CVE-2021-25849 : Exploit Details and Defense Strategies

An integer underflow vulnerability has been identified in userdisk/vport_lldpd in Moxa Camera VPort 06EC-2V Series. This flaw in version 1.1 could allow attackers to trigger Denial of Service (DoS) by sending a specially crafted lldp packet.

Understanding CVE-2021-25849

This section provides insights into the impact and technical details of the CVE.

What is CVE-2021-25849?

The CVE-2021-25849 refers to an integer underflow vulnerability present in Moxa Camera VPort 06EC-2V Series, version 1.1, specifically in userdisk/vport_lldpd. The issue arises from inadequate validation of the PortID TLV, enabling attackers to disrupt the system's service availability by exploiting this flaw.

The Impact of CVE-2021-25849

The impact of this vulnerability is the potential for a Denial of Service attack. By leveraging a specially crafted lldp packet, threat actors can exploit the flawed PortID TLV validation. Consequently, the affected Moxa Camera VPort 06EC-2V Series device may become unresponsive, impacting its normal functionality.

Technical Details of CVE-2021-25849

This section elaborates on the vulnerability, affected systems, versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability arises from an integer underflow in userdisk/vport_lldpd, affecting Moxa Camera VPort 06EC-2V Series, version 1.1. Improper verification of the PortID TLV in incoming lldp packets can be manipulated by threat actors to execute a DoS attack.

Affected Systems and Versions

The impacted system is the Moxa Camera VPort 06EC-2V Series with version 1.1. Users utilizing this specific version are at risk of exploitation through crafted lldp packets.

Exploitation Mechanism

By sending maliciously crafted lldp packets with the intention of triggering an integer underflow in the PortID TLV validation process, cybercriminals can execute a DoS attack on vulnerable Moxa Camera VPort 06EC-2V Series devices.

Mitigation and Prevention

Outlined are the necessary steps to address and prevent exploitation of CVE-2021-25849.

Immediate Steps to Take

Users should apply the provided patches or updates from Moxa to address the identified vulnerability promptly. It is critical to implement these measures to mitigate the risk of DoS attacks targeting the affected devices.

Long-Term Security Practices

In addition to immediate patching, maintaining robust cybersecurity practices, such as segmenting network access, monitoring for suspicious network activity, and keeping systems up to date, can enhance the overall security posture.

Patching and Updates

Regularly check for security advisories and updates from Moxa regarding the Moxa Camera VPort 06EC-2V Series. Timely application of patches can help safeguard against known vulnerabilities and potential cyber threats.