CVE-2021-41614 : Exploit Details and Defense Strategies

An issue was discovered in the controller unit of the OpenRISC mor1kx processor where read/write access permissions to the Exception Program Counter Register (EPCR) are not correctly implemented, allowing unauthorized privilege levels to access EPCR.

Understanding CVE-2021-41614

What is CVE-2021-41614?

CVE-2021-41614 is a vulnerability in the OpenRISC mor1kx processor's controller unit that allows user programs from unauthorized privilege levels to perform read/write accesses to the Exception Program Counter Register (EPCR).

The Impact of CVE-2021-41614

This vulnerability can lead to unauthorized access to critical system registers, potentially enabling malicious actors to execute privileged operations or disrupt the system's normal functioning.

Technical Details of CVE-2021-41614

Vulnerability Description

The issue lies in the incorrect implementation of read/write access permissions to the EPCR in the OpenRISC mor1kx processor's controller unit.

Affected Systems and Versions

Vendor: n/a
Product: n/a
Versions: all affected

Exploitation Mechanism

Attackers can leverage this vulnerability to access and manipulate the EPCR from unauthorized privilege levels, potentially leading to unauthorized system changes or disruptions.

Mitigation and Prevention

Immediate Steps to Take

Monitor vendor communications for patches or workarounds.
Implement least privilege principles to restrict access levels.
Regularly review and update access control settings.

Long-Term Security Practices

Conduct regular security audits and code reviews.
Promote security awareness training among system users.

Patching and Updates

Apply patches or updates provided by the vendor to address the vulnerability and ensure the correct implementation of access permissions to critical system registers.