CVE-2021-45993 : Security Advisory and Response

Tenda routers G1 and G3 v15.11.0.17(9502)_CN were found to have a stack overflow vulnerability, potentially leading to a Denial of Service (DoS) attack.

Understanding CVE-2021-45993

This CVE pertains to a stack overflow vulnerability in Tenda routers G1 and G3 v15.11.0.17(9502)_CN, which could be exploited to trigger a DoS attack.

What is CVE-2021-45993?

The vulnerability lies in the function formIPMacBindModify of the mentioned routers, enabling attackers to disrupt services by manipulating specific parameters.

The Impact of CVE-2021-45993

Exploitation of this vulnerability could result in a DoS scenario, causing service interruptions and potentially affecting network availability.

Technical Details of CVE-2021-45993

This section outlines the technical aspects of the CVE.

Vulnerability Description

The vulnerability stems from a stack overflow in the formIPMacBindModify function of Tenda routers G1 and G3 v15.11.0.17(9502)_CN, facilitating a DoS attack.

Affected Systems and Versions

Product: Tenda routers G1 and G3 v15.11.0.17(9502)_CN
Vendor: Tenda
Versions: All versions are affected

Exploitation Mechanism

Attackers can exploit the vulnerability by manipulating the IPMacBindRuleIP and IPMacBindRuleMac parameters, triggering a stack overflow and potentially leading to a DoS situation.

Mitigation and Prevention

Protecting against CVE-2021-45993 entails taking immediate and long-term security measures.

Immediate Steps to Take

Apply vendor-supplied patches or updates promptly to mitigate the vulnerability.
Implement network segmentation to limit the impact of potential attacks.
Monitor network traffic for any suspicious activity that could indicate exploitation.

Long-Term Security Practices

Regularly update and patch all network devices to address known vulnerabilities.
Conduct routine security audits to identify and remediate security gaps proactively.
Educate network users on best practices for identifying and reporting security incidents.
Keep abreast of security advisories and follow best practices recommended by the vendor.

Patching and Updates

Vendor patches or firmware updates should be applied as soon as they are made available to remediate the vulnerability.