CVE-2020-26933 : Security Advisory and Response

Trusted Computing Group (TCG) Trusted Platform Module Library Family 2.0 Library Specification Revisions 1.38 through 1.59 has Incorrect Access Control during a non-orderly TPM shut-down that uses USE_DA_USED. Improper initialization of this shut-down may result in susceptibility to a dictionary attack.

Understanding CVE-2020-26933

This CVE involves a vulnerability in the Trusted Computing Group (TCG) Trusted Platform Module Library Family 2.0 Library Specification.

What is CVE-2020-26933?

The vulnerability in the TCG Trusted Platform Module Library Family 2.0 Library Specification allows for Incorrect Access Control during a non-orderly TPM shut-down, potentially leading to a dictionary attack due to improper initialization.

The Impact of CVE-2020-26933

The impact of this vulnerability is rated as HIGH severity according to the CVSS v3.1 metrics. It affects confidentiality, integrity, and requires high privileges for exploitation.

Technical Details of CVE-2020-26933

This section provides more technical insights into the CVE.

Vulnerability Description

The vulnerability arises from Incorrect Access Control during a non-orderly TPM shut-down using USE_DA_USED, leading to susceptibility to a dictionary attack.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions: 1.38 through 1.59 are affected

Exploitation Mechanism

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

Mitigation and Prevention

Protecting systems from CVE-2020-26933 is crucial to maintaining security.

Immediate Steps to Take

Monitor for security advisories from Trusted Computing Group
Implement proper shutdown procedures for TPM
Apply security patches promptly

Long-Term Security Practices

Regularly update and patch TPM software
Conduct security assessments to identify vulnerabilities
Train staff on secure TPM usage

Patching and Updates

Stay informed about patches and updates from Trusted Computing Group
Apply patches as soon as they are released to mitigate the vulnerability