CVE-2021-20124 is identified as a high-severity local file inclusion vulnerability affecting DrayTek VigorConnect version 1.6.0-B3. This vulnerability allows unauthenticated attackers to leverage the file download functionality of the WebServlet endpoint to download arbitrary files from the underlying operating system with root privileges. The implications of this vulnerability are significant, as it can lead to unauthorized access to sensitive information stored on the system.
The severity of this vulnerability is rated at a CVSS score of 7.5, indicating a high level of risk to organizations. The attack vector is network-based, and the attack complexity is low, meaning that attackers do not require any special privileges or user interaction to exploit this vulnerability. Given the potential for significant data exposure, organizations utilizing DrayTek VigorConnect should prioritize immediate remediation.
As of the latest assessment, there is no public proof-of-concept (PoC) or confirmed exploit available for this vulnerability. However, the existence of a path traversal vulnerability in a widely used product raises concerns over potential exploitation in the wild. Organizations should remain vigilant and monitor for any developments regarding this vulnerability.
Given its high severity, organizations are urged to apply vendor patches or mitigations immediately to prevent exploitation. Failure to address this vulnerability could result in unauthorized access and significant data breaches.
Vulnerability Details
The official description for CVE-2021-20124 indicates that a local file inclusion vulnerability exists in DrayTek VigorConnect 1.6.0-B3. The affected functionality is related to file download operations within the WebServlet endpoint. As previously noted, an unauthenticated attacker can exploit this vulnerability to access and download arbitrary files, which can lead to severe consequences, including data theft and system compromise.
This vulnerability is classified under CWE-22, which covers improper limitation of a pathname to a restricted directory ('path traversal'). The CVSS score of 7.5 signifies high severity with a confidentiality impact rated as high, while integrity and availability impacts are rated as none.
The vulnerability was published on October 13, 2021. Organizations need to be aware of the implications of this vulnerability and take appropriate action to mitigate risks associated with its exploitation.
Technical Analysis
The root cause of this vulnerability lies in the improper handling of file paths within the file download functionality. Attackers may leverage this vulnerability by crafting specific requests that manipulate the file path, enabling them to access sensitive files on the server. The attack vector is network-based, allowing remote exploitation without the need for physical access to the system.
The attack complexity is classified as low, meaning that the exploitation of this vulnerability does not require advanced skills or knowledge. There are no privileges required for an attacker to exploit this vulnerability, and user interaction is not necessary, making it particularly dangerous.
In terms of impact, the confidentiality of the system is at high risk, as attackers can download sensitive information. However, the integrity and availability of the system are not directly affected by this vulnerability, which is a critical consideration when evaluating overall risk.
Risk & Impact Analysis
Risk to organizations includes potential exposure of sensitive data due to unauthorized access facilitated by this vulnerability. The ability for unauthenticated attackers to download files with root privileges can lead to severe consequences such as data breaches or loss of operational integrity.
The blast radius for this vulnerability is considerable. Since it affects the core functionality of file downloads in DrayTek VigorConnect, any sensitive files stored on the system are at risk. Organizations using this product must assess their deployment and identify any critical data that could be exposed.
Given the high CVSS score and the fact that this vulnerability is included in the Known Exploited Vulnerabilities (KEV) catalog, organizations should prioritize patching immediately. The urgency to remediate this vulnerability cannot be overstated, as the risk of exploitation increases over time.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The affected version is DrayTek VigorConnect 1.6.0-B3. Organizations using this version should take immediate action to apply the necessary patches or mitigations provided by the vendor. If version information is missing, it is recommended to assume that all versions prior to the vendor patch are vulnerable.
Mitigation & Remediation
Organizations should apply the patches provided by DrayTek for VigorConnect immediately. If patches are unavailable, it is recommended to discontinue use of the product until a fix is implemented. For further guidance, organizations can refer to the vendor's instructions on remediation.penetration testing services can also help validate the effectiveness of the remediation steps taken.
Detection Guidance
Organizations should monitor logs for any unusual file access activity or attempts to download sensitive files from the system. Additionally, behavioral anomalies in user activity and network signatures indicative of exploitation should be investigated promptly.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-20124 is underlined by its inclusion in the KEV catalog. This highlights the growing trend of attackers exploiting vulnerabilities related to file handling and path traversal in widely used software. Security teams should prioritize conducting regular security assessments and ensure that all software components are up-to-date.
This vulnerability serves as a reminder of the critical importance of secure coding practices. Organizations should conduct regular training for developers on common vulnerabilities and their prevention strategies.
To gain deeper insights into securing applications, organizations should consider implementing a comprehensive security testing program and engage in continuous monitoring of their systems.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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