CVE-2020-28349 : Exploit Details and Defense Strategies

ChirpStack Network Server 3.9.0 is affected by an inaccurate frame deduplication process that allows a malicious gateway to conduct uplink Denial of Service attacks. This CVE raises concerns about network security when untrusted LoRa gateways are permitted access.

Understanding CVE-2020-28349

This CVE highlights a vulnerability in ChirpStack Network Server 3.9.0 that can be exploited by a malicious gateway to disrupt uplink communications.

What is CVE-2020-28349?

The vulnerability in ChirpStack Network Server 3.9.0 enables a malicious gateway to trigger uplink Denial of Service attacks by utilizing malformed frequency attributes in the CollectAndCallOnceCollect function in internal/uplink/collect.go.

The Impact of CVE-2020-28349

The exploitation of this vulnerability can lead to a disruption in uplink communications, potentially affecting the availability and reliability of the network. The vendor's stance on network security with untrusted LoRa gateways further emphasizes the critical nature of this issue.

Technical Details of CVE-2020-28349

ChirpStack Network Server 3.9.0 is susceptible to a specific vulnerability that can be exploited by a malicious gateway.

Vulnerability Description

The inaccurate frame deduplication process in ChirpStack Network Server 3.9.0 allows for uplink Denial of Service attacks through malformed frequency attributes.

Affected Systems and Versions

Product: ChirpStack Network Server 3.9.0
Vendor: ChirpStack
Version: 3.9.0

Exploitation Mechanism

The vulnerability can be exploited by sending malformed frequency attributes in the CollectAndCallOnceCollect function.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent the exploitation of CVE-2020-28349.

Immediate Steps to Take

Apply vendor patches and updates promptly.
Implement network segmentation to restrict access.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Conduct regular security assessments and audits.
Educate network administrators and users on best security practices.

Patching and Updates

Stay informed about security advisories from the vendor.
Regularly update and patch ChirpStack Network Server to mitigate vulnerabilities.