Overview
The vulnerability in focus, CVE-2025-45784, is a critical security flaw found in D-Link DPH-400S/SE VoIP Phone v1.01. The device contains hardcoded provisioning variables, which include sensitive user credentials like PROVIS_USER_PASSWORD. This vulnerability is dangerous as it could potentially expose sensitive user data and allow unauthorized access to device functions or user accounts.
This vulnerability is particularly relevant to organizations and individuals who use the affected D-Link VoIP phone. In the wrong hands, this vulnerability can lead to serious security breaches, including system compromise and data leakage. Thus, it is crucial to understand the nature of this vulnerability and take appropriate measures to mitigate its impact.
Vulnerability Summary
CVE ID: CVE-2025-45784
Severity: Critical (9.8 CVSS Score)
Attack Vector: Local
Privileges Required: None
User Interaction: None
Impact: Unauthorized access to device functions or user accounts, potential system compromise or data leakage
Affected Products
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Product | Affected Versions
D-Link DPH-400S/SE VoIP Phone | v1.01
How the Exploit Works
An attacker with access to the firmware image can extract the hardcoded credentials using static analysis tools such as strings or xxd. These tools can scan the firmware binary to identify and extract strings that resemble user credentials. Once the attacker has these credentials, they can potentially gain unauthorized access to device functions or user accounts.
Conceptual Example Code
Given below is a
conceptual
example using the `strings` command in Linux to extract the hardcoded credentials from the firmware image:
$ strings firmware_image.bin | grep PROVIS_USER_PASSWORDThis command scans the binary file firmware_image.bin and searches for the string “PROVIS_USER_PASSWORD. If the hardcoded credentials are present, this command will output them to the console.
Mitigation Guidance
To protect against this vulnerability, users of the affected D-Link VoIP Phone should apply the vendor’s patch as soon as possible. If a patch is not available or cannot be applied immediately, a web application firewall (WAF) or an intrusion detection system (IDS) can be used as a temporary measure to detect and block exploitation attempts. Furthermore, organizations should follow best practices for firmware security, including regularly updating firmware and minimizing the use of hardcoded credentials.