CVE-2020-27485 : What You Need to Know
Learn about CVE-2020-27485 affecting Garmin Forerunner 235 before 8.20. Understand the impact, exploitation mechanism, and mitigation steps for this ConnectIQ TVM array index error vulnerability.
Garmin Forerunner 235 before 8.20 is affected by an Array index error in the ConnectIQ TVM component. The vulnerability allows an attacker to upload a malicious ConnectIQ application to the ConnectIQ store, leading to memory read/write outside the TVM context allocation.
Understanding CVE-2020-27485
This CVE involves an array index error in the ConnectIQ TVM component of Garmin Forerunner 235, potentially enabling unauthorized memory access.
What is CVE-2020-27485?
The vulnerability in Garmin Forerunner 235 before 8.20 allows attackers to exploit a flaw in the ConnectIQ program interpreter, enabling them to read and write memory beyond the TVM context allocation.
The Impact of CVE-2020-27485
Exploiting this vulnerability could result in a use-after-free scenario, granting unauthorized access to the MAX32630 address space and allowing malicious activities outside the application execution environment.
Technical Details of CVE-2020-27485
This section provides detailed technical insights into the CVE.
Vulnerability Description
The ConnectIQ program interpreter fails to validate the index provided during local variable access, enabling memory manipulation beyond the TVM context allocation.
Affected Systems and Versions
- Product: Garmin Forerunner 235
- Versions: Before 8.20
Exploitation Mechanism
- Attack Vector: Uploading a malicious ConnectIQ application to the ConnectIQ store
- Vulnerability: Array index error in the ConnectIQ TVM component
- Consequence: Unauthorized memory read/write outside TVM context allocation
Mitigation and Prevention
Protecting systems from CVE-2020-27485 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Update Garmin Forerunner 235 to version 8.20 or later
- Avoid downloading and installing untrusted ConnectIQ applications
Long-Term Security Practices
- Regularly monitor Garmin security advisories for updates
- Implement secure coding practices for ConnectIQ applications
Patching and Updates
- Apply patches and firmware updates provided by Garmin to address the vulnerability