CVE-2021-31624 : Exploit Details and Defense Strategies

A Buffer Overflow vulnerability in Tenda AC9 routers allows attackers to execute arbitrary code via a specific parameter.

Understanding CVE-2021-31624

This CVE refers to a security flaw in Tenda AC9 routers that can be exploited by attackers to run unauthorized code.

What is CVE-2021-31624?

The CVE-2021-31624 vulnerability exists in Tenda AC9 V1.0 through V15.03.05.19(6318) and AC9 V3.0 V15.03.06.42_multi routers. Attackers can leverage this flaw to execute malicious code through the urls parameter.

The Impact of CVE-2021-31624

This vulnerability can lead to serious security breaches as attackers can gain unauthorized access to the affected routers and potentially compromise the entire network.

Technical Details of CVE-2021-31624

The technical details of this CVE include:

Vulnerability Description

The vulnerability arises due to a buffer overflow issue in Tenda AC9 routers when processing the urls parameter, enabling attackers to inject and execute arbitrary code.

Affected Systems and Versions

Tenda AC9 V1.0 through V15.03.05.19(6318) and AC9 V3.0 V15.03.06.42_multi routers are impacted by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting malicious requests containing specially-crafted urls to trigger the buffer overflow and execute arbitrary code.

Mitigation and Prevention

To safeguard against CVE-2021-31624, consider the following measures:

Immediate Steps to Take

Disable remote access to the router administration interface
Monitor network traffic for any suspicious activity

Long-Term Security Practices

Regularly update router firmware to patch known vulnerabilities
Implement network segmentation to contain potential attacks

Patching and Updates

Apply security patches provided by Tenda to mitigate the vulnerability and enhance router security.