The vulnerability identified by CVE-2020-13671 affects Drupal Core, where improper sanitization of certain filenames on uploaded files can result in files being misinterpreted as incorrect extensions. This misinterpretation can lead to files being served with the wrong MIME type or even executed as PHP under specific hosting configurations. The affected versions include Drupal Core 9.0 prior to 9.0.8, 8.9 prior to 8.9.9, 8.8 prior to 8.8.11, and 7 prior to 7.74.
With a CVSS score of 8.8, this vulnerability is classified as high severity. The potential risk to organizations includes unauthorized access to sensitive data and the possibility of executing arbitrary code. Attackers may leverage this vulnerability to exploit systems and escalate privileges, particularly when the affected systems are improperly configured.
Exploitation status indicates that this vulnerability is included in the Known Exploited Vulnerabilities (KEV) catalog as of January 18, 2022, which signifies its relevance and the urgency required for remediation. Organizations should prioritize patching immediately to mitigate the associated risks.
Given the potential impacts, organizations using affected versions of Drupal should act swiftly, applying necessary updates and mitigating any exposure. This proactive approach is essential in maintaining security integrity.
Vulnerability Details
Drupal Core has been identified with a vulnerability that stems from improper sanitization of uploaded filenames, leading to potential misinterpretation and execution issues. This vulnerability falls under the CWE-434 classification for Unrestricted File Upload. The official CVSS score is 8.8, indicating significant risk.
The affected products include multiple versions of Drupal Core, specifically those released prior to the mentioned patches. The publication date of this vulnerability is November 20, 2020.
Technical Analysis
The root cause of this vulnerability is a failure to properly sanitize filenames of uploaded files. Attack vectors include network exploitation, as the vulnerability can be triggered remotely. The attack complexity is low, with only low-level privileges required to exploit it.
User interaction is not required to exploit this vulnerability, which increases its risk profile. The impacts on confidentiality, integrity, and availability are all significant, resulting in high potential damage.
Risk & Impact Analysis
The risk to organizations includes unauthorized access and execution of malicious code due to improper file handling. This vulnerability poses a significant threat, especially in environments where Drupal is widely deployed and potentially exposes sensitive data.
Given the urgency associated with the CVSS score, organizations are advised to address this vulnerability as part of their priority patch cycle.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The affected versions of Drupal Core include: versions 9.0 prior to 9.0.8, 8.9 prior to 8.9.9, 8.8 prior to 8.8.11, and 7 prior to 7.74. Organizations should check their current version and apply necessary patches.
Mitigation & Remediation
Organizations should apply updates as per vendor instructions to resolve this vulnerability. Patching Drupal to the latest version is essential to mitigate risks. If immediate patching is not feasible, consider implementing configuration hardening and network controls to minimize exposure.
For further guidance on security best practices, organizations can refer to the continuous security testing services offered by AppSecure.
Detection Guidance
Organizations should monitor logs for indicators of any unauthorized file uploads or suspicious activity related to file handling. Behavioral anomalies within the application should also be tracked to detect potential exploitation of this vulnerability.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2020-13671 highlights the importance of robust input validation and file handling practices in web applications. This vulnerability demonstrates how minor oversights in code can lead to severe security implications, underscoring the need for continuous assessment of security postures.
Security teams are encouraged to learn from this incident by implementing comprehensive security testing methodologies. For deeper insights on penetration testing, organizations can explore our penetration testing methodology and the importance of maintaining a proactive security posture.
For organizations leveraging cloud environments, understanding specific vulnerabilities is critical. Our blog on cloud penetration testing can provide valuable insights.
Additionally, organizations should consider engaging in red teaming exercises to simulate real-world attacks and assess defenses.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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