CVE-2020-8938 : Security Advisory and Response
Learn about CVE-2020-8938, an arbitrary memory overwrite vulnerability in Asylo versions up to 0.6.0 allowing attackers to write memory values within the enclave. Find mitigation steps and impact details here.
An arbitrary memory overwrite vulnerability in Asylo versions up to 0.6.0 allows an attacker to write memory values from within the enclave.
Understanding CVE-2020-8938
This CVE involves an arbitrary enclave memory location write vulnerability in Asylo versions up to 0.6.0.
What is CVE-2020-8938?
The vulnerability allows an attacker to make a host call with controlled content, enabling writing memory values within the enclave.
The Impact of CVE-2020-8938
- CVSS Base Score: 5.3 (Medium)
- Attack Vector: Local
- Confidentiality Impact: High
- Integrity Impact: Low
- Privileges Required: Low
- Scope: Unchanged
- User Interaction: None
- Attack Complexity: High
- Availability Impact: None
Technical Details of CVE-2020-8938
This section provides detailed technical information about the vulnerability.
Vulnerability Description
The vulnerability in Asylo versions up to 0.6.0 allows an attacker to perform an arbitrary memory overwrite within the enclave.
Affected Systems and Versions
- Affected Product: Asylo
- Vendor: Google LLC
- Affected Versions: Up to 0.6.0
Exploitation Mechanism
The attacker can exploit this vulnerability by manipulating the content and size of klinux_addr during a host call to FromkLinuxSockAddr.
Mitigation and Prevention
To address CVE-2020-8938, follow these mitigation steps:
Immediate Steps to Take
- Upgrade to a version past commit a37fb6a0e7daf30134dbbf357c9a518a1026aa02
Long-Term Security Practices
- Regularly update Asylo to the latest version
- Implement secure coding practices
Patching and Updates
- Apply patches and updates provided by the vendor