Overview
A critical vulnerability, labeled CVE-2025-4843, has been identified in the firmware of D-Link DCS-932L 2.18.01, affecting the function SubUPnPCSInit of the file /sbin/udev. The vulnerability arises from a stack-based buffer overflow, triggered by improper handling of the argument CameraName. This specific flaw allows attackers to remotely compromise systems and potentially lead to data leakage.
This vulnerability is of significant concern as it affects a widely used product that is no longer supported by the maintainer. This means that many active devices could be vulnerable and the existing user base may lack the resources to deal with the issue effectively.
Vulnerability Summary
CVE ID: CVE-2025-4843
Severity: Critical (8.8 CVSS Score)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage
Affected Products
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Product | Affected Versions
D-Link DCS-932L | 2.18.01
How the Exploit Works
The vulnerability stems from a stack-based buffer overflow in the SubUPnPCSInit function of the file /sbin/udev. The function does not properly handle the CameraName argument, which can be manipulated by attackers to overflow the buffer. This can lead to arbitrary code execution, potentially granting the attacker full control of the system.
Conceptual Example Code
The following pseudocode demonstrates how an attacker might exploit this vulnerability:
POST /SubUPnPCSInit HTTP/1.1
Host: target_device_ip
Content-Type: application/json
{ "CameraName": "A" * 5000 } // Send a CameraName argument longer than the buffer can handleIn this conceptual example, a HTTP request is made to the vulnerable endpoint on the target device with a CameraName argument that is longer than the buffer is designed to handle. This causes a buffer overflow, potentially leading to arbitrary code execution.
Mitigation Guidance
Users affected by this vulnerability are urged to apply the vendor-provided patch as soon as possible. If a patch cannot be applied immediately, users should consider implementing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation measure. It is strongly recommended to replace or upgrade the affected devices to versions that are currently supported by the manufacturer.