Vulnerability identifier: #VU6192

Vulnerability risk: Critical

CVSSv3.1: 9.2 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2012-3015

CWE-ID: CWE-426

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SIMATIC STEP 7
Server applications / SCADA systems
SIMATIC PCS 7
Server applications / SCADA systems

Vendor: Siemens

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to insecure DDL loading mechanism when processing STEP 7 files in SIMATIC STEP 7 and SIMATIC PCS 7 software. A remote attacker can trick the victim into opening a SETP 7 file from a remote SMB or WebDAV share, which hosts malicious .dll file, and execute arbitrary code on the target system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Note: the vulnerability has been exploited in the wild by Stuxnet malware in 2010.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

SIMATIC STEP 7: 5.5

SIMATIC PCS 7: 7.1 - 7.1 SP3

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External links
http://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-110665.pdf
http://ics-cert.us-cert.gov/advisories/ICSA-12-205-02

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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?

Yes. This vulnerability is being exploited in the wild.