CVE-2020-8936 Explained : Impact and Mitigation
Learn about CVE-2020-8936, an arbitrary memory overwrite vulnerability in Asylo versions up to 0.6.0, allowing attackers to read memory values within the enclave. Find mitigation steps and long-term security practices here.
An arbitrary memory overwrite vulnerability in Asylo versions up to 0.6.0 allows an attacker to read memory values from within the enclave.
Understanding CVE-2020-8936
This CVE involves an arbitrary enclave memory overwrite vulnerability in ECall ecall_restore.
What is CVE-2020-8936?
- An arbitrary memory overwrite vulnerability in Asylo versions up to 0.6.0
- Allows an attacker to make a host call to UntrustedCall, leading to reading memory values within the enclave
The Impact of CVE-2020-8936
- CVSS Score: 5.3 (Medium)
- Attack Complexity: High
- Attack Vector: Local
- Confidentiality Impact: High
- Integrity Impact: Low
- Privileges Required: Low
Technical Details of CVE-2020-8936
This section provides more technical insights into the vulnerability.
Vulnerability Description
- Arbitrary memory overwrite vulnerability in Asylo versions up to 0.6.0
- Allows an attacker to read memory values from within the enclave
Affected Systems and Versions
- Affected Product: Asylo
- Vendor: Google LLC
- Affected Version: 0.6.0
Exploitation Mechanism
- Attacker can make a host call to UntrustedCall
- UntrustedCall fails to validate buffer range within sgx_params
- Allows the host to return a pointer within the enclave memory
Mitigation and Prevention
Protect your systems from CVE-2020-8936 with these strategies.
Immediate Steps to Take
- Upgrade past commit 83036fd841d33baa7e039f842d131aa7881fdcc2
Long-Term Security Practices
- Regularly update and patch software
- Implement secure coding practices
- Conduct security audits and assessments
Patching and Updates
- Stay informed about security updates and patches