Horizon Alert
Summary of the vulnerability and why it matters
This advisory concerns a critical vulnerability in the goshs SimpleHTTPServer, a Go-based file serving tool. The flaw allows unauthenticated attackers to bypass access controls, upload files, create directories, and even delete protected files or authorization configurations within specific directories. This could potentially lead to unauthorized access and modification of sensitive information.
- Attackers bypass folder security.
- Critical authorization bypass impacts all data.
- Confirm relevance and assess exposure.
Attack Path
How an attacker could exploit the issue
An unauthenticated attacker can access a goshs server on the network and manipulate files within directories that are supposed to be protected by access controls. By uploading, creating, or deleting files, including the access control configuration itself, the attacker can bypass authentication and gain unauthorized access to sensitive information and system functions. This bypass can lead to a complete compromise of the server's confidentiality, integrity, and availability.
- No authentication required for access.
- Attacker deletes folder authentication files.
- Risk to confidentiality, integrity, availability.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability allows an unauthenticated attacker to bypass access controls when supported. When the .goshs ACL/basic-auth mechanism is in place, an attacker could potentially upload, modify, or delete files and directories within protected folders, and even remove the protection entirely by deleting the .goshs file. This could lead to unauthorized access to sensitive information, modification of data, or disruption of service.
- Protected files and directories.
- Bypassing .goshs ACLs and deleting auth policy.
- Unauthorized data access and modification.
Operational Fix
Recommended remediation, mitigation, and detection steps
Application owners or platform teams are likely responsible for managing this Go-based SimpleHTTPServer. The initial step involves locating all instances of the affected technology, determining their reachability and criticality, identifying the accountable owner, and then prioritizing remediation based on the assessed risk.
- Identify accountable application/platform owners.
- Verify reachability and business criticality.
- Plan remediation or implement temporary controls.
