CVE-2020-8939 : Exploit Details and Defense Strategies
Learn about CVE-2020-8939, an out of bounds read vulnerability in Asylo allowing memory manipulation. Discover the impact, affected systems, and mitigation steps.
An out of bounds read vulnerability in Asylo allows attackers to extend the result size used by memcpy() to read memory from within the enclave heap.
Understanding CVE-2020-8939
This CVE involves an out of bounds read vulnerability in Asylo, impacting versions up to 0.6.0.
What is CVE-2020-8939?
The vulnerability allows attackers to manipulate memory reads within the enclave heap, potentially leading to unauthorized access to sensitive data.
The Impact of CVE-2020-8939
- CVSS Base Score: 5.3 (Medium Severity)
- Attack Vector: Local
- Confidentiality Impact: High
- Integrity Impact: Low
- Privileges Required: Low
Technical Details of CVE-2020-8939
This section provides detailed technical information about the vulnerability.
Vulnerability Description
The vulnerability arises from an out of bounds read on the enc_untrusted_inet_ntop function, enabling attackers to read memory beyond the intended boundaries.
Affected Systems and Versions
- Affected Product: Asylo
- Vendor: Google LLC
- Affected Versions: <= 0.6.0
Exploitation Mechanism
Attackers can exploit this vulnerability by manipulating the result size used by memcpy() to access memory outside the enclave heap.
Mitigation and Prevention
Protect your systems from CVE-2020-8939 with the following steps:
Immediate Steps to Take
- Upgrade Asylo to a version beyond commit 6ff3b77ffe110a33a2f93848a6333f33616f02c4.
Long-Term Security Practices
- Regularly update and patch software to mitigate known vulnerabilities.
- Implement secure coding practices to prevent memory-related vulnerabilities.
Patching and Updates
- Apply patches and updates provided by the vendor to address the vulnerability.