SB2012072401 - Insecure DLL loading in SIMATIC STEP 7 and PCS 7

Description

This security bulletin contains information about 1 vulnerability.

1) DDL hijacking (CVE-ID: CVE-2012-3015)

CWE-ID: CWE-426 - Untrusted Search Path

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red

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.

Remediation

Install update from vendor's website.

References

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