Cisco HyperFlex HX Data Platform File Upload Vulnerability

Successful exploitation of CVE-2021-1499 allows an attacker to upload files to the HyperFlex system without authentication. These files are uploaded with the permissions of the 'tomcat8' user, which could be leveraged to execute malicious code. This could lead to complete system compromise, data exfiltration, or denial of service. The attacker could potentially gain control of the entire HyperFlex cluster, impacting all virtual machines and data stored within it. The lack of authentication makes this vulnerability particularly concerning, as it requires minimal effort to exploit.

Organizations heavily reliant on Cisco HyperFlex HX Data Platform for their virtualized infrastructure are at significant risk. This includes businesses using HyperFlex for critical applications and data storage. Shared hosting environments utilizing HyperFlex are also particularly vulnerable, as a compromised instance could potentially impact other tenants.

• linux / server: Monitor HyperFlex system logs (e.g., /var/log/hyperflex/) for unusual file upload attempts. Use journalctl -f to monitor in real-time.

journalctl -f | grep 'file upload'

• generic web: Use curl to test the upload endpoint and verify that authentication is enforced.

curl -v -X POST -F '[email protected]' <hyperflex_upload_url>

• cisco: Check Cisco's security advisories and threat intelligence feeds for updates related to CVE-2021-1499.

1. 2021-05-06Disclosure

   disclosure

1. Reserviert2020-11-13
2. Veröffentlicht2021-05-06
3. Geändert2024-11-08
4. EPSS aktualisiert2026-04-02

The primary mitigation for CVE-2021-1499 is to upgrade to a patched version of Cisco HyperFlex HX Data Platform. Cisco has not yet released a fixed version as of the last update. Until a patch is available, implement temporary workarounds such as configuring a Web Application Firewall (WAF) to block unauthorized file uploads. Specifically, create WAF rules to filter requests targeting the upload endpoint and restrict file types. Regularly monitor system logs for suspicious activity related to file uploads. After upgrade, confirm by attempting a file upload with an unauthenticated user and verifying that the upload is rejected.