EVE: SSH as Root Unlockable Without Triggering Measured Boot
### Impact On boot, the Pillar container checks for /config/authorized_keys. If present with a valid public key, it enables SSH on port 22 with root login. The /config partition is not protected by measured boot, is mutable and unencrypted. This enables an attacker with physical access to the device to take out the disk, modify the /config partition using a separate server, then insert it, without the inserted key being flagged as an integrity voilation my measured boot and remote attestation. ### Patches Patched in 9.4.3-lts ### Workarounds None (apart from preventing physical access to the device)
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2023-43631US | high8.8 | — | ||
On boot, the Pillar eve container checks for the existence and content of
“/config/authorized_keys”.
If the file is present, and contains a supported public key, the container wi… | ||||
references
External citations — patches, advisories, analysis.
- https://asrg.io/security-advisories/cve-2023-43631WEB
- https://asrg.io/security-advisories/ssh-as-root-unlockable-without-triggering-measured-bootWEB
- https://github.com/lf-edge/evePACKAGE
- https://github.com/lf-edge/eve/commit/5fef4d92e75838cc78010edaed5247dfbdae1889WEB
- https://github.com/lf-edge/eve/commit/aa3501d6c57206ced222c33aea15a9169d629141WEB
- https://github.com/lf-edge/eve/security/advisories/GHSA-3mq9-xhgq-r7gjWEB
- https://nvd.nist.gov/vuln/detail/CVE-2023-43631ADVISORY
Advisories like this name the exposed products attackers go after on your perimeter. See what is exposed on your perimeter with a free passive scan.
Free scan