Horizon Alert
Summary of the vulnerability and why it matters
This vulnerability in HRConvert2 allows remote code execution by processing special characters in filenames. Because the input sanitization is incomplete, specially crafted filenames can lead to unauthorized commands being run on the server, potentially compromising the entire system.
- Remote code execution is possible.
- Affects self-hosted file conversion servers.
- Requires no prior access to exploit.
Attack Path
How an attacker could exploit the issue
An attacker could exploit this vulnerability by uploading a specially crafted filename to the HRConvert2 server. Since the server processes filenames directly through a shell command without proper sanitization, the attacker could embed malicious commands within the filename. These commands would then be executed by the server's operating system, leading to potential compromise of the server.
- No authentication required.
- Vulnerable file upload functionality.
- Malicious command in filename.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability allows unauthenticated attackers to execute arbitrary commands by crafting malicious filenames. Given that HRConvert2 is a self-hosted, drag-and-drop tool for file conversion and sharing, it's often exposed to the internet or wide networks to allow users to upload files. This exposure, combined with the ease of exploitation and critical impact, makes it an attractive target.
- Exploit code is readily available.
- Public exploits exist for this vulnerability.
- It is a critical command execution flaw.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
Prioritize investigating and isolating HRConvert2 instances, as unauthenticated remote code execution via crafted filenames is a critical risk. Given the widespread nature of self-hosted tools and the direct command execution, actively exploited status is a strong possibility.
- Update HRConvert2 to version 3.3.8.
- Block or restrict access to HRConvert2 endpoints.
- Monitor for unusual shell process activity.
