CVE-2021-27208 : Security Advisory and Response
Explore the details of CVE-2021-27208, a vulnerability in the Zynq-7000 SOC NAND driver that could allow arbitrary code execution. Learn about impacts, affected systems, exploitation mechanisms, and mitigation measures.
This CVE-2021-27208 involves a vulnerability in the nand driver of Zynq-7000 SOC devices when booting from nand flash memory. An attacker with physical access to the device could trigger a buffer overflow during the reading of parameters, potentially leading to arbitrary code execution.
Understanding CVE-2021-27208
This section delves into the details of the CVE-2021-27208 vulnerability.
What is CVE-2021-27208?
The vulnerability occurs in the nand driver of Zynq-7000 SOC devices when reading parameters from the nand's parameter page. If an overly large field is read, a buffer overflow can be triggered, creating an opportunity for arbitrary code execution.
The Impact of CVE-2021-27208
Successful exploitation of this vulnerability requires physical access to the Zynq-7000 SoC device for replacing the original NAND flash memory with an emulation device. The attacker can then execute arbitrary code, posing a significant risk to the device's security.
Technical Details of CVE-2021-27208
In this section, we explore the technical aspects of CVE-2021-27208.
Vulnerability Description
The vulnerability arises due to the lack of input validation in the nand driver, leading to a buffer overflow during parameter reading and allowing for arbitrary code execution.
Affected Systems and Versions
The affected systems include Zynq-7000 SOC devices booting from nand flash memory. The specific affected versions are not provided in the data.
Exploitation Mechanism
To exploit this vulnerability, the attacker needs physical access to the Zynq-7000 SOC device to replace the original NAND flash memory with an emulation device.
Mitigation and Prevention
In this section, we discuss the steps to mitigate and prevent the exploitation of CVE-2021-27208.
Immediate Steps to Take
Immediate measures involve restricting physical access to the device and implementing stringent access controls to prevent unauthorized modifications.
Long-Term Security Practices
Long-term security practices include regularly updating and patching the device's firmware and software to address known vulnerabilities and enhance overall security.
Patching and Updates
Vendors should release patches that address the input validation issue in the nand driver to prevent buffer overflows and mitigate the risks associated with arbitrary code execution.