Security Experts:

Connect with us

Hi, what are you looking for?



CredSSP Flaw Exposes Pepperl+Fuchs HMI Devices to Attacks

A vulnerability in the Credential Security Support Provider (CredSSP) authentication protocol has been found to impact several human-machine interface (HMI) products from Germany-based industrial automation firm Pepperl+Fuchs.

A vulnerability in the Credential Security Support Provider (CredSSP) authentication protocol has been found to impact several human-machine interface (HMI) products from Germany-based industrial automation firm Pepperl+Fuchs.

The flaw, tracked as CVE-2018-0886, affects all supported versions of Windows and it was fixed by Microsoft with its March 2018 Patch Tuesday updates.

The vulnerability was discovered by security firm Preempt, which has classified it as critical, but Microsoft, which believes exploitation is “less likely,” has assigned it only an “important” severity rating.

CredSSP processes authentication requests for applications such as the Remote Desktop Protocol (RDP) and Windows Remote Management (WinRM). A man-in-the-middle (MitM) attacker can exploit this vulnerability to remotely execute arbitrary code and move laterally within the targeted organization’s network.

Microsoft says any application using CredSSP for authentication could be vulnerable to this type of attack.

According to an advisory published by Germany’s [email protected], an organization that focuses on industrial cybersecurity, CVE-2018-0886 affects Pepperl+Fuchs’ VisuNet RM, VisuNet PC, and Box Thin Client BTC human-machine interface products.

“A successful vulnerability exploitation enables an attacker to execute arbitrary code and get access to sensitive data, e.g. passwords of the compromised system. The vulnerability allows the attacker to intercept the initial RDP connection between a client and a remote-server. Then an attacker can relay user credentials to a target system and thus get complete Man in the Middle control over a session. A stolen session can be abused to run arbitrary code or commands on the target server on behalf of the user,” [email protected] said in its advisory.

Register for SecurityWeek’s 2018 ICS Cyber Security Conference

Pepperl+Fuchs has advised owners of devices running RM Shell 4 and RM Shell 5 HMI software to install the security patches provided by the company. Users of devices running Windows 7 or Windows 10 can patch the vulnerability by updating Windows.

The advisory from [email protected] says Preempt reported the vulnerabilities to Pepperl+Fuchs, but the security firm told SecurityWeek that it did not explicitly reach out to any ICS vendor.

“CredSSP is a broadly used protocol and we worked with Microsoft, since it was in their software that we found these vulnerabilities,” said Ajit Sancheti, co-founder and CEO at Preempt. “It is quite likely that Pepperl+Fuchs uses the MSFT version and hence may have been informed by them.”

Products from other ICS vendors are likely also affected by the CredSSP vulnerability, but to date no other company has published security advisories.

Related: Pepperl+Fuchs HMIs Vulnerable to Meltdown, Spectre Attacks

Related: Pepperl+Fuchs Ecom Rugged Devices Exposed to KRACK Attacks

Written By

Eduard Kovacs (@EduardKovacs) is a contributing editor at SecurityWeek. He worked as a high school IT teacher for two years before starting a career in journalism as Softpedia’s security news reporter. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering.

Click to comment

Expert Insights

Related Content

CISO Strategy

Cybersecurity-related risk is a top concern, so boards need to know they have the proper oversight in place. Even as first-timers, successful CISOs make...

Mobile & Wireless

Technical details published for an Arm Mali GPU flaw leading to arbitrary kernel code execution and root on Pixel 6.

Mobile & Wireless

Apple rolled out iOS 16.3 and macOS Ventura 13.2 to cover serious security vulnerabilities.

Cloud Security

VMware vRealize Log Insight vulnerability allows an unauthenticated attacker to take full control of a target system.

Mobile & Wireless

Apple’s iOS 12.5.7 update patches CVE-2022-42856, an actively exploited vulnerability, in old iPhones and iPads.

Identity & Access

Hackers rarely hack in anymore. They log in using stolen, weak, default, or otherwise compromised credentials. That’s why it’s so critical to break the...


Security researchers have observed an uptick in attacks targeting CVE-2021-35394, an RCE vulnerability in Realtek Jungle SDK.

Mobile & Wireless

Two vulnerabilities in Samsung’s Galaxy Store that could be exploited to install applications or execute JavaScript code by launching a web page.