External risk intelligence

H3C CVM Arbitrary File Upload Leading to Remote Code Execution

CVE advisorySeverity: CRITICAL (CVSS 9.3)

CVE-2023-54405

The vulnerability affects a cloud virtualization management platform, which is typically deployed as a network-accessible service. The flaw resides in a specific endpoint (/cas/fileUpload/upload) designed for file uploads, allowing unauthenticated remote attackers to upload arbitrary files. Given its nature as a management interface, this service is inherently exposed and reachable.

Unrestricted File Upload

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

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This advisory concerns a critical vulnerability within H3C's Cloud Virtualization Management (CVM) software, a component of its CAS cloud platform. The flaw allows unauthenticated attackers to upload malicious files to the system, potentially enabling them to execute arbitrary code remotely. This could impact the integrity and availability of cloud infrastructure managed by this software.

Remote attackers can upload harmful files.
Affects critical cloud management software.
Confirm relevance and exposure to cloud services.

Attack Path

How an attacker could exploit the issue

An attacker can remotely upload arbitrary files to the H3C CVM, a cloud virtualization management component. This is possible by exploiting an unauthenticated file upload vulnerability in a specific endpoint. By manipulating a token parameter, an attacker can bypass path traversal and file type restrictions, allowing them to upload a malicious JSP file to a web-accessible directory. Once uploaded, the attacker can then request this file to achieve remote code execution as the web server user.

Unauthenticated remote access required.
Uploading a malicious file triggers vulnerability.
Remote code execution risk.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow remote attackers to upload arbitrary files to a web-accessible directory on the affected system. When supported by the advisory, this could enable the execution of malicious code as the web server user, potentially impacting system integrity and service availability.

System data could be compromised.
Uploading malicious files is possible.
Remote code execution may occur.

Operational Fix

Recommended remediation, mitigation, and detection steps

The H3C Cloud Virtualization Management (CVM) component is likely managed by a platform or infrastructure team responsible for cloud orchestration. The immediate first step is to inventory all instances of H3C CVM, determine their external reachability and business criticality, and identify the accountable system owner to plan for remediation.

Platform or Infrastructure Team ownership.
Verify CVM reachability and criticality.
Plan remediation based on risk.

Supplementary metadata

CVSS vector

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Frequently asked questions

What is the H3C CVM software?

H3C CVM stands for Cloud Virtualization Management. It serves as the administrative interface for the H3C CAS cloud platform, providing the tools and underlying architecture that IT teams use to orchestrate, deploy, and monitor virtualized cloud infrastructure and server resources.

What is the weakness behind CVE-2023-54405?

The vulnerability involves Unrestricted Upload of File with Dangerous Type, classified as CWE-434. In simple terms, the software fails to properly check what kind of files are being uploaded to its servers or where they are placed. This flaw allows an attacker to send a file to the system and bypass safety filters that should prevent unauthorized or dangerous code from being saved in web-accessible areas.

How can an attacker trigger this vulnerability?

An attacker exploits this by sending a request to a specific file upload endpoint and manipulating a parameter used for file processing. By bypassing path restrictions, they can direct the file to a location where the web server can execute it. Note that simply interacting with the H3C CAS platform does not trigger this; the bug requires specifically crafted requests that leverage the flawed upload token handling to place malicious files.

How do I know if my H3C CVM instance is at risk?

According to Halo Surface Signal, this vulnerability is considered very likely to affect your environment if your H3C CVM instance is reachable over a network. Because it acts as a management interface for cloud services, it is often exposed. You should check if your deployment is accessible from the internet or other untrusted networks, as these setups are the most critical targets.

What steps should I take if I run H3C CVM?

Start by performing an inventory to identify every instance of H3C CVM within your infrastructure. Once you have a list, verify which instances are exposed to the network and determine their business criticality. Engage the system owners immediately to understand the deployment context and prepare for official remediation steps to secure the management interface.

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.