CVE-2020-15107 : Vulnerability Insights and Analysis

In openenclave before 0.10.0, enclaves that use x87 FPU operations are vulnerable to tampering by a malicious host application. This vulnerability can compromise the execution integrity of some x87 FPU operations in an enclave, potentially leading to side-channel attacks.

Understanding CVE-2020-15107

This CVE highlights a security issue in openenclave versions prior to 0.10.0, affecting enclaves utilizing x87 FPU operations.

What is CVE-2020-15107?

CVE-2020-15107 exposes a vulnerability where a malicious host application can tamper with x87 FPU operations in enclaves, violating the Linux System V Application Binary Interface (ABI) and compromising execution integrity.

The Impact of CVE-2020-15107

CVSS Score: 5.3 (Medium Severity)
Attack Complexity: High
Attack Vector: Local
Integrity Impact: High
Privileges Required: Low
User Interaction: Required

Technical Details of CVE-2020-15107

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability allows a malicious host application to tamper with x87 FPU operations in enclaves, potentially compromising execution integrity and enabling side-channel attacks.

Affected Systems and Versions

Affected Product: openenclave
Affected Versions: < 0.10.0

Exploitation Mechanism

The vulnerability arises from the improper handling of x87 FPU operations in enclaves, allowing a malicious host application to interfere with enclave operations.

Mitigation and Prevention

Protecting systems from CVE-2020-15107 involves immediate actions and long-term security practices.

Immediate Steps to Take

Upgrade to version 0.10.0 or later of openenclave
Recompile applications against patched libraries

Long-Term Security Practices

Regularly update software and libraries
Implement secure coding practices

Patching and Updates

Ensure all systems are updated to openenclave version 0.10.0 or above to mitigate the vulnerability.