Overview
CVE-2025-30973 is a critical vulnerability that affects the CoSchool Learning Management System (LMS) developed by Codexpert, Inc. This system is widely used in educational institutions around the globe to manage and deliver educational courses, making this vulnerability a significant threat to the data security of these institutions. The vulnerability pertains to the deserialization of untrusted data, potentially leading to object injection. This security flaw is substantial as it could lead to system compromise or data leakage if exploited by malicious actors.
Vulnerability Summary
CVE ID: CVE-2025-30973
Severity: Critical (9.8 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage
Affected Products
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Product | Affected Versions
CoSchool LMS | Up to 1.4.3
How the Exploit Works
The CVE-2025-30973 exploit takes advantage of the deserialization of untrusted data in CoSchool LMS. Deserialization is the process of converting data from a flat format into an object. If the data is untrusted or manipulated by an attacker, this process can result in the injection of malicious objects into the system. In this case, the attacker could inject a malicious object that manipulates the system or accesses sensitive data, leading to system compromise or data leakage.
Conceptual Example Code
Here’s a conceptual example of a potentially malicious HTTP request exploiting this vulnerability:
POST /deserialize-object HTTP/1.1
Host: target.example.com
Content-Type: application/octet-stream
{ "serialized_object": "rO0ABXNyABdqYXZhLnV0aWwuSGFzaE1hcAUH2sHDFmDRAwACRgAKbG9hZEZhY3RvckkACXRocmVzaG9sZHhwP0AAAAAAAAx3CAAAABAAAAAAeHg=" }In this example, the serialized_object field contains a Base64 encoded serialized object, which when deserialized could lead to object injection and potential system compromise.
Mitigation
The most effective way to mitigate this vulnerability is to apply the vendor patch as soon as it’s available. In the absence of a patch, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as temporary mitigation. However, these should not be considered as permanent solutions, and the patch should be applied as soon as possible.