Unrestricted File Upload in Dcat-Admin up to 2.2.3-beta

Executive Summary

This vulnerability exists in Dcat-Admin up to version 2.2.3-beta, specifically in the editorMDUpload function of the /admin/dcat-api/editor-md/upload file within the User Setting Page component.

The issue is caused by manipulation of the argument editormd-image-file, which leads to unrestricted file upload.

An attacker can exploit this vulnerability remotely, and the exploit code has been publicly disclosed.

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Impact Analysis

The unrestricted file upload vulnerability allows an attacker to upload arbitrary files to the server.

This can lead to potential compromise of the system, including executing malicious code, defacing the website, or gaining unauthorized access.

Since the attack can be initiated remotely, it increases the risk of exploitation without requiring physical access.

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Detection Guidance

This vulnerability involves unrestricted file upload via the editormd-image-file argument in the /admin/dcat-api/editor-md/upload endpoint. To detect it on your system or network, you can monitor HTTP requests targeting this specific URL path and check for suspicious or unexpected file upload attempts.

You can use network monitoring tools or web server logs to identify requests to /admin/dcat-api/editor-md/upload that include the editormd-image-file parameter.

Example commands to detect such activity might include:

• Using grep on web server logs to find upload attempts: grep "/admin/dcat-api/editor-md/upload" /var/log/nginx/access.log
• Using tcpdump to capture HTTP POST requests to the vulnerable endpoint: tcpdump -A -s 0 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' | grep "/admin/dcat-api/editor-md/upload"
• Using curl to test the endpoint manually by attempting to upload a file via the editormd-image-file parameter.

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Mitigation Strategies

To mitigate this vulnerability immediately, you should restrict or disable access to the /admin/dcat-api/editor-md/upload endpoint until a patch or update is applied.

Additional steps include:

• Implement strict access controls to ensure only authorized users can access the upload functionality.
• Apply input validation and file type restrictions on uploaded files to prevent malicious uploads.
• Monitor logs for suspicious upload attempts and block offending IP addresses.
• Upgrade Dcat-Admin to a version later than 2.2.3-beta where this vulnerability is fixed, once available.

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