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How to Fix CVE-2024-39327: Critical CA Signing Vulnerability in Atos Eviden IDRA Software?

Arun KL

February 19, 2025

How to Fix CVE-2024-39327: Critical CA Signing Vulnerability in Atos Eviden IDRA Software?

Vulnerabilities

Red background image with text "How to Fix CVE-2024-39327" in white bold letters.

This article addresses a critical security vulnerability, CVE-2024-39327, affecting Atos Eviden IDRA software. This flaw could allow an attacker with low-privilege network access to illegitimately obtain Certificate Authority (CA) signing capabilities, potentially leading to severe security breaches. This article provides a comprehensive overview of the vulnerability, its impact, affected products, and, most importantly, remediation steps to help security professionals mitigate the risk effectively. The information presented here is geared towards security professionals in roles such as DevSecOps, application security, product security, vulnerability management, penetration testing, security operations, and security engineering.

A Short Introduction to Atos Eviden IDRA Software

Atos Eviden IDRA is a software solution designed to manage digital identities and access rights within an organization. It offers features such as user authentication, authorization, and certificate management. As a critical component of identity and access management (IAM) infrastructure, IDRA ensures that only authorized individuals and systems can access sensitive resources, playing a crucial role in maintaining the overall security posture of an organization.

Summary of CVE-2024-39327

CVE ID: CVE-2024-39327
Description: Incorrect Access Control vulnerability in Atos Eviden IDRA software that could allow unauthorized obtaining of CA (Certificate Authority) signing capabilities.
CVSS Score: 9.9
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

The core of this vulnerability lies in insufficient access control mechanisms within Atos Eviden IDRA. Specifically, the software fails to adequately protect access to Certificate Authority signing capabilities. An attacker with even low-level network access can exploit this flaw to gain unauthorized control over the CA, enabling them to generate fraudulent digital certificates. This is achievable due to the lack of proper validation and authorization checks when handling requests related to CA signing functions. Consequently, a malicious actor can bypass intended security protocols and assume the role of a trusted certificate issuer.

Impact of CVE-2024-39327

The exploitation of CVE-2024-39327 can have devastating consequences for organizations relying on Atos Eviden IDRA for certificate management. An attacker gaining CA signing capabilities can:

Generate fraudulent digital certificates: These certificates can be used to impersonate legitimate websites, applications, or services, leading to phishing attacks, man-in-the-middle attacks, and data breaches.
Compromise system integrity: By signing malicious code or software updates, the attacker can inject malware into systems, gaining control over critical infrastructure and applications.
Enable further sophisticated attacks: Control over the CA can be used as a stepping stone for more advanced persistent threats (APTs), allowing attackers to establish long-term access and control over an organization's network.
Gain unauthorized access to critical certificate management systems: The ability to sign certificates can grant access to sensitive areas within the certificate management system, potentially leading to further compromise of keys and other sensitive information.
Breach regulatory compliance: Trust on the digital certificates issued by an organisation will be lost, which could have financial ramifications.

In essence, successful exploitation of this vulnerability undermines the entire trust model upon which secure communications and transactions rely. Understanding the Indicator of Compromise is also important to identify ongoing exploitations.

Products Affected by CVE-2024-39327

The vulnerability affects the following product versions:

Product	Version(s) Affected
Atos Eviden IDRA	Before 2.6.1
Atos Eviden IDRA	2.6.1 and Later

It's crucial to note that Atos Eviden IDRA versions 2.6.1 and later contain the necessary fixes to address this vulnerability. Organizations using earlier versions are strongly advised to upgrade immediately. Also stay informed about PSIRT.

How to Check Your Product is Vulnerable?

Determining whether your Atos Eviden IDRA installation is vulnerable requires a few key steps:

1. Version Verification: The most straightforward method is to check the version of your IDRA software. Log in to the IDRA administration interface and navigate to the "About" section or system information panel. The version number displayed should be compared against the affected versions listed above (anything before 2.6.1).

2. Network Monitoring for Anomalous Activity: Closely monitor network traffic for any unusual activity related to certificate issuance or signing processes. This includes:

Unexpected requests to CA signing endpoints.
Unexplained spikes in certificate generation.
Requests originating from low-privilege network segments to CA servers.
Look for external IP addresses.

3. Audit Logging Review: Scrutinize audit logs for any unauthorized attempts to access CA signing functions. Specifically, look for failed authentication attempts followed by successful access to certificate signing operations. SIEM can help in this case.

4. Configuration Assessment: Review the configuration settings of your IDRA deployment, paying particular attention to access control lists (ACLs) and user permissions. Ensure that only authorized personnel have access to CA signing capabilities.

If any of these checks indicate a potential vulnerability, immediate action should be taken to mitigate the risk, as detailed in the next section. Consider vulnerability assessments strategy to identify the system risks.