A local buffer overflow vulnerability in HNB Organizer version 1.9.18-10 allows unauthenticated local attackers to execute arbitrary code with the privileges of the application.

The application contains a stack-based buffer overflow in the handling of the -rc command-line argument. An attacker can supply an oversized input string exceeding 108 bytes to overwrite the stack and achieve arbitrary code execution.

Successful exploitation allows a local user to gain unauthorized code execution on the host system. While the attack requires local access, the CVSS score of 8.4 indicates a high severity due to the potential for full system compromise and the impact on confidentiality, integrity, and availability. This could lead to privilege escalation or unauthorized data access within the local environment.

Immediate Action: Since no official patch is currently available, users should restrict execution permissions for the hnb binary to only authorized users or remove the software from systems where it is not strictly required.

Proactive Monitoring: Review system execution logs and audit command-line arguments passed to applications for anomalous, excessively long strings that may indicate exploitation attempts.

Compensating Controls: Implement system-level security controls, such as Address Space Layout Randomization (ASLR) and Data Execution Prevention (DEP), to increase the difficulty of successful buffer overflow exploitation.

Public Exploit Available: Yes: A functional exploit script and technical details are available via Exploit-DB (EDB-ID 40025).

The presence of a functional exploit script makes this vulnerability a significant risk for any system where HNB Organizer is installed. Given the lack of a vendor-provided patch, organizations must prioritize restricting access to the application or removing it entirely to prevent local privilege escalation and unauthorized code execution.