CVE-2015-0889 in Joyful Note
Summary
by MITRE
KENT-WEB Joyful Note before 5.3 allows remote attackers to delete files or write to files, and consequently execute arbitrary code, via vectors involving an article.
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Analysis
by VulDB Data Team • 04/14/2018
The vulnerability identified as CVE-2015-0889 affects KENT-WEB Joyful Note versions prior to 5.3, representing a critical security flaw that enables remote attackers to perform unauthorized file operations on affected systems. This vulnerability resides within the article handling functionality of the web application, making it particularly dangerous as it can be exploited without requiring local system access or authentication credentials. The flaw stems from inadequate input validation and improper access controls within the file management components that process article-related data submissions.
The technical implementation of this vulnerability demonstrates a classic case of insufficient privilege checking and unsafe file operations within web applications. Attackers can manipulate article submission parameters to trigger file deletion or writing operations, potentially leading to arbitrary code execution on the target system. This type of vulnerability aligns with CWE-22, which describes improper limitation of a pathname to a restricted directory, and CWE-74, which addresses injection flaws. The attack vector specifically exploits weaknesses in how the application processes user-supplied data when creating or modifying articles, allowing malicious inputs to bypass normal file system access controls and execute unintended operations.
The operational impact of CVE-2015-0889 extends beyond simple data compromise, as it provides attackers with the capability to fundamentally alter the application's functionality and potentially gain persistent access to the underlying system. Remote exploitation means that attackers can leverage this vulnerability from any location without requiring physical access to the network, making it particularly attractive for automated attacks. The ability to delete files can result in data loss, service disruption, and potential system instability, while the file writing capability can be used to install backdoors, modify application code, or establish persistent command and control channels. This vulnerability directly maps to several ATT&CK techniques including T1059 for command and scripting interpreter and T1078 for valid accounts, as attackers can leverage compromised applications to execute malicious code and maintain access.
Mitigation strategies for this vulnerability must address both the immediate security gap and broader architectural weaknesses within the application. The most direct solution involves upgrading to KENT-WEB Joyful Note version 5.3 or later, which includes proper input validation and access control mechanisms. Additionally, implementing comprehensive input sanitization, enforcing strict file path validation, and applying principle of least privilege access controls can significantly reduce the attack surface. Network-level protections such as web application firewalls and intrusion detection systems can provide additional layers of defense, while regular security audits and penetration testing help identify similar vulnerabilities in other application components. Organizations should also implement proper monitoring and logging of file system operations to detect unauthorized activities that may indicate exploitation attempts.