CVE-2020-8935 : What You Need to Know

An arbitrary memory overwrite vulnerability in Asylo versions up to 0.6.0 allows an attacker to make an Ecall_restore function call to reallocate untrusted code and overwrite sections of the Enclave memory address. Update your library to mitigate this issue.

Understanding CVE-2020-8935

This CVE involves an arbitrary memory overwrite vulnerability in Asylo versions up to 0.6.0, impacting the security of the system.

What is CVE-2020-8935?

CVE-2020-8935 is a security vulnerability in Asylo versions up to 0.6.0 that enables an attacker to overwrite sections of the Enclave memory address by exploiting the Ecall_restore function.

The Impact of CVE-2020-8935

CVSS Base Score: 5.3 (Medium Severity)
Attack Vector: Local
Attack Complexity: High
Confidentiality Impact: High
Integrity Impact: Low
Privileges Required: Low
Scope: Unchanged
User Interaction: None
Availability Impact: None

Technical Details of CVE-2020-8935

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability allows an attacker to perform arbitrary memory overwrites by manipulating the Ecall_restore function in Asylo versions up to 0.6.0.

Affected Systems and Versions

Affected Product: Asylo
Vendor: Google LLC
Affected Versions: Up to 0.6.0

Exploitation Mechanism

Attackers can exploit this vulnerability by making an Ecall_restore function call to reallocate untrusted code and overwrite sections of the Enclave memory address.

Mitigation and Prevention

To address CVE-2020-8935, follow these mitigation strategies:

Immediate Steps to Take

Update Asylo library to version 0.6.1 or higher.
Monitor for any unusual activities on the system.

Long-Term Security Practices

Regularly update software and libraries to the latest versions.
Implement secure coding practices to prevent memory overwrite vulnerabilities.

Patching and Updates

Apply patches provided by the vendor promptly to fix the vulnerability and enhance system security.