for command injection. The attack vector is network-based, meaning that an attacker can exploit the vulnerability remotely without physical access to the devices. The attack complexity is low due to the straightforward nature of the exploitation.
In terms of privileges required, none are necessary for an attacker to exploit this vulnerability. Additionally, user interaction is not required, making this vulnerability particularly dangerous. The potential impacts are severe—confidentiality, integrity, and availability could all be significantly compromised.
Risk & Impact Analysis
The real-world deployment risk associated with CVE-2021-45382 is high. Given that numerous organizations may still be using these routers, the blast radius of potential exploitation is substantial. The vulnerability allows attackers to execute arbitrary commands, which could lead to full system compromise.
Organizations using these devices should consider the urgency of the situation. The CVSS score indicates a critical level of risk, and the fact that the devices have reached EOL means that no patches or updates will be forthcoming. The urgency for remediation is high, and organizations must act swiftly to avoid severe consequences.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The affected versions include all hardware revisions of the following D-Link router models: DIR-810L, DIR-820L, DIR-820LW, DIR-826L, DIR-830L, and DIR-836L. As these devices have reached their End of Life, no patches will be provided.
Mitigation & Remediation
Organizations must act quickly to mitigate the risks associated with CVE-2021-45382. The impacted products are EOL and should be disconnected from the network if still in use. For users seeking alternative solutions, consider upgrading to more secure models that receive regular updates.
For ongoing security assessments, organizations can benefit from penetration testing services to identify and remediate vulnerabilities.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor for unusual command executions in system logs, particularly those associated with the DDNS function. Additionally, network traffic associated with these routers should be scrutinized for signs of unauthorized command execution.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-45382 highlights the critical nature of maintaining up-to-date technologies in security-sensitive environments. This incident serves as a reminder of the risks associated with using unsupported hardware, particularly in the context of increased cyber threats.
Security teams should recognize the pattern of vulnerabilities emerging from legacy systems and prioritize proactive measures. For comprehensive security assessments, consider application security assessments to identify weaknesses in both existing and new deployments.
Furthermore, the importance of implementing continuous security testing cannot be overstated, as it helps organizations stay ahead of emerging threats.
In conclusion, organizations must remain vigilant and responsive to vulnerabilities like CVE-2021-45382 to safeguard their networks and data effectively.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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