CVE-2025-24513: Medium Vulnerability in ingress-nginx

A security issue was discovered in ingress-nginx where attacker-provided data are included in a filename by the ingress-nginx Admission Controller feature. This vulnerability allows for directory traversal within the container, which could lead to denial of service or, when combined with other vulnerabilities, limited disclosure of Secret objects from the cluster. The severity of this vulnerability is classified as medium, with a CVSS score of 4.8. Organizations should address this in their priority patch cycle.

The risk to organizations includes potential service disruption and exposure of sensitive data. Given the exploitability medium status, it is advised that defenders take action to mitigate the impact of this vulnerability. Immediate attention should be provided to environments where ingress-nginx is utilized to avoid possible exploitation.

Organizations should also be aware of the necessity of a comprehensive remediation strategy that includes not only patching but also ongoing monitoring and assessment to ensure that similar vulnerabilities do not persist. Evaluating the security posture in light of this vulnerability is essential.

The urgency for defenders is classified as medium, aligning with the severity and potential impact of this vulnerability. Organizations are encouraged to remain vigilant and proactive in their security measures.

Vulnerability Details

The official description of this vulnerability states that it allows attackers to include their data in filenames processed by the ingress-nginx Admission Controller, potentially leading to directory traversal. This vulnerability has a CVSS version 3.1 score of 4.8, indicating a medium severity level. The attack vector is classified as NETWORK, with high attack complexity and no privileges required. The confidentiality impact is low, while the availability impact is also low, and integrity is unaffected.

CWE classification for this vulnerability is CWE-20, which pertains to improper input validation. The issue was published on March 25, 2025, and the current status indicates it is awaiting analysis.

Technical Analysis

The root cause of this vulnerability lies in how the ingress-nginx Admission Controller processes filenames. Specifically, it fails to properly validate attacker-provided data, allowing for potential directory traversal within the containerized environment. The attack vector is through network interactions, with high complexity due to the requirement for specific conditions to be met for exploitation.

No user interaction is required for this vulnerability to be exploited, which can occur automatically under certain conditions. The impact on confidentiality is low, as it primarily allows for limited disclosure of sensitive objects. However, the availability impact is notable, as denial of service could lead to disruption of services relying on ingress-nginx.

Risk & Impact Analysis

Real-world deployment of ingress-nginx with this vulnerability poses risks including potential service disruptions and unauthorized access to sensitive information. The blast radius of this vulnerability could affect multiple applications relying on ingress-nginx, thus elevating the risk to organizations that utilize this component in their infrastructure.

Organizations should assess the urgency of remediation based on their specific implementations and dependencies on ingress-nginx. Given the CVSS score of 4.8, this vulnerability should be addressed in the next patch cycle. Continuous monitoring and assessment of the ingress-nginx configurations and usage will provide an additional layer of defense against exploitation.

Exploitation Status

Affected Versions

Specific affected versions are not listed; organizations should assume all versions prior to any forthcoming vendor patch are vulnerable.

Mitigation & Remediation

Organizations should monitor for any updates from the ingress-nginx maintainers regarding patches for this vulnerability. It is essential to apply patches as soon as they are available. In the absence of a patch, organizations should consider implementing workarounds such as validating and sanitizing input to the Admission Controller to mitigate the risk.

Furthermore, configuration hardening and network controls can help limit access to the ingress-nginx service. Continuous security testing can also aid in identifying areas of potential weakness before they can be exploited.

For further guidance on securing your applications, organizations may refer to resources on penetration testing and application security best practices.

Detection Guidance

Organizations should monitor logs for unusual access patterns and behaviors that could indicate an exploitation attempt. Indicators may include unauthorized access attempts to Secret objects or unusual file access patterns within the ingress-nginx service.

Behavioral anomalies related to the ingress-nginx controller should be investigated thoroughly. Network signatures that match known patterns of directory traversal attacks should also be flagged for review.

AppSecure Threat Intelligence Insight

This vulnerability highlights the ongoing risk associated with improper input validation in widely used components like ingress-nginx. Security teams need to maintain vigilance against directory traversal and similar vulnerabilities that can lead to significant exposure.

To enhance security posture, organizations should adopt a comprehensive vulnerability management program. Implementing practices such as regular security assessments and code reviews can help identify and address vulnerabilities before they can be exploited.

For additional resources, security teams should consider exploring vulnerability management best practices and the importance of penetration testing methodologies to ensure ongoing security.

In conclusion, as vulnerabilities like CVE-2025-24513 emerge, it is critical for organizations to stay informed and proactive, ensuring that their security measures are robust and up to date.