Intel Xeon SGX default permission

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.7$0-$5k0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in Intel Xeon. This affects an unknown part of the component SGX. The manipulation results in default permission. This vulnerability was named CVE-2024-21820. The attack needs to be approached locally. There is no available exploit.

Detailsinfo

A vulnerability classified as critical has been found in Intel Xeon (affected version unknown). Affected is an unknown functionality of the component SGX. The manipulation with an unknown input leads to a default permission vulnerability. CWE is classifying the issue as CWE-276. During installation, installed file permissions are set to allow anyone to modify those files. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Incorrect default permissions in some Intel(R) Xeon(R) processor memory controller configurations when using Intel(R) SGX may allow a privileged user to potentially enable escalation of privilege via local access.

The advisory is available at intel.com. This vulnerability is traded as CVE-2024-21820 since 01/24/2024. The exploitability is told to be easy. Local access is required to approach this attack. Additional levels of successful authentication are necessary for exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 11/16/2024). This vulnerability is assigned to T1222 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 211478 (Fedora 41 : microcode_ctl (2024-28ea86c8aa)), 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 vulnerability database at Tenable (211478). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔍
CNA CVSS-BT Score: 🔍
CNA Vector: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.7

VulDB Base Score: 4.2
VulDB Temp Score: 4.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 7.2
CNA Vector (intel): 🔍

CVSSv2info

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

Exploitinginfo

Class: Default permission
CWE: CWE-276 / CWE-266
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: 211478
Nessus Name: Fedora 41 : microcode_ctl (2024-28ea86c8aa)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

01/24/2024 🔍
11/13/2024 +294 days 🔍
11/13/2024 +0 days 🔍
11/16/2024 +3 days 🔍

Sourcesinfo

Vendor: intel.com

Advisory: intel-sa-01079
Status: Confirmed

CVE: CVE-2024-21820 (🔍)
GCVE (CVE): GCVE-0-2024-21820
GCVE (VulDB): GCVE-100-284418

Entryinfo

Created: 11/13/2024 22:32
Updated: 11/16/2024 09:47
Changes: 11/13/2024 22:32 (75), 11/16/2024 09:47 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion

 Anonymous User (+0)
2 years ago
The vulnerability affecting Intel(R) Xeon(R) processors when using Intel(R) SGX can also be related to Intel microcode.
Issues in the memory controller configurations of Intel Xeon processors may also involve microcode updates to address these vulnerabilities.
Given this, I kindly request that the CPE intel:microcode be considered in relation to this vulnerability.
 VulDB Community Team2 years ago
Intel mentions a Microcode update if Microcode is affected which is not the case here and therefore intel:microcode too generic. We wait if NVD assigns this CPE and might merge their results as well.

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