Horizon Alert
Summary of the vulnerability and why it matters
This vulnerability involves an arbitrary file upload flaw in Redsea Cloud eHR, allowing unauthenticated attackers to execute malicious code remotely. The issue stems from a failure to validate uploaded file types, enabling attackers to disguise code as an image and gain server access through a specific endpoint.
- Unauthenticated code execution via file upload.
- Potentially impacts sensitive HR data and systems.
- Confirm exposure and assess relevant systems.
Attack Path
How an attacker could exploit the issue
An attacker can gain initial access to the system by targeting the `PtFjk.mob` servlet, which is exposed on the internet. By sending a specially crafted request that bypasses file type checks, an attacker can upload a malicious JavaServer Pages (JSP) file. This file, once executed by the web server due to its predictable location, allows the attacker to achieve remote code execution.
- No authentication or privileges required.
- Upload a malicious file to a specific endpoint.
- Achieve remote code execution.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability could allow an unauthenticated attacker to execute arbitrary code on the affected system by uploading a malicious file. This is possible by exploiting a file upload flaw in the PtFjk.mob servlet.
- System code execution.
- Malicious file upload via a predictable path.
- Remote code execution on the server.
Operational Fix
Recommended remediation, mitigation, and detection steps
Redsea Cloud eHR's arbitrary file upload vulnerability requires immediate attention from teams managing cloud-based HR systems. Initial steps should focus on identifying all instances of this technology within the environment, assessing their exposure and criticality, and locating the accountable application or infrastructure owner before planning remediation.
- Identify accountable system owners.
- Verify internet reachability and criticality.
- Plan risk-based remediation efforts.
