A vulnerability was found in GreenCMS up to version 2.3, specifically affecting the function themeadd located in the file /index.php?m=admin&c=custom&a=themeadd. This vulnerability allows attackers to perform unrestricted file uploads, which can lead to various security issues. The attack can be launched remotely, making it particularly concerning for organizations using this software. The exploit has been made public, increasing the urgency for organizations to address this issue promptly.
The severity of this vulnerability is classified as medium, with a CVSS score of 5.3. This indicates a moderate level of risk, as the vulnerability can be exploited with low complexity and requires only low privileges. As this vulnerability affects products that are no longer supported by the maintainer, organizations using outdated versions of GreenCMS should take immediate action to mitigate potential risks.
Risk to organizations includes unauthorized access to the system and potential data breaches due to the unrestricted upload feature. Given that the exploit is public, attackers may leverage this vulnerability to compromise affected systems. Organizations should prioritize patching immediately to protect their environments.
As of now, the vulnerability status is marked as 'Received', and there is no public exploit confirmed. However, the nature of the vulnerability and its public disclosure warrants immediate attention from security teams.
Vulnerability Details
The identified vulnerability in GreenCMS allows for unrestricted file uploads due to improper validation in the themeadd function. The CVSS 4.0 vector indicates that the attack can be executed over the network, with low attack complexity and low privileges required. The confidentiality, integrity, and availability impacts are all rated as low, highlighting a moderate risk that needs addressing.
Technical Analysis
The root cause of this vulnerability stems from insufficient validation of uploaded files. Attackers can exploit this weakness to upload potentially malicious files, which could lead to further compromise of the system. The attack vector is a network, and given the low complexity, it makes this vulnerability particularly attractive to potential attackers.
Risk & Impact Analysis
Organizations should assess the real-world deployment risk of this vulnerability. Any application using an unsupported version of GreenCMS is at risk of exploitation. The potential blast radius includes unauthorized file uploads that can lead to data breaches or system compromise. Given the CVSS score of 5.3, this vulnerability should be addressed in the priority patch cycle.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
This vulnerability affects all versions of GreenCMS up to 2.3. Organizations using these versions should prioritize upgrading to avoid potential exploitation.
Mitigation & Remediation
To mitigate this vulnerability, organizations should apply any available patches or updates to their GreenCMS installations. If a patch is not available, consider implementing workarounds such as restricting file uploads to only trusted file types or implementing additional validation checks on uploaded files. For enhanced security, organizations may benefit from conducting a thorough security assessment, which can be facilitated through application security assessment. Organizations are also encouraged to monitor their systems for any unusual activity that could indicate an attempt to exploit this vulnerability.
Detection Guidance
Organizations should monitor logs for anomalies related to file upload activities and review access logs for unusual patterns. Behavioral anomalies such as unexpected file modifications or uploads should be flagged for further investigation. System changes that are not authorized should also be closely monitored to detect potential exploitation attempts.
AppSecure Threat Intelligence Insight
This vulnerability represents a concerning trend in web application security where insufficient validation of inputs can lead to significant risks. Organizations must remain vigilant about the security of their applications, particularly those that are no longer supported by vendors. The lessons learned from this incident reinforce the importance of implementing robust security measures, including thorough testing and validation of all user inputs. For further reading on how to enhance your security posture, consider reviewing our guide on penetration testing methodology and the importance of maintaining a proactive security stance. Additionally, organizations should educate their teams on common vulnerabilities and how to prevent them, which is detailed in our vulnerability management program design guide. Finally, understanding the latest trends in security can be beneficial, which is why we encourage reviewing our insights on ransomware targeting trends to stay informed.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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