LF-Edge EVE OS up to 7.9 deriveVaultKey hard-coded key

CVSS Meta Temp Score
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CTI Interest Score
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7.4$0-$5k0.00

Summaryinfo

A vulnerability was found in LF-Edge EVE OS up to 7.9 and classified as critical. This affects the function deriveVaultKey. The manipulation results in hard-coded key. This vulnerability is reported as CVE-2023-43637. The attack requires a local approach. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in LF-Edge EVE OS up to 7.9. Affected is the function deriveVaultKey. The manipulation with an unknown input leads to a hard-coded key vulnerability. CWE is classifying the issue as CWE-321. The use of a hard-coded cryptographic key significantly increases the possibility that encrypted data may be recovered. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Due to the implementation of "deriveVaultKey", prior to version 7.10, the generated vault key would always have the last 16 bytes predetermined to be "arfoobarfoobarfo". This issue happens because "deriveVaultKey" calls "retrieveCloudKey" (which will always return "foobarfoobarfoobarfoobarfoobarfo" as the key), and then merges the 32byte randomly generated key with this key (by takeing 16bytes from each, see "mergeKeys"). This makes the key a lot weaker. This issue does not persist in devices that were initialized on/after version 7.10, but devices that were initialized before that and updated to a newer version still have this issue. Roll an update that enforces the full 32bytes key usage.

The weakness was disclosed 09/21/2023. The advisory is shared for download at asrg.io. This vulnerability is traded as CVE-2023-43637 since 09/20/2023. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1600.001.

Upgrading to version 7.10 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.4

VulDB Base Score: 7.0
VulDB Temp Score: 6.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CNA Base Score: 7.8
CNA Vector (Automotive Security Research Group (ASRG)): 🔍

CVSSv2info

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

Exploitinginfo

Class: Hard-coded key
CWE: CWE-321 / CWE-320
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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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: EVE OS 7.10

Timelineinfo

09/20/2023 🔍
09/21/2023 +1 days 🔍
09/21/2023 +0 days 🔍
10/14/2023 +23 days 🔍

Sourcesinfo

Advisory: asrg.io
Status: Confirmed

CVE: CVE-2023-43637 (🔍)
GCVE (CVE): GCVE-0-2023-43637
GCVE (VulDB): GCVE-100-240132

Entryinfo

Created: 09/21/2023 17:03
Updated: 10/14/2023 09:22
Changes: 09/21/2023 17:03 (49), 10/14/2023 09:22 (11)
Complete: 🔍
Cache ID: 216::103

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