CVE-2023-43637 Vault Key Partially Predetermined
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2023-43637?
CVE-2023-43637 is a high-severity vulnerability in EVE OS, published on 21 Sep 2023.
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.
Which versions are affected by CVE-2023-43637?
3 open source packages ship an affected version, including github.com/lf-edge/eve. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/lf-edge/eve Go | All versions | 0.0.0-20220310190112-c0c966dc31e2 |
github.com/lf-edge/eve Go | All versions | 0.0.0-20220310190112-c0c966dc31e2 |
github.com/lf-edge/eve Go | All versions | 0.0.0-20220310190112-c0c966dc31e2 |
Products include Lfedge Eve.
How do I fix CVE-2023-43637?
Upgrade github.com/lf-edge/eve to 0.0.0-20220310190112-c0c966dc31e2 or later.
Is CVE-2023-43637 being exploited?
There is no known exploitation of CVE-2023-43637 in the wild and no public exploit code.
Other vulnerabilities in EVE OS
Sources
Also known as GHSA-g7vp-j25f-h34p, GO-2026-4436.