CVE-2021-26731 Explained : Impact and Mitigation

Command injection and multiple stack-based buffer overflows vulnerabilities in the modifyUserb_func function of spx_restservice allow an attacker to execute arbitrary code with root privileges. This affects Lanner Inc IAC-AST2500A firmware version 1.10.0.

Understanding CVE-2021-26731

This CVE involves command injection and multiple stack-based buffer overflows in spx_restservice's modifyUserb_func function, posing a critical security risk.

What is CVE-2021-26731?

CVE-2021-26731 is a security vulnerability that enables an attacker to run arbitrary code with root privileges through command injection and multiple stack-based buffer overflows in Lanner Inc IAC-AST2500A firmware version 1.10.0.

The Impact of CVE-2021-26731

The impact of CVE-2021-26731 is severe, allowing malicious actors to execute code with elevated privileges, potentially leading to complete system compromise and unauthorized access.

Technical Details of CVE-2021-26731

This section provides detailed technical insights into the vulnerability.

Vulnerability Description

The vulnerability arises due to command injection and multiple stack-based buffer overflows in the modifyUserb_func function of spx_restservice, creating a pathway for unauthorized code execution.

Affected Systems and Versions

Lanner Inc IAC-AST2500A standard firmware version 1.10.0 is confirmed to be affected by this vulnerability.

Exploitation Mechanism

Malicious actors can exploit CVE-2021-26731 by injecting malicious commands and overflowing buffers, enabling them to gain unauthorized access and execute arbitrary code with root privileges.

Mitigation and Prevention

Protecting systems against CVE-2021-26731 requires immediate action and long-term security measures.

Immediate Steps to Take

Update to a patched version of the firmware immediately.
Implement network segmentation to limit the exposure of vulnerable systems.
Monitor and audit system activity for any signs of unauthorized access.

Long-Term Security Practices

Regularly update firmware and software to address security vulnerabilities.
Conduct security assessments and penetration testing to identify and remediate potential weaknesses.
Educate users and administrators on secure coding practices and common attack vectors.

Patching and Updates

Refer to the vendor's security advisory for patch releases and update schedules.