CVE-2023-43633

/// Technical description

On boot, the Pillar eve container checks for the existence and content of

“/config/GlobalConfig/global.json”.

If the file exists, it overrides the existing configuration on the device on boot.

This allows an attacker to change the system’s configuration, which also includes some

debug functions.

This could be used to unlock the ssh with custom “authorized_keys” via the

“debug.enable.ssh” key, similar to the “authorized_keys” finding that was noted before.

Other usages include unlocking the usb to enable the keyboard via the “debug.enable.usb”

key, allowing VNC access via the “app.allow.vnc” key, and more.

An attacker could easily enable these debug functionalities without triggering the “measured

boot” mechanism implemented by EVE OS, and without marking the device as “UUD”

(“Unknown Update Detected”).

This is because the “/config” partition is not protected by “measured boot”, it is mutable and it

is not encrypted in any way.

An attacker can gain full control over the devic

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References