Siemens Privilege Escalation Hole

Tuesday, November 8, 2016 @ 03:11 PM gHale


Siemens released an advisory to inform its users how to mitigate a privilege escalation vulnerability that affects several of its industrial products, according to a report with ICS-CERT.

This vulnerability came directly to Siemens by WATERSURE and KIANDRA IT. As a result, Siemens produced updates for several products and a temporary fix for the remaining affected products to mitigate this vulnerability.

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The vulnerability affects the following products:
• SIMATIC WinCC:
V7.0 SP2 and earlier versions prior to V7.0 SP2 Upd 12
V7.0 SP3: All versions prior to V7.0 SP3 Upd 8
V7.2: All versions
V7.3: All versions
V7.4: All versions
• SIMATIC STEP 7 V5.X: All versions
• SIMATIC PCS 7:
V7.1 and earlier versions
V8.0: All versions
V8.1: All versions
V8.2: All versions
• SIMATIC WinCC Runtime Professional: All versions
• SIMATIC WinCC (TIA Portal) Professional: All versions
• SIMATIC WinCC (TIA Portal) Basic, Comfort, Advanced: All versions prior to V14
• SIMATIC STEP 7 (TIA Portal): All versions prior to V14
• SIMATIC NET PC-Software: All versions prior to V14
• SINEMA Remote Connect Client: All versions
• SINEMA Server: All versions prior to V13 SP2
• SIMATIC WinAC RTX 2010 SP2: All versions
• SIMATIC WinAC RTX F 2010 SP2: All versions
• SIMATIC IT Production Suite: All versions
• TeleControl Server Basic: All versions prior to V3.0 SP2
• SOFTNET Security Client V5.0: All versions
• SIMIT V9.0
• Security Configuration Tool (SCT): All versions
• Primary Setup Tool (PST): All versions

This vulnerability could allow local users to escalate their privileges if the affected products do not end up installed under the default path.

Siemens is a multinational company headquartered in Munich, Germany.

SIMATIC WinCC is a supervisory control and data acquisition (SCADA) system.

SIMATIC STEP 7 V5.X and STEP 7 (TIA Portal) are engineering software products for SIMATIC PLC products.

SIMATIC PCS 7 is a distributed control system (DCS) integrating SIMATIC WinCC.

SIMATIC WinCC Runtime Professional is a visualization runtime platform used for operator control and monitoring of machines and plants.

SIMATIC WinCC (TIA Portal) is an engineering software program to configure and program SIMATIC Panels, SIMATIC Industrial PCs, and Standard PCs running WinCC Runtime Advanced or SCADA System WinCC Runtime Professional visualization software.

SIMATIC NET PC-Software sees use for communication between controllers (PLCs) and PC based solutions (HMIs).

SINEMA Remote Connect Client ensures management of secure connections (VPN) between headquarters, service technicians and the installed machines or plants.

SINEMA Server is network management software for use in Industrial Ethernet networks.

SIMATIC WinAC RTX is the SIMATIC software controller for PC-based automation solutions.

SIMATIC IT Production Suite is a plant-centric IT solution building the link between Business Systems (e.g., ERP) and Control Systems.

TeleControl Server Basic allows remote monitoring and control of plants.

The SOFTNET Security Client allows programming devices such as PCs and notebook computers to access network nodes or automation systems protected by SCALANCE S.

The simulation software SIMIT allows the simulation of plant setups in order to anticipate faults in the early planning phase.

The Security Configuration Tool (SCT) is an engineering software for security devices such as SCALANCE-S or CP 443-1 Advanced.

The Primary Setup Tool (PST) allows initial network configuration of SIMATIC NET Industrial Ethernet products.

These products see action across several sectors including chemical, energy, food and agriculture, and water and wastewater systems. Siemens said these products see use on a global basis.

Unquoted service paths could allow local Microsoft Windows operating system users to escalate their privileges if the affected products do not end up installed under their default path (“C:\Program Files\*” or the localized equivalent).

CVE-2016-7165 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 6.4.

This vulnerability is not exploitable remotely and can only be exploited by a local valid operating system user.

No known public exploits specifically target this vulnerability. On top of that, crafting a working exploit for this vulnerability would be difficult.

If the affected products end up installed under their default path (“C:\Program Files\*” or the localized equivalent) and the default file system access permissions for drive C:\ were not modified, the security vulnerability is not exploitable.

However, if the affected products are not installed under their default path (“C:\Program Files\*” or the localized equivalent), the security vulnerability is potentially exploitable.

Siemens released updates for the following products and encourages user to apply the updates as soon as possible:
• SIMATIC WinCC:
V7.0 SP2: and earlier versions: Update to V7.0 SP2 Upd 12
V7.0 SP3: Update to V7.0 SP3 Upd 8
• SIMATIC WinCC (TIA Portal) Basic, Comfort, Advanced: Upgrade to V14
• SIMATIC STEP 7 (TIA Portal): Upgrade to V14
• SIMATIC NET PC-Software: Upgrade to V14
• TeleControl Server Basic: Update to V3.0 SP2
• SINEMA Server: Update to V13 SP2

For the following products in nondefault configurations, Siemens provides a temporary fix that resolves the security vulnerability:
• SIMATIC WinCC V7.2
• SIMATIC STEP 7 V5.X
• SIMATIC PCS 7 V7.1 and V8.0
• SIMATIC STEP 7 (TIA Portal) V13
• SIMATIC NET PC-Software V13
• SINEMA Remote Connect Client
• SIMATIC WinAC RTX 2010 SP2
• SIMATIC WinAC RTX F 2010 SP2
• SIMATIC IT Production Suite
• SOFTNET Security Client V5.0
• SIMIT V9.0
• Security Configuration Tool (SCT)
• Primary Setup Tool (PST)
The temporary fix can be found on Siemens web site.

For the following products in nondefault configurations, Siemens recommends customers apply the temporary fix, follow Siemens’ operational guidelines, and restrict file system access rights:
• SIMATIC WinCC V7.3 and V7.4
• SIMATIC PCS 7 V8.1 and V8.2
• SIMATIC WinCC Runtime Professional
• SIMATIC WinCC (TIA Portal) Professional

Siemens recommends users protect network access to engineering workstations and project storage with appropriate mechanisms. Siemens also advises users configure the operational environment according to Siemens’ Operational Guidelines for Industrial Security.

For more information on this vulnerability and more detailed mitigation instructions, see Siemens Security Advisory SSA-701708.

Siemens is working on new versions to incorporate the temporary fix for the remaining affected products and will update SSA-701708 when new information becomes available.



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