CVE-2024-7387
Description
A flaw was found in openshift/builder. This vulnerability allows command injection via path traversal, where a malicious user can execute arbitrary commands on the OpenShift node running the builder container. When using the “Docker” strategy, executable files inside the privileged build container can be overridden using the spec.source.secrets.secret.destinationDir attribute of the BuildConfig definition. An attacker running code in a privileged container could escalate their permissions on the node running the container.
Statement
In all versions of OpenShift, the "Custom" build strategy gives developers permission to run arbitrary commands in a privileged container. This is disabled by default, and documentation explicitly warns that this should only be enabled for highly trusted users (eg: cluster admins). We therefore do not consider this vulnerability a privilege escalation path for "Custom" strategy builds.
Microshift is not affected by this vulnerability. MicroShift does not include this OpenShift API.
The Builds for Red Hat OpenShift Operator based on Shipwright is not affected by this vulnerability.
Mitigation
Cluster admins can follow the instructions in "Securing Builds by Strategy" to block use of the "Docker" build strategy on a cluster, or restrict the use to a set of highly trusted users, until the cluster is able to be upgraded.
https://docs.openshift.com/container-platform/4.16/cicd/builds/securing-builds-by-strategy.html
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 9.1 | N/A | N/A |
| Attack Vector | Network | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | High | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Changed | N/A | N/A |
| Confidentiality | High | N/A | N/A |
| Integrity Impact | High | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Understanding the Weakness (CWE)
Confidentiality,Integrity,Availability,Access Control
Technical Impact: Gain Privileges or Assume Identity; Execute Unauthorized Code or Commands; Read Application Data; DoS: Crash, Exit, or Restart
An attacker will be able to gain access to any resources that are allowed by the extra privileges. Common results include executing code, disabling services, and reading restricted data. New weaknesses can be exposed because running with extra privileges, such as root or Administrator, can disable the normal security checks being performed by the operating system or surrounding environment. Other pre-existing weaknesses can turn into security vulnerabilities if they occur while operating at raised privileges.
Acknowledgements
Red Hat would like to thank Armin Stock for reporting this issue.
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