CVE-2021-20123 is classified as a local file inclusion vulnerability affecting DrayTek VigorConnect version 1.6.0-B3. This vulnerability allows an unauthenticated attacker to exploit the file download functionality of the DownloadFileServlet endpoint. By leveraging this vulnerability, attackers could download arbitrary files from the underlying operating system with root privileges.
The severity of this vulnerability is categorized as high, with a CVSS score of 7.5. The potential impact is significant due to its ability to compromise sensitive information, as unauthorized access to files can lead to further exploitation of the system.
As of now, there is no public exploit confirmed in the wild, but given the vulnerability's nature, organizations using affected versions of DrayTek VigorConnect should prioritize remediation efforts. The urgency for patching is critical, as attackers may seek to exploit this weakness.
Organizations should prioritize patching immediately. The rapid deployment of patches will mitigate the risk associated with this vulnerability and protect sensitive data from unauthorized access.
Vulnerability Details
The official CVE description highlights a local file inclusion vulnerability that exists in DrayTek VigorConnect 1.6.0-B3, specifically in the DownloadFileServlet endpoint. This vulnerability is categorized under CWE-22, indicating a potential path traversal issue.
The CVSS score of 7.5 indicates a high severity level, which signifies that this vulnerability can be easily exploited over a network with low complexity, and no privileges or user interaction are required.
This vulnerability was published on October 13, 2021, and has been classified as analyzed. The underlying issue allows for high confidentiality impact, while the integrity and availability impacts are noted as none.
Technical Analysis
The root cause of CVE-2021-20123 lies in improper validation of user-supplied input, allowing attackers to manipulate file paths. The attack vector is network-based, and the complexity is categorized as low, making it accessible to potential attackers.
No privileges are required for exploitation, and there is no need for user interaction, which further enhances the vulnerability's risk profile. The confidentiality impact is high, as attackers can access sensitive files, while integrity and availability remain unaffected.
Risk & Impact Analysis
Real-world deployment risk for CVE-2021-20123 is significant. Organizations utilizing DrayTek VigorConnect should understand that the potential for sensitive data exposure is high. The blast radius could extend to any system connected to the affected product, leading to unauthorized access to critical files.
The urgency assessment is critical, considering the CVSS score of 7.5 and its presence in the Known Exploited Vulnerabilities (KEV) catalog. Organizations should address this vulnerability in their patch cycle promptly to avoid exploitation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The vulnerability affects VigorConnect version 1.6.0-B3. All versions prior to vendor patch may be impacted. Organizations should verify their installed version against the vendor's advisory.
Mitigation & Remediation
To mitigate the risk associated with this vulnerability, organizations must apply patches as per the vendor's instructions. If a patch is unavailable, organizations should consider discontinuing the use of the product until a resolution is provided.
For further details on mitigation strategies, organizations can refer to the penetration testing services available.
Detection Guidance
Organizations should monitor their systems for unusual log entries or behavioral anomalies that may indicate exploitation attempts. Specific indicators include failed attempts to access sensitive files or unusual download patterns.
AppSecure Threat Intelligence Insight
CVE-2021-20123 highlights the ongoing need for robust security measures in network-accessible products. As vulnerabilities like this become apparent, they serve as a reminder of the importance of proactive security assessments. Security teams should regularly conduct vulnerability management programs to identify and remediate such weaknesses.
Furthermore, the presence of this vulnerability in the KEV catalog underscores the urgency for organizations to stay updated with their security patches and to remain vigilant against potential exploitation.
For further insights into effective security practices, organizations can refer to our penetration testing methodology blog.
Finally, understanding the implications of this vulnerability is crucial for developing an effective security posture. Organizations should leverage this incident to enhance their security frameworks and ensure they are prepared for similar vulnerabilities in the future.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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