Vulnerability · Published Sep 21, 2023 · Assigned by ASRG
CVE-2023-43637Vault Key Partially Predetermined
High 7.8
In plain English
A high-severity security flaw in EVE OS from LF-Edge, Zededa. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/lf-edge/eve | 0.0.0-20220310190112-c0c966dc31e2 | GHSA-g7vp-j25f-h34p |
| Go | github.com/lf-edge/eve | 0.0.0-20220310190112-c0c966dc31e2 | GO-2026-4436 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| LF-Edge, Zededa | EVE OS | 0 – before 7.10 |
Weakness: CWE-321 · Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H