Insecure DLL loading in SIMATIC STEP 7 and PCS 7

Published: 2012-07-24 12:30:19
Severity Critical
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2012-3015
CVSSv3 9.2 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]
CWE ID CWE-426
Exploitation vector Network
Public exploit This vulnerability is being exploited in the wild.
Vulnerable software SIMATIC STEP 7
SIMATIC PCS 7
Vulnerable software versions SIMATIC STEP 7 5.5
SIMATIC PCS 7 7.1
SIMATIC PCS 7 7.1 SP1
SIMATIC PCS 7 7.1 SP2
SIMATIC PCS 7 7.1 SP3
Vendor URL Siemens

Security Advisory

1) DDL hijacking

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.

Remediation

Install updates from vendor's website.

External links

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

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