CVE-2021-33316 Explained : Impact and Mitigation

This CVE-2021-33316 article provides an overview of a critical integer underflow vulnerability found in TRENDnet TI-PG1284i switch(hw v2.0R) prior to version 2.0.2.S0. The vulnerability exists in the lldp related component, leading to potential buffer overflow or invalid memory access when exploited.

Understanding CVE-2021-33316

This section delves into the details of CVE-2021-33316, highlighting its impact and technical aspects.

What is CVE-2021-33316?

The TRENDnet TI-PG1284i switch(hw v2.0R) before version 2.0.2.S0 is affected by an integer underflow vulnerability in the lldp component due to improper validation of the length field in ChassisID TLV. Adversaries can trigger an integer underflow by sending a specifically crafted lldp packet to the device, leading to potential buffer overflow or invalid memory access.

The Impact of CVE-2021-33316

Exploiting this vulnerability could result in unauthorized access to the system, denial of service, or even remote code execution, posing a significant threat to the device and the network it is connected to.

Technical Details of CVE-2021-33316

This section provides in-depth technical insights into the vulnerability, including its description, affected systems and versions, and exploitation mechanism.

Vulnerability Description

The integer underflow vulnerability in TRENDnet TI-PG1284i switch(hw v2.0R) is triggered by improper length field validation in the ChassisID TLV of the lldp component. Upon successful exploitation, a negative number is passed to memcpy() function, potentially leading to buffer overflow or memory corruption.

Affected Systems and Versions

The vulnerability affects TRENDnet TI-PG1284i switch(hw v2.0R) devices running firmware versions prior to 2.0.2.S0, making them susceptible to exploitation if not updated.

Exploitation Mechanism

By sending a crafted lldp packet with a malicious payload to the vulnerable device, threat actors can trigger the integer underflow condition, leading to further exploitation and potential compromise.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-33316, immediate actions, long-term security practices, and the importance of timely patching and updates are discussed.

Immediate Steps to Take

Immediately update the affected TRENDnet TI-PG1284i switch(hw v2.0R) devices to version 2.0.2.S0 or later to remediate the vulnerability and prevent potential exploitation.

Long-Term Security Practices

Adopting robust network security measures, regular vulnerability assessments, and ensuring proper input validation can enhance the overall security posture and prevent similar vulnerabilities in the future.

Patching and Updates

Regularly monitor vendor releases for security patches and updates, apply security best practices, and prioritize timely firmware updates to address known vulnerabilities and enhance device security.