CVE-2020-8943 : Security Advisory and Response

An arbitrary memory read vulnerability in Asylo versions up to 0.6.0 allows an untrusted attacker to exploit the enc_untrusted_recvfrom function, potentially leading to memory disclosure within secure enclaves.

Understanding CVE-2020-8943

This CVE involves an unchecked buffer overrun in the Asylo software, impacting versions up to 0.6.0.

What is CVE-2020-8943?

CVE-2020-8943 is a vulnerability in Asylo that enables an attacker to read memory locations beyond the intended buffer size, including sensitive data within secure enclaves.

The Impact of CVE-2020-8943

The vulnerability poses a medium severity risk with high confidentiality impact, allowing attackers to potentially access privileged information.

Technical Details of CVE-2020-8943

This section provides detailed technical insights into the vulnerability.

Vulnerability Description

The vulnerability arises from an unchecked parameter size in the enc_untrusted_recvfrom function, enabling unauthorized memory reads.

Affected Systems and Versions

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

Exploitation Mechanism

Attack Complexity: High
Attack Vector: Local
Privileges Required: Low
User Interaction: None
Scope: Unchanged
Vector String: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N

Mitigation and Prevention

Protecting systems from CVE-2020-8943 requires immediate actions and long-term security practices.

Immediate Steps to Take

Upgrade Asylo software past commit 6e158d558abd3c29a0208e30c97c9a8c5bd4230f

Long-Term Security Practices

Regularly update software to the latest versions
Implement secure coding practices to prevent buffer overflows

Patching and Updates

Apply patches provided by the vendor to address the vulnerability