CVE-2021-33990 is a critical vulnerability affecting Liferay Portal 6.2.5, which allows unauthorized users to upload files through specific requests, specifically when the frmfolders.html page is accessed. The severity of this vulnerability, with a CVSS score of 9.8, indicates an extreme risk due to its potential impact on confidentiality, integrity, and availability.
The vulnerability is classified as a critical risk primarily because it enables attackers to upload malicious files, which could lead to further exploitation of the system. The attack vector is network-based, and the complexity of the attack is low, requiring no privileges or user interaction, which increases the urgency for organizations to address this issue.
As such, organizations utilizing Liferay Portal versions prior to the patched versions should take immediate steps to secure their systems against this vulnerability. The presence of a known exploit further emphasizes the risk, making it crucial for defenders to implement remedial measures without delay.
Organizations should prioritize patching immediately to mitigate the risks associated with CVE-2021-33990. Regular security assessments and timely updates are essential to protect against vulnerabilities of this nature.
Vulnerability Details
The CVE description indicates that Liferay Portal 6.2.5 allows Command=FileUpload&Type=File&CurrentFolder=/ requests when the frmfolders.html page exists. The vendor disputes the severity of this issue, stating that the exploit reference does not demonstrate how an unauthorized user can upload a file. However, the potential for file uploads without proper authorization remains a significant concern.
With a CVSS score of 9.8, this vulnerability is categorized as critical. The implications are severe, with high impacts on confidentiality, integrity, and availability, necessitating a focused response from affected organizations.
The vulnerability is classified under CWE-281 (Improper Authentication) and CWE-78 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), indicating the nature of the weaknesses involved.
Technical Analysis
The root cause of this vulnerability lies in insufficient validation of user permissions when handling file upload requests. Attackers may leverage this flaw by crafting specific requests targeting the frmfolders.html endpoint, exploiting the improper access control mechanisms in place.
The attack vector is network-based, allowing remote attackers to exploit this vulnerability without requiring physical access to the system. The attack complexity is low, as it does not necessitate any privileges or user interaction, making it accessible to a broader spectrum of potential attackers.
The impact on confidentiality, integrity, and availability is high, as successful exploitation could lead to unauthorized information disclosure, modification, and service disruptions.
Risk & Impact Analysis
The real-world risk associated with CVE-2021-33990 is significant. Organizations utilizing Liferay Portal are at risk of unauthorized file uploads, which can facilitate further attacks, including data breaches and system compromises.
The blast radius potential is considerable, as compromised systems could lead to the exposure of sensitive data or the disruption of services. Given the critical nature of this vulnerability, organizations should address it in their priority patch cycle.
With a CVSS score of 9.8 and an EPS score in the 98th percentile, the urgency for remediation is underscored. Organizations must implement the necessary patches and updates to mitigate the risks posed by this vulnerability.
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The only affected version identified is Liferay Portal 6.2.5. Organizations running this version must take immediate action to patch their systems. If version information is missing, the guidance is to consider all versions prior to the vendor patch as affected.
Mitigation & Remediation
To remediate this vulnerability, organizations should implement the following actions:
1. **Patch the System**: Upgrade to a version of Liferay Portal that addresses this vulnerability.
2. **Configuration Hardening**: Ensure that proper access controls are implemented to restrict unauthorized file uploads.
3. **Network Controls**: Implement network segmentation and firewalls to limit exposure to potential attackers.
4. **Monitoring Recommendations**: Regularly monitor logs for any unauthorized access attempts or anomalies.
Organizations can validate remediation through penetration testing to ensure that similar vulnerabilities are not present.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should establish the following monitoring strategies:
1. **Log Indicators**: Monitor access logs for unusual requests targeting the frmfolders.html page.
2. **Behavioral Anomalies**: Identify patterns of behavior that deviate from normal operations, such as repeated unauthorized access attempts.
3. **Network Signatures**: Implement signatures to detect known patterns of exploitation associated with this vulnerability.
4. **System Changes**: Monitor for unexpected changes to system files or configurations that may indicate exploitation.
AppSecure Threat Intelligence Insight
CVE-2021-33990 represents a critical vulnerability that highlights the importance of robust access controls in web applications. The presence of a known exploit should prompt organizations to reassess their security posture and implement more stringent measures against unauthorized file uploads.
This vulnerability is part of a broader trend of increasing risks associated with web application security, emphasizing the need for organizations to adopt comprehensive security strategies.
Security teams can benefit from a structured approach to vulnerability management, which includes regular assessments and penetration testing. For more information on effective strategies, organizations can refer to our vulnerability management program design and best practices for application security.
Additionally, organizations should stay informed about evolving threats through continuous learning and adaptation. Our insights into the latest trends in application security can be found in our penetration testing methodology blog.
Finally, organizations should engage with security experts and communities to share knowledge and improve defenses against vulnerabilities like CVE-2021-33990. For deeper insights and strategies, our blog on file upload vulnerabilities provides essential guidance.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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