{"id":71649,"date":"2025-09-05T14:54:59","date_gmt":"2025-09-05T14:54:59","guid":{"rendered":""},"modified":"2025-09-28T11:55:33","modified_gmt":"2025-09-28T17:55:33","slug":"cve-2025-31100-unrestricted-file-upload-leads-to-web-shell-deployment-in-mojoomla-school-management","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-31100-unrestricted-file-upload-leads-to-web-shell-deployment-in-mojoomla-school-management\/","title":{"rendered":"CVE-2025-31100: Unrestricted File Upload Leads to Web Shell Deployment in Mojoomla School Management<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

The CVE-2025-31100 vulnerability is a critical issue discovered in the School Management software developed by Mojoomla. It is a flaw that allows an attacker to upload files of a dangerous type, typically a web shell, to a web server unrestrictedly. This kind of vulnerability poses a severe risk to all entities using the software, from schools to other educational institutions, as it can lead to system compromise or data<\/a> leakage. It’s imperative to understand and mitigate this vulnerability promptly due to its high-risk rating and potential<\/a> for significant damage.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-31100
\nSeverity: Critical (9.9 CVSS Score)
\nAttack Vector: Remote
\nPrivileges Required: Low
\nUser Interaction: None
\nImpact: System compromise or data<\/a> leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Mojoomla School Management | n\/a through 1.93.1<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The vulnerability primarily resides in the file upload feature of the Mojoomla School<\/a> Management software. It fails to properly validate and sanitize the types of files being uploaded<\/a> to the server. This lack of restriction allows attackers to upload a malicious<\/a> web shell file to the server. Once uploaded, this web shell can execute arbitrary commands, providing the attacker with unauthorized access to the server<\/a> and the ability to compromise the system or leak sensitive data.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

Below is an illustrative example of how this vulnerability<\/a> might be exploited. This is a conceptual HTTP request to upload a malicious web shell<\/a>.<\/p>\n

POST \/file_upload HTTP\/1.1\nHost: target.school.com\nContent-Type: multipart\/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW\n------WebKitFormBoundary7MA4YWxkTrZu0gW\nContent-Disposition: form-data; name=\"upload_file\"; filename=\"malicious_shell.php\"\nContent-Type: application\/x-php\n\n------WebKitFormBoundary7MA4YWxkTrZu0gW--<\/code><\/pre>\n
In this example, the attacker uploads a PHP web shell that executes any command passed through the ‘cmd’ HTTP request<\/a> parameter.<\/p>\n
Mitigation<\/strong><\/p>\n
The most effective way to mitigate this vulnerability is by applying the vendor’s patch. If it’s not immediately possible to apply the patch, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. These systems can be configured to block or alert on attempts to upload<\/a> potentially dangerous file types.
\nRemember, regular updates and patches are crucial to prevent potential cyber threats. Always adhere to the principle of least privilege, and avoid giving unnecessary permissions to users<\/a> or services that do not require them.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The CVE-2025-31100 vulnerability is a critical issue discovered in the School Management software developed by Mojoomla. It is a flaw that allows an attacker to upload files of a dangerous type, typically a web shell, to a web server unrestrictedly. This kind of vulnerability poses a severe risk to all entities using the software, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-71649","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t