CVE-2023-43631 Vulnerability Details

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CVE-2023-43631 Metadata Quick Info

CVE Published: 21/09/2023 | CVE Updated: 24/09/2024 | CVE Year: 2023
Source: ASRG | Vendor: LF-Edge, Zededa | Product: EVE OS
Status : PUBLISHED

CVE-2023-43631 Description

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 will go on to open port 22 and enable sshd with the given keys as the authorized keys for root login. An attacker could easily add their own keys and gain full control over the system 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 device without changing the PCR values, thus not triggering the “measured boot” mechanism, and having full access to the vault. Note: This issue was partially fixed in these commits (after disclosure to Zededa), where the config partition measurement was added to PCR13: • aa3501d6c57206ced222c33aea15a9169d629141 • 5fef4d92e75838cc78010edaed5247dfbdae1889. This issue was made viable in version 9.0.0 when the calculation was moved to PCR14 but it was not included in the measured boot.

Metrics

CVSS Version: 3.1 | Base Score: 8.8 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

l➤ Exploitability Metrics:
    Attack Vector (AV)* LOCAL
    Attack Complexity (AC)* LOW
    Privileges Required (PR)* LOW
    User Interaction (UI)* NONE
    Scope (S)* CHANGED

l➤ Impact Metrics:
    Confidentiality Impact (C)* HIGH
    Integrity Impact (I)* HIGH
    Availability Impact (A)* HIGH

Weakness Enumeration (CWE)

CWE-ID: CWE-522
CWE Name: CWE-522 Insufficiently Protected Credentials
Source: LF-Edge, Zededa

Common Attack Pattern Enumeration and Classification (CAPEC)

CAPEC-ID: CAPEC-115
CAPEC Description: CAPEC-115 Authentication Bypass