CVE-2024-52406 is a security vulnerability identified in the wibergsweb CSV to html application, specifically versions up to 3.26. The vulnerability arises from the application's failure to restrict the upload of files with dangerous types, which allows an attacker to upload arbitrary files, including web shells, to the web server hosting the application. A web shell is a malicious script that provides an attacker with remote command execution capabilities on the compromised server. This unrestricted file upload flaw means that an attacker can bypass any intended file type restrictions or validation controls, directly placing executable code on the server. The vulnerability does not require authentication or user interaction, making it easier for remote attackers to exploit. Once a web shell is uploaded, the attacker can execute commands, escalate privileges, move laterally within the network, or exfiltrate sensitive data. The vulnerability affects all versions of CSV to html up to and including 3.26, with no patch currently linked or available at the time of publication. Although no known exploits have been reported in the wild yet, the nature of the vulnerability and the ease of exploitation make it a critical threat. The lack of a CVSS score necessitates an assessment based on the potential impact and exploitability. This vulnerability is particularly dangerous because it compromises the confidentiality, integrity, and availability of the affected systems. Attackers can gain persistent access and control over the web server, potentially impacting other connected systems and services. The vulnerability is assigned by Patchstack and was published on November 16, 2024.

The impact of CVE-2024-52406 is severe for organizations running the vulnerable wibergsweb CSV to html application. Successful exploitation allows attackers to upload web shells, leading to remote code execution on the web server. This can result in full system compromise, data breaches, unauthorized access to sensitive information, and disruption of services. Attackers may use the compromised server as a foothold to pivot into internal networks, escalate privileges, or launch further attacks such as ransomware deployment or data exfiltration. The integrity of the web application and the underlying server is at risk, as attackers can modify or delete files, inject malicious content, or manipulate application behavior. Availability may also be affected if attackers disrupt services or cause system crashes. The vulnerability's ease of exploitation without authentication increases the likelihood of automated attacks and widespread exploitation once public exploit code becomes available. Organizations with internet-facing instances of the vulnerable software are particularly at risk, as attackers can remotely target these systems without needing prior access. The absence of a patch or mitigation guidance at the time of disclosure further exacerbates the risk, requiring immediate defensive measures to reduce exposure.

To mitigate CVE-2024-52406, organizations should implement the following specific measures: 1) Immediately restrict file upload functionality by enforcing strict server-side validation of file types, allowing only safe and expected formats (e.g., CSV files) and rejecting all others. 2) Implement content inspection and MIME type verification to prevent disguised malicious files from being accepted. 3) Use application-level whitelisting for file extensions and verify file contents to ensure they conform to expected CSV format. 4) Deploy web application firewalls (WAFs) with rules designed to detect and block web shell upload attempts and suspicious file uploads. 5) Isolate the CSV to html application in a sandboxed or containerized environment with minimal privileges to limit the impact of any compromise. 6) Monitor server logs and file system changes for unusual activity indicative of web shell deployment or unauthorized uploads. 7) Regularly audit and update the application and underlying server software to incorporate security patches once available. 8) If possible, disable or limit file upload features until a secure patch or update is released. 9) Educate administrators and developers about secure file handling practices and the risks of unrestricted uploads. 10) Consider network segmentation to protect critical infrastructure from compromised web servers. These targeted actions go beyond generic advice by focusing on practical controls tailored to the nature of this vulnerability.