CVE-2020-25757 : Vulnerability Insights and Analysis

A lack of input validation and access controls in Lua CGIs on D-Link DSR VPN routers may result in arbitrary input being passed to system command APIs, leading to arbitrary command execution with root privileges. This vulnerability affects DSR-150, DSR-250, DSR-500, and DSR-1000AC with firmware versions 3.14 and 3.17.

Understanding CVE-2020-25757

This CVE identifies a critical security issue in D-Link DSR VPN routers that could allow attackers to execute arbitrary commands with elevated privileges.

What is CVE-2020-25757?

The vulnerability stems from inadequate input validation and access control mechanisms in Lua CGIs on the affected D-Link routers, enabling malicious actors to manipulate system command APIs.

The Impact of CVE-2020-25757

Exploitation of this vulnerability could result in unauthorized execution of commands with root privileges, potentially leading to complete system compromise and unauthorized access to sensitive data.

Technical Details of CVE-2020-25757

This section delves into the specific technical aspects of the CVE.

Vulnerability Description

The lack of proper input validation and access controls in Lua CGIs on D-Link DSR VPN routers allows for the execution of arbitrary commands with root privileges.

Affected Systems and Versions

D-Link DSR-150, DSR-250, DSR-500, and DSR-1000AC
Firmware versions 3.14 and 3.17

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting arbitrary input into system command APIs through Lua CGIs, enabling the execution of unauthorized commands with elevated privileges.

Mitigation and Prevention

Protecting systems from CVE-2020-25757 requires immediate action and long-term security measures.

Immediate Steps to Take

Update affected D-Link DSR VPN routers to the latest firmware version that includes security patches.
Implement strong access controls and input validation mechanisms to mitigate the risk of arbitrary command execution.

Long-Term Security Practices

Regularly monitor and audit system logs for any suspicious activities that could indicate exploitation attempts.
Conduct security training for system administrators to enhance awareness of potential vulnerabilities and best practices.

Patching and Updates

Stay informed about security bulletins and updates from D-Link to promptly address any new vulnerabilities and apply patches to secure the network infrastructure.