CVE-2023-40839 : Exploit Details and Defense Strategies

This article provides detailed information about CVE-2023-40839, a vulnerability in Tenda AC6 US_AC6V1.0BR_V15.03.05.16_multi_TD01.bin that allows command execution.

Understanding CVE-2023-40839

This section delves into the specifics of the vulnerability and its impact.

What is CVE-2023-40839?

The vulnerability in Tenda AC6 US_AC6V1.0BR_V15.03.05.16_multi_TD01.bin allows attackers to execute commands by manipulating certain fields within the 'formSetIptv' function.

The Impact of CVE-2023-40839

The impact of this vulnerability is significant as it can be leveraged by attackers to execute unauthorized commands on the affected system.

Technical Details of CVE-2023-40839

In this section, we discuss the technical aspects of the vulnerability.

Vulnerability Description

The 'sub_ADF3C' function within 'formSetIptv' does not adequately filter the 'list' and 'vlanId' fields, enabling command execution by passing these fields as parameters.

Affected Systems and Versions

All versions of Tenda AC6 US_AC6V1.0BR_V15.03.05.16_multi_TD01.bin are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting malicious input to the 'list' and 'vlanId' fields, thereby executing unauthorized commands.

Mitigation and Prevention

This section provides guidance on mitigating the risks associated with CVE-2023-40839.

Immediate Steps to Take

Users are advised to restrict access to the affected system and implement firewall rules to limit exposure to potential exploitation.

Long-Term Security Practices

Regularly updating systems and implementing security best practices can help prevent such vulnerabilities in the future.

Patching and Updates

It is crucial to apply security patches provided by the vendor to remediate the vulnerability effectively.