Privilege Escalation via Insecure File Permissions in BOSH

CVE-2026-47830 represents a critical privilege escalation vulnerability in the BOSH Windows stemcell builder, where incorrect permission assignments on sensitive executable files allow low-privileged authenticated users to overwrite critical system binaries. Specifically, the vulnerability resides in BOSH.Utils.psm1, which fails to properly restrict write access to C:\bosh\service_wrapper.exe and C:\bosh\bosh-agent.exe. When these files are replaced with malicious payloads, the attacker gains NT AUTHORITY\SYSTEM privileges upon the next service restart or system reboot. This impacts organizations using BOSH for infrastructure automation, particularly those deploying Windows-based virtual machines in cloud environments. The vulnerability is especially severe because it requires only low-privilege authenticated access, making it a natural stepping stone in multi-stage attacks targeting cloud infrastructure, containerized environments, or hybrid deployments where BOSH is used for stemcell generation.

While this CVE currently maps to zero MITRE ATT&CK techniques in standard taxonomies, Casky's extended reasoning capabilities would identify the underlying attack patterns as Privilege Escalation (T1548), File and Directory Permissions Modification (T1222.001), and Service Execution (T1569.002). A practitioner using Casky would observe detection findings highlighting insecure file permissions on system executables, unauthorized file write attempts to protected directories, and suspicious service restart patterns coinciding with binary modifications. Casky's Claude-powered analysis would correlate these indicators across your 754 mapped security skills, surfacing the precise permission assignment errors in PowerShell modules and recommending defensive controls such as file integrity monitoring, principle of least privilege enforcement on service accounts, and code review processes for infrastructure-as-code templates. The platform would help teams trace exploitation chains and implement compensating controls even where CVE details remain sparse or technique mappings incomplete.