8.8
HIGH
CVE-2023-43631
Pillar Unauthorized SSH Key Insertion Arbitrary Code Execution
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.

INFO

Published Date :

Sept. 21, 2023, 2:15 p.m.

Last Modified :

Sept. 28, 2023, 6:15 a.m.

Source :

[email protected]

Remotely Exploitable :

No

Impact Score :

6.0

Exploitability Score :

2.0
Affected Products

The following products are affected by CVE-2023-43631 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linuxfoundation edge_virtualization_engine
1 Lfedge eve
: Total Affected Vendor : 2 | Products : 2
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2023-43631.

URL Resource
https://asrg.io/security-advisories/cve-2023-43631/

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2023-43631 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2023-43631 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Sep. 28, 2023

    Action Type Old Value New Value
    Removed Reference https://asrg.io/security-advisories/ssh-as-root-unlockable-without-triggering-measured-boot/ [Third Party Advisory]
    Added Reference https://asrg.io/security-advisories/cve-2023-43631/ [No Types Assigned]
  • Initial Analysis by [email protected]

    Sep. 25, 2023

    Action Type Old Value New Value
    Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
    Changed Reference Type https://asrg.io/security-advisories/ssh-as-root-unlockable-without-triggering-measured-boot/ No Types Assigned https://asrg.io/security-advisories/ssh-as-root-unlockable-without-triggering-measured-boot/ Third Party Advisory
    Added CWE NIST CWE-522
    Added CPE Configuration OR *cpe:2.3:o:linuxfoundation:edge_virtualization_engine:*:*:*:*:*:*:*:* versions up to (excluding) 8.6.0 *cpe:2.3:o:linuxfoundation:edge_virtualization_engine:*:*:*:*:*:*:*:* versions from (including) 9.0.0 up to (excluding) 9.5.0
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2023-43631 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2023-43631 weaknesses.

CAPEC-50: Password Recovery Exploitation Password Recovery Exploitation CAPEC-102: Session Sidejacking Session Sidejacking CAPEC-474: Signature Spoofing by Key Theft Signature Spoofing by Key Theft CAPEC-509: Kerberoasting Kerberoasting CAPEC-551: Modify Existing Service Modify Existing Service CAPEC-555: Remote Services with Stolen Credentials Remote Services with Stolen Credentials CAPEC-560: Use of Known Domain Credentials Use of Known Domain Credentials CAPEC-561: Windows Admin Shares with Stolen Credentials Windows Admin Shares with Stolen Credentials CAPEC-600: Credential Stuffing Credential Stuffing CAPEC-644: Use of Captured Hashes (Pass The Hash) Use of Captured Hashes (Pass The Hash) CAPEC-645: Use of Captured Tickets (Pass The Ticket) Use of Captured Tickets (Pass The Ticket) CAPEC-652: Use of Known Kerberos Credentials Use of Known Kerberos Credentials CAPEC-653: Use of Known Operating System Credentials Use of Known Operating System Credentials
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.04 }} 0.00%

score

0.07202

percentile

CVSS31 - Vulnerability Scoring System
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