The LuxCal Web Calendar prior to 5.3.3M (MySQL version) and prior to 5.3.3L (SQLite version) contains a path traversal vulnerability in dloader.php. If this vulnerability is exploited, arbitrary files on a server may be obtained. This vulnerability has been assigned a CVSS score of 5.3, indicating a medium severity level, which requires immediate attention from organizations using the affected versions. The risk to organizations includes unauthorized access to sensitive files, potentially leading to data breaches.
Given the nature of path traversal vulnerabilities, attackers may leverage this weakness to read sensitive files on the server, impacting confidentiality. While the exploitability score is medium, it is essential to note that the lack of user interaction and the low privileges required for exploitation further elevate the urgency for organizations to address this vulnerability.
Organizations should prioritize patching immediately, as failure to do so could expose them to potential data leaks and breaches. It is crucial to stay informed about the latest security updates and to implement robust security measures to defend against such vulnerabilities.
The vulnerability was disclosed on February 18, 2025, and organizations that have not yet updated to the latest version of LuxCal Web Calendar should do so as soon as possible.
Vulnerability Details
The LuxCal Web Calendar is affected by a path traversal vulnerability that allows attackers to access arbitrary files on the server through the dloader.php script. The vulnerability is classified as CWE-22 (Improper Limitation of a Pathname to a Restricted Directory).
The CVSS score for this vulnerability is 5.3, categorized as medium severity. The CVSS vector indicates an attack vector over the network, with low attack complexity, no privileges required, and no user interaction necessary. The impact on confidentiality is low, with no integrity or availability impact reported.
The affected products include versions of the LuxCal Web Calendar prior to 5.3.3M for MySQL and prior to 5.3.3L for SQLite. Organizations must ensure they are running a patched version to mitigate this risk.
Technical Analysis
The root cause of this vulnerability lies in the improper validation of user input in the dloader.php script. Attackers can exploit this weakness by manipulating input parameters to access files outside of the intended directory, leading to unauthorized file reading.
The attack vector is network-based, which means that an attacker does not need physical access to the server to exploit this vulnerability. The attack complexity is low, as no specific conditions need to be met for exploitation. Importantly, no privileges are required, and user interaction is not necessary, making it easier for potential attackers to exploit this vulnerability.
In terms of impacts, the vulnerability primarily affects confidentiality, as attackers may gain access to sensitive files. There are no reported impacts on integrity or availability. Organizations should monitor their systems for any suspicious activity that may indicate exploitation attempts.
Risk & Impact Analysis
The real-world deployment risk associated with this vulnerability is significant. Organizations using affected versions of the LuxCal Web Calendar may experience unauthorized file access, leading to potential data breaches. This could result in regulatory repercussions, reputational damage, and loss of customer trust.
The blast radius potential is concerning, especially for organizations with sensitive data stored on their servers. Attackers could leverage this vulnerability to access configuration files, user data, or other critical information, thereby increasing the urgency for patching.
Given the CVSS score of 5.3 and the absence of known exploitation in the wild, organizations still face a medium urgency for remediation. Organizations should schedule remediation as part of their priority patch cycle to mitigate risks associated with this vulnerability.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The versions of LuxCal Web Calendar affected by this vulnerability include all versions prior to 5.3.3M for MySQL and 5.3.3L for SQLite. Organizations must upgrade to at least these versions to mitigate the vulnerability.
Mitigation & Remediation
Organizations should upgrade their LuxCal Web Calendar installations to the latest versions (5.3.3M for MySQL and 5.3.3L for SQLite) to remediate this vulnerability. If immediate upgrading is not feasible, organizations should implement appropriate workarounds to restrict access to the dloader.php script.
For additional security, organizations can enhance their security by implementing network controls to restrict access to sensitive files and monitoring for unusual file access patterns. Regular security testing is also recommended to identify potential vulnerabilities in the system.
Organizations should validate remediation through penetration testing to identify similar weaknesses.
Detection Guidance
Organizations should monitor logs for any indicators of unauthorized file access through dloader.php. Behavioral anomalies, such as unexpected access to sensitive files, should be flagged for further investigation.
Network signatures that indicate access attempts to restricted files should be implemented, and system changes should be monitored to detect potential exploitation of this vulnerability.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability lies in the ongoing risk organizations face regarding path traversal vulnerabilities. This vulnerability represents a common attack vector that can lead to severe data breaches if not addressed promptly.
Security teams should learn from this incident and implement comprehensive security testing practices to identify such vulnerabilities in the future. Regular updates and security assessments are critical in maintaining a secure environment.
Organizations are encouraged to enhance their security posture by engaging in penetration testing methodologies and integrating them into their security programs.
For organizations utilizing cloud services, it is essential to follow best practices for cloud penetration testing to ensure their applications are secure against similar vulnerabilities.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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