External risk intelligence

OpenShift Builder Command Injection and Privilege Escalation Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.1)

CVE-2024-7387

This vulnerability affects the OpenShift builder container during the build process. Build systems are typically internal developer tools restricted to authorized users within a private environment, and while they operate on a network, public internet exposure of the builder component itself is uncommon.

Path Traversal

Halo Surface Signal: 2 out of 5 — less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability in OpenShift's builder component could allow unauthorized command execution on nodes running build containers. This could lead to escalated privileges on the affected node, impacting the integrity of the host system. The main concern is confirming relevance and exposure within your OpenShift environments.

Attackers could run commands on build servers.
Critical flaw impacts OpenShift build containers.
Confirm if your OpenShift builds are affected.

Attack Path

How an attacker could exploit the issue

An attacker with privileged access within a container on an OpenShift node could exploit this vulnerability. By manipulating the build configuration with a specific attribute, an attacker could inject arbitrary commands through path traversal. This allows them to override executable files within the build container and potentially execute commands with elevated privileges on the host node.

Requires privileged container access.
Triggered by overriding executables in build configuration.
Risk of arbitrary command execution on node.

Live Threat

Current exploitation, exposure, and threat context

A flaw in the OpenShift builder could allow a malicious actor, with authenticated access, to execute arbitrary commands on the host node when the "Docker" build strategy is used. This is possible by overriding executable files within a privileged build container through specific build configuration attributes.

Arbitrary command execution on build nodes.
Exploited via specially crafted build configurations.
Potential for elevated permissions on host.

Operational Fix

Recommended remediation, mitigation, and detection steps

This critical vulnerability in the OpenShift builder component, allowing for command injection and privilege escalation on nodes, likely impacts platform and security teams responsible for the OpenShift cluster's integrity. The first practical step is to identify all OpenShift nodes running the builder, confirm if they are exposed to the internet or accessible by unauthorized users, and then determine the accountable platform owner to plan remediation.

Platform owners must address this.
Verify builder exposure and impact.
Plan targeted remediation actions.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is the OpenShift builder component?

The OpenShift builder is a specialized part of the OpenShift platform designed to automate the process of turning source code into container images. It handles build workflows, including those using the 'Docker' strategy, by running build processes within containers to ensure consistency across development and production environments.

What does CVE-2024-7387 mean?

This vulnerability is classified as CWE-250, which relates to execution with unnecessary privileges. In this case, a flaw in how the builder handles file paths allows a user to trick the system into overwriting essential executable files. This weakness enables command injection, where unauthorized commands are executed instead of the intended build steps.

How is this vulnerability triggered?

An attacker triggers this by manipulating the `spec.source.secrets.secret.destinationDir` attribute within a build configuration. This path traversal allows them to replace files inside a privileged build container. Notably, this flaw is not triggered by standard build operations that do not involve specifically crafting these malicious configuration attributes.

Is my environment at risk?

Halo Surface Signal notes that while build systems operate on a network, they are typically internal tools. Public internet exposure of the builder is uncommon. Your primary risk involves internal users who already have enough access to create or modify build configurations, as they could potentially escalate their privileges on the underlying host node.

How should I respond to this threat?

Start by identifying all nodes in your cluster currently running the builder component. Focus your assessment on who has permission to modify build configurations. Once identified, work with your platform owners to audit current configurations for the suspicious attribute and prioritize applying the necessary security updates provided by the vendor.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.