ICS-CERT Publishes 2 Advisories and Siemens Update

Today the DHS ICS-CERT published two control system security advisories for products from Advantech and Delta Electronics. It also updated a previously published advisory for products from Siemens

Advantech Advisory

This advisory describes multiple vulnerabilities in the Advantech WebAccess products. The vulnerabilities were reported by Steven Seeley of Offensive Security, Zhou Yu and Andrea Micalizzi working with the Zero Day Initiative, and Michael Deplante. Advantech has released a new version that mitigates the vulnerabilities. There is no indication that any of the researchers were provided an opportunity to verify the efficacy of the fix.

The five reported vulnerabilities are:

• Untrusted pointer deference - CVE-2017-16728;

• Stack-based buffer overflow - CVE-2017-16724;

• Path traversal - CVE-2017-1672;

• SQL injection - CVE-2017-16716; and

• Improper input validation - CVE-2017-16753

ICS-CERT reports that a relatively low-skilled attacker could remotely exploit these vulnerabilities to cause the device to crash, remotely execute arbitrary code or bypass authentication.

Delta Advisory

This advisory describes multiple vulnerabilities in the Delta Industrial Automation Screen Editor. The vulnerabilities were reported by Steven Seeley of Source Incite. The affected product has been discontinued and Delta recommends upgrading to DOPSoft, Version 2. There is no indication that Seeley has verified the efficacy of the fix.

The three reported vulnerabilities are:

• Stack-based buffer overflow - CVE-2017-16751;

• Use after free - CVE-2017-16749; and

• Out-of-bounds write - CVE-2017-16747

ICS-CERT reports that a relatively low-skilled attacker with uncharacterized access could exploit the vulnerability to remotely execute arbitrary code.

Siemens Update

This update provides new information on an advisory that was was originally published on July 6^th, 2017, and updated on July 18^th, on July 28^th, on October 10^th, and then again on November 30^th. Siemens is providing updated version information and mitigation measures for their SIPROTEC 7UT686.

NOTE: This is the update that I mentioned last Saturday.