CVE-2023-43637: high-severity vulnerability in LF-Edge, Zededa EVE OS
Vault Key Partially Predetermined
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.8epss 0.1%
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.
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Affected products
LF-Edge, Zededa · EVE OSRelated CVEs — LF-Edge, Zededa EVE OS
In the same product, most dangerous first.
CVE-2023-43632CRITICALFreely Allocate Buffer on The Stack With Data From SocketEPSS 0.7%CVE-2023-43634HIGH Config Partition Not Protected by Measured BootEPSS 0.2%CVE-2023-43631HIGHSSH as Root Unlockable Without Triggering Measured BootEPSS 0.2%CVE-2023-43633HIGHDebug Functions Unlockable Without Triggering Measured BootEPSS 0.2%CVE-2023-43636HIGHRootfs Not ProtectedEPSS 0.1%CVE-2023-43635HIGHVault Key Sealed With SHA1 PCRsEPSS 0.1%