CVE-2017-7563 : Security Advisory and Response

ARM Trusted Firmware version 1.3 presents a vulnerability where read-only memory (RO memory) can be executed in AArch64 Secure EL1, bypassing the MT_EXECUTE_NEVER protection mechanism due to an inconsistency in the number of execute-never bits.

Understanding CVE-2017-7563

In ARM Trusted Firmware 1.3, a security flaw allows attackers to execute RO memory in AArch64 Secure EL1, compromising the MT_EXECUTE_NEVER protection.

What is CVE-2017-7563?

The vulnerability in ARM Trusted Firmware version 1.3 enables the execution of RO memory in AArch64 Secure EL1, circumventing the MT_EXECUTE_NEVER protection mechanism.

The Impact of CVE-2017-7563

This vulnerability allows attackers to bypass security measures and execute read-only memory in a secure environment, potentially leading to unauthorized access and control.

Technical Details of CVE-2017-7563

ARM Trusted Firmware version 1.3 vulnerability details.

Vulnerability Description

The issue arises from an inconsistency in the number of execute-never bits, allowing RO memory execution in AArch64 Secure EL1.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Version: Not applicable

Exploitation Mechanism

Attackers exploit the discrepancy in execute-never bits to execute RO memory in AArch64 Secure EL1.

Mitigation and Prevention

Steps to mitigate and prevent the CVE-2017-7563 vulnerability.

Immediate Steps to Take

Apply patches or updates provided by ARM to address the vulnerability.
Monitor security advisories for any new information or patches related to this issue.

Long-Term Security Practices

Regularly update firmware and software to ensure the latest security patches are in place.
Implement secure coding practices to prevent similar vulnerabilities in the future.

Patching and Updates

ARM may release patches or updates to fix the vulnerability; ensure timely installation to secure systems.