The fwctl driver implements a state machine which is executed when a bhyve guest accesses certain x86 I/O ports. The interface lets the guest copy a string into a buffer resident in the bhyve process' memory. A bug in the state machine implementation can result in a buffer overflowing when copying this string. Malicious, privileged software running in a guest VM can exploit the buffer overflow to achieve code execution on the host in the bhyve userspace process, which typically runs as root, mitigated by the capabilities assigned through the Capsicum sandbox available to the bhyve process.
This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 8.8, requiring local system access to exploit with relatively low complexity without requiring user interaction requiring only low-level privileges . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), and availability (service disruption) for affected systems. Impacting 1 product from freebsd organizations running these solutions should prioritize assessment and patching.
Reported in 2023, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.
2023-08-01T23:15:31.053
2025-02-13T17:16:57.040
Modified
CVSSv3.1: 8.8 (HIGH)
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Operating System | freebsd | freebsd | 13.1 | Yes |
| Operating System | freebsd | freebsd | 13.1 | Yes |
| Operating System | freebsd | freebsd | 13.1 | Yes |
| Operating System | freebsd | freebsd | 13.1 | Yes |
| Operating System | freebsd | freebsd | 13.1 | Yes |
| Operating System | freebsd | freebsd | 13.1 | Yes |
| Operating System | freebsd | freebsd | 13.1 | Yes |
| Operating System | freebsd | freebsd | 13.1 | Yes |
| Operating System | freebsd | freebsd | 13.1 | Yes |
| Operating System | freebsd | freebsd | 13.1 | Yes |
| Operating System | freebsd | freebsd | 13.1 | Yes |
| Operating System | freebsd | freebsd | 13.1 | Yes |
| Operating System | freebsd | freebsd | 13.2 | Yes |
| Operating System | freebsd | freebsd | 13.2 | Yes |
SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For freebsd's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.