CVE-2020-16273 : Security Advisory and Response
Discover the Armv8-M stack selection vulnerability in Arm software. Learn about the impact, affected systems, exploitation mechanism, and mitigation steps for CVE-2020-16273.
In Arm software implementing the Armv8-M processors, a vulnerability exists where the stack selection mechanism can be influenced by a stack-underflow attack in v8-M TrustZone based processors. This can allow an attacker to manipulate the stack pointer used by the Secure World from a non-secure application, affecting software based on Armv8-M processors with the Security Extension.
Understanding CVE-2020-16273
This CVE identifies a security vulnerability in Arm software that can be exploited to alter the stack pointer used by the Secure World from a non-secure application.
What is CVE-2020-16273?
The vulnerability in Arm software allows for a stack-underflow attack in v8-M TrustZone based processors, potentially enabling unauthorized manipulation of the stack pointer.
The Impact of CVE-2020-16273
The vulnerability poses a risk to the security of systems utilizing Armv8-M processors with the Security Extension, as it could lead to unauthorized changes in the stack pointer.
Technical Details of CVE-2020-16273
This section provides more technical insights into the vulnerability.
Vulnerability Description
The vulnerability arises from the stack selection mechanism in Arm software, which can be exploited by a stack-underflow attack in v8-M TrustZone based processors.
Affected Systems and Versions
- Arm software implementing Armv8-M processors (all versions)
- Software based on Armv8-M processors with the Security Extension
Exploitation Mechanism
An attacker can influence the stack pointer used by the Secure World from a non-secure application if the stack is not properly initialized.
Mitigation and Prevention
It is crucial to take immediate steps to address and prevent exploitation of this vulnerability.
Immediate Steps to Take
- Update the affected Arm software to the latest version provided by the vendor
- Ensure proper initialization of the stack to prevent unauthorized changes
Long-Term Security Practices
- Regularly monitor and update security configurations
- Implement secure coding practices to mitigate stack-related vulnerabilities
Patching and Updates
- Stay informed about security updates from Arm and apply patches promptly to address known vulnerabilities