Executive brief
Siemens SINEC INS, a tool used to manage network services in industrial environments, contains a security flaw that could allow an attacker to take full control of the system. By exploiting a misconfigured internal component, a user with low-level access can bypass security restrictions to modify any file on the system. This can lead to a complete takeover of the application and the underlying server, potentially disrupting industrial network operations.
Technical details
A vulnerability exists in Siemens SINEC INS where a system binary is incorrectly configured with the 'cap_dac_override' Linux capability. This capability allows a process to bypass all Discretionary Access Control (DAC) file permission checks (read, write, and execute). An authenticated attacker with low privileges can leverage this misconfiguration to perform arbitrary file modifications on the underlying filesystem. This path leads to a full privilege escalation to root. While the CVSS vector indicates a network attack vector (AV:N), the vulnerability is fundamentally an 'Execution with Unnecessary Privileges' (CWE-250) issue. Siemens recommends updating to V1.0 SP2 Update 6 or later to remediate this flaw.
Affected products
- Siemens SINEC INS All versions < V1.0 SP2 Update 6
Timeline
- 2026-06-09: advisory: Siemens published SSA-860189
- 2026-06-09: disclosed: CVE-2026-46748 published in NVD