CVE-2020-27890 : What You Need to Know
Learn about CVE-2020-27890, a vulnerability in the Zigbee protocol implementation on Texas Instruments CC2538 devices with Z-Stack 3.0.1, potentially leading to a denial of service (DoS) condition. Find out about affected systems, exploitation details, and mitigation steps.
Texas Instruments CC2538 devices with Z-Stack 3.0.1 are vulnerable to a specific Zigbee protocol implementation issue.
Understanding CVE-2020-27890
This CVE involves a vulnerability in the Zigbee protocol implementation on Texas Instruments CC2538 devices with Z-Stack 3.0.1.
What is CVE-2020-27890?
The Zigbee protocol implementation on Texas Instruments CC2538 devices with Z-Stack 3.0.1 fails to properly process a ZCL Write Attributes No Response message, leading to a crash in zclParseInWriteCmd() without updating the specific attribute's value.
The Impact of CVE-2020-27890
This vulnerability can be exploited to cause a denial of service (DoS) condition on affected devices, potentially disrupting their normal operation.
Technical Details of CVE-2020-27890
Texas Instruments CC2538 devices with Z-Stack 3.0.1 are susceptible to the following:
Vulnerability Description
The vulnerability arises from the improper handling of ZCL Write Attributes No Response messages, resulting in a crash within zclParseInWriteCmd() and failure to update the attribute's value.
Affected Systems and Versions
- Product: Not applicable
- Vendor: Not applicable
- Versions: Z-Stack 3.0.1
Exploitation Mechanism
Attackers can exploit this vulnerability by sending specially crafted ZCL Write Attributes No Response messages to the affected devices, triggering the crash in zclParseInWriteCmd() and causing the attribute's value not to be updated.
Mitigation and Prevention
To address CVE-2020-27890, consider the following mitigation strategies:
Immediate Steps to Take
- Implement network segmentation to isolate vulnerable devices.
- Monitor network traffic for any suspicious activity.
Long-Term Security Practices
- Regularly update firmware and software to patch known vulnerabilities.
- Conduct security assessments and penetration testing to identify and address potential weaknesses.
Patching and Updates
- Texas Instruments may release patches or updates to address this vulnerability. Stay informed about security advisories and apply patches promptly.