CVE-2021-41279 is a high-severity vulnerability affecting BaserCMS, an open source content management system focused on Japanese language support. This vulnerability allows users with upload privileges to upload crafted zip files capable of path traversal on the host operating system. Organizations utilizing BaserCMS should take immediate action to mitigate this risk, as it could lead to unauthorized access or manipulation of sensitive files on the system.
The CVSS score for this vulnerability is 7.7, indicating a high level of severity. The potential impact on confidentiality is significant, as attackers may exploit this vulnerability to access sensitive data. Additionally, the vulnerability is classified under CWE-22, which pertains to improper limitation of a pathname to a restricted directory. Given the nature of this vulnerability and the associated risks, organizations should prioritize patching immediately.
As of now, there are no known public exploits or confirmed instances of exploitation for this vulnerability. However, the low complexity and the requirement for low privileges make it a vector that attackers may leverage in the future. Therefore, timely remediation is crucial to prevent any potential exploitation.
Organizations are advised to check their BaserCMS installations and ensure they are updated to the latest version to address this vulnerability. This proactive step is essential in maintaining the security and integrity of their systems.
Vulnerability Details
The vulnerability has been classified with a CVSS score of 7.7, which indicates a high severity level. The vulnerability description states that this vulnerability allows users with upload privileges to upload crafted zip files which can lead to path traversal on the host operating system. The affected versions include all versions prior to 4.5.4.
Technical Analysis
The root cause of this vulnerability lies in improper input validation during the file upload process. Users are able to craft zip files that exploit this weakness, leading to potential access to sensitive files on the host system. The attack vector is network-based, and the attack complexity is low, requiring only low privileges for exploitation. Importantly, user interaction is not required for the attack to succeed.
The potential impacts of this vulnerability include a high confidentiality impact, as attackers may gain access to sensitive information stored on the server. However, there is no integrity or availability impact associated with this vulnerability.
Risk & Impact Analysis
Risk to organizations includes the potential for attackers to exploit this vulnerability to access sensitive data. The blast radius could extend to all users of the affected system, especially if the system is widely used within an organization. Given the high CVSS score and the nature of the attack vector, organizations should prioritize remediation efforts to mitigate the risk of exploitation.
With the vulnerability being of high severity, organizations must act swiftly to protect their environments. The urgency for defenders is critical, given the potential impact and the low complexity of the attack.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of BaserCMS are all versions prior to 4.5.4. Organizations are encouraged to update their installations to this version or later to mitigate the vulnerability.
Mitigation & Remediation
To mitigate this vulnerability, organizations should update their BaserCMS installations to version 4.5.4 or later. For those unable to immediately apply the patch, it is recommended to implement strict file upload controls to prevent the upload of zip files. Additionally, organizations should consider implementing a web application firewall (WAF) to help detect and block potential exploit attempts.
For further assistance in validating the security of your applications, organizations can explore penetration testing services offered by AppSecure.
Detection Guidance
Organizations should monitor their logs for any unusual file upload activities, specifically looking for attempts to upload zip files. Additionally, behavioral anomalies related to file management and access patterns should be flagged for further investigation.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-41279 highlights the need for organizations to maintain robust security practices around file uploads. This vulnerability represents a common flaw in many web applications where insufficient input validation can lead to severe consequences.
Security teams should take this incident as a reminder to regularly review and update their security measures, particularly those relating to file uploads and user permissions. For further insights on strengthening security practices, organizations can refer to articles on vulnerability management and penetration testing methodology to enhance their defensive strategies.
Organizations should also stay informed about emerging threats and vulnerabilities to ensure their security measures remain effective. Regularly updating software and conducting security assessments are essential practices for mitigating risks.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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