CVE-2021-33315 : What You Need to Know

A detailed analysis of CVE-2021-33315 highlighting the vulnerability found in the TRENDnet TI-PG1284i switch hardware version 2.0R.

Understanding CVE-2021-33315

CVE-2021-33315 is an integer underflow vulnerability present in the TRENDnet TI-PG1284i switch prior to version 2.0.2.S0. The vulnerability resides in the lldp related component of the device.

What is CVE-2021-33315?

The vulnerability arises due to inadequate validation on the length field of PortID TLV. An attacker can exploit this by sending a carefully crafted lldp packet to trigger an integer underflow, eventually causing a negative number to be passed to memcpy(), leading to possible buffer overflow or memory access issues.

The Impact of CVE-2021-33315

This security flaw could be exploited by malicious actors to execute arbitrary code, perform denial of service attacks, or gain unauthorized access to the affected system. It poses a significant risk to the integrity and confidentiality of data stored on the vulnerable device.

Technical Details of CVE-2021-33315

Below are specific technical details regarding CVE-2021-33315:

Vulnerability Description

The vulnerability in TRENDnet TI-PG1284i switch(hw v2.0R) arises from an integer underflow in the length field of PortID TLV due to lack of proper validation.

Affected Systems and Versions

The issue affects TRENDnet TI-PG1284i switches with hardware version 2.0R prior to version 2.0.2.S0.

Exploitation Mechanism

By sending a carefully crafted lldp packet to the device, an attacker can trigger an integer underflow leading to potential buffer overflow or invalid memory access.

Mitigation and Prevention

To safeguard systems against CVE-2021-33315, follow these security measures:

Immediate Steps to Take

Apply vendor-supplied patches or updates that address the vulnerability.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update and patch all network-connected devices.
Implement network segmentation to restrict access to critical systems.
Conduct regular security audits and assessments.

Patching and Updates

Stay informed about security updates released by TRENDnet and promptly apply patches to ensure protection against known vulnerabilities.