CVE-2019-16863
Description
Cryptographic timing vulnerabilities were discovered in certain versions of the Trusted Platform Module (TPM) firmware distributed by Intel and STMicroelectronics. Software that uses the TPM to compute ECDSA signatures could leak information through the timing of ECDSA signature operations, allowing an attacker to recover parts of the private key.
Statement
This is a vulnerability in TPM firmware distributed by hardware vendors, not by Red Hat. Red Hat Enterprise Linux exposes the TPM device at /dev/tpm* where it is available for software with the correct privileges to use. Customers are advised to always ensure that firmware updates from hardware vendors are kept up to date with security fixes.
Mitigation
To remediate this vulnerability, install relevant firmware updates from your hardware vendor and follow their advice to regenerate keys that may be vulnerable or compromised. STMicroelectronics, Intel and OEMs have published firmware updates and advice at the links provided in the External References section.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.8 | 5.9 | N/A |
| Attack Vector | Network | Network | N/A |
| Attack Complexity | High | High | N/A |
| Privileges Required | None | None | N/A |
| User Interaction | None | None | N/A |
| Scope | Changed | Unchanged | N/A |
| Confidentiality | High | High | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | None | None | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
NVD: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Understanding the Weakness (CWE)
Confidentiality,Other
Technical Impact: Read Application Data; Other
Information exposure.
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