CVE-2020-16146 Explained : Impact and Mitigation
Learn about CVE-2020-16146, a buffer overflow vulnerability in Espressif ESP-IDF versions 2.x, 3.x, and 4.x. Understand the impact, affected systems, exploitation, and mitigation steps.
Espressif ESP-IDF versions 2.x, 3.0.x through 3.0.9, 3.1.x through 3.1.7, 3.2.x through 3.2.3, 3.3.x through 3.3.2, and 4.0.x through 4.0.1 are affected by a Buffer Overflow vulnerability in BluFi provisioning. Attackers can exploit this issue by sending a specially crafted BluFi protocol command, leading to a buffer overflow.
Understanding CVE-2020-16146
This CVE identifies a specific vulnerability in the Espressif ESP-IDF software development framework.
What is CVE-2020-16146?
The vulnerability lies in the btc_blufi_recv_handler function in blufi_prf.c, allowing attackers to trigger a buffer overflow by sending a manipulated BluFi protocol Write Attribute command to characteristic 0xFF01.
The Impact of CVE-2020-16146
Exploiting this vulnerability can result in unauthorized access, denial of service, or arbitrary code execution on devices running the affected versions of ESP-IDF.
Technical Details of CVE-2020-16146
Espressif ESP-IDF is susceptible to a buffer overflow vulnerability in the BluFi provisioning process.
Vulnerability Description
The issue occurs in the btc_blufi_recv_handler function in blufi_prf.c, enabling attackers to overflow the buffer by sending a crafted BluFi protocol command.
Affected Systems and Versions
- Versions 2.x, 3.0.x through 3.0.9
- Versions 3.1.x through 3.1.7
- Versions 3.2.x through 3.2.3
- Versions 3.3.x through 3.3.2
- Versions 4.0.x through 4.0.1
Exploitation Mechanism
Attackers can exploit this vulnerability by sending a specially crafted BluFi protocol Write Attribute command to characteristic 0xFF01, causing a buffer overflow.
Mitigation and Prevention
To address CVE-2020-16146, follow these mitigation strategies:
Immediate Steps to Take
- Update to the latest version of ESP-IDF that includes a patch for this vulnerability.
- Implement network segmentation to limit the impact of potential attacks.
Long-Term Security Practices
- Regularly monitor and audit network traffic for any suspicious activities.
- Conduct security training for developers to enhance awareness of secure coding practices.
Patching and Updates
- Stay informed about security advisories from Espressif and apply patches promptly to mitigate known vulnerabilities.