Executive Summary

CVE-2023-53974 is a vulnerability in the D-Link DSL-124 Wireless N300 ADSL2+ router firmware ME_1.00 that allows unauthenticated attackers to send a specific POST request to the router's configuration endpoint and download a complete backup configuration file. This file contains sensitive network credentials and system configuration details. The vulnerability exists because the router does not properly verify user sessions or restrict access to this backup functionality, enabling remote attackers to retrieve critical configuration data without any authentication or user interaction. [1, 2]

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Impact Analysis

This vulnerability can have a significant impact by exposing sensitive network credentials such as WLAN WPA pre-shared keys and other system configurations to unauthorized attackers. With this information, attackers can potentially compromise the network, gain unauthorized access, and manipulate router settings. Since the attack requires no privileges or user interaction and can be performed remotely, it poses a high risk of unauthorized access and network compromise. [1, 2]

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Detection Guidance

This vulnerability can be detected by sending a specific POST request to the router's configuration endpoint and checking if the router responds with a backup configuration file. For example, you can use the following curl command to test if the device is vulnerable: curl -X POST http://<router-ip>/form2saveConf.cgi -d "submit.htm?saveconf.htm=Back+Settings" -o config.img If the response is a file named config.img containing router configuration data, the device is vulnerable. [2]

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Mitigation Strategies

Immediate mitigation steps include restricting access to the router's configuration endpoint by implementing proper authentication and access controls, updating the router firmware if a patch is available, and limiting network exposure of the device by placing it behind a firewall or restricting remote access. Additionally, changing all sensitive credentials after mitigation is recommended to prevent unauthorized access using leaked configuration data. [1, 2]

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Compliance Impact

This vulnerability allows unauthenticated attackers to retrieve sensitive network credentials and system configurations from the router, potentially leading to unauthorized access and data exposure. Such exposure of sensitive information could result in non-compliance with data protection standards and regulations like GDPR and HIPAA, which require safeguarding of sensitive data and network security. Therefore, the vulnerability poses a risk to compliance by enabling unauthorized disclosure of sensitive configuration data. [1, 2]

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