Information disclosure in Siemens Industrial Products

1) Improper input validation

EUVDB-ID: #VU9594

Risk: Medium

CVSSv3.1: 6.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-3737

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information on the target system.

The weakness exists due to an "error state mechanism" when SSL_read() or SSL_write() is called directly after SSL object. A remote attacker can a specially crafted input, trigger a fatal error during a handshake and return it in the initial function call to access or modify sensitive information.

Mitigation

Install update from vendor's website.

Vulnerable software versions

SIMATIC S7-1200: All versions

SINUMERIK Integrate Operate Client: All versions

SINUMERIK Integrate Access MyMachine service engineer client: All versions

SIMATIC WinCC OA: All versions

SIMATIC WinCC (TIA Portal): All versions

SIMATIC STEP 7 (TIA Portal): All versions

SIMATIC IPC DiagMonitor: All versions

SIMATIC IPC DiagBase: All versions

SIMATIC HMI WinCC Flexible: All versions

SIMATIC ET 200SP Open Controller: All versions

MindConnect Nano (IPC227D): All versions

MindConnect IoT2040: All versions

: All versions

External links

http://support.industry.siemens.com/cs/document/109478459/firmware-update-s7-1500-cpus-incl-displays-and-et200-cpus?dti=0&lc=en-WW

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.