CVE-2023-43637: lf-edge, zededa eve os Use of Hard-coded Cryptographic Key

Vulnerability summary

CVE-2023-43637 is a high (CVSS 7.8) Use of Hard-coded Cryptographic Key vulnerability in lf-edge, zededa eve os. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 3.1% of scored vulnerabilities.

Timeline

1. 21-09-2023
   PublishedVulnerability first disclosed.
2. 24-09-2024
   Last modifiedVulnerability information updated.

Description

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.

• CWE-321Use of Hard-coded Cryptographic KeyThe product uses a hard-coded, unchangeable cryptographic key.
• CWE-798Use of Hard-coded CredentialsThe product contains hard-coded credentials, such as a password or cryptographic key.