AMD EPYC CPU ROM Microcode Patch Loader signature verification

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.4$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in AMD EPYC. This affects an unknown part of the component CPU ROM Microcode Patch Loader. This manipulation causes signature verification. The identification of this vulnerability is CVE-2024-36347. The attack can only be executed locally. There is no exploit available.

Detailsinfo

A vulnerability classified as critical was found in AMD EPYC (the affected version is unknown). Affected by this vulnerability is an unknown code of the component CPU ROM Microcode Patch Loader. The manipulation with an unknown input leads to a signature verification vulnerability. The CWE definition for the vulnerability is CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Improper signature verification in AMD CPU ROM microcode patch loader may allow an attacker with local administrator privilege to load malicious microcode, potentially resulting in loss of integrity of x86 instruction execution, loss of confidentiality and integrity of data in x86 CPU privileged context and compromise of SMM execution environment.

The advisory is shared at bugzilla.redhat.com. This vulnerability is known as CVE-2024-36347 since 05/23/2024. The exploitation appears to be difficult. An attack has to be approached locally. Additional levels of successful authentication are needed for exploitation. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 232192 (Linux Distros Unpatched Vulnerability : CVE-2024-36347), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (232192) and EUVD (EUVD-2024-54719). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.4

VulDB Base Score: 6.4
VulDB Temp Score: 6.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 6.4
CNA Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Signature verification
CWE: CWE-347 / CWE-345
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 232192
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2024-36347

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

05/23/2024 🔍
03/05/2025 +286 days 🔍
03/05/2025 +0 days 🔍
07/01/2025 +118 days 🔍

Sourcesinfo

Advisory: bugzilla.redhat.com
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2024-36347 (🔍)
GCVE (CVE): GCVE-0-2024-36347
GCVE (VulDB): GCVE-100-298729
EUVD: 🔍

Entryinfo

Created: 03/05/2025 21:17
Updated: 07/01/2025 08:32
Changes: 03/05/2025 21:17 (50), 03/06/2025 18:42 (2), 06/28/2025 09:30 (10), 07/01/2025 08:32 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion

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