CVE-2018-16994 : Exploit Details and Defense Strategies

A vulnerability has been identified in devices such as PHOENIX CONTACT AXL F BK PN <=1.0.4, AXL F BK ETH <= 1.12, and AXL F BK ETH XC <= 1.11, as well as Bosch Rexroth S20-ETH-BK and Rexroth S20-PN-BK+ (the S20-PN-BK+/S20-ETH-BK fieldbus couplers sold by Bosch Rexroth incorporate Phoenix Contact technology). The issue stems from mishandling requests containing non-standard symbols, which could be exploited by remote attackers to cause a complete bus coupler lock up. Notably, authentication for the request is not required.

Understanding CVE-2018-16994

This CVE identifies a vulnerability in specific devices that could lead to a complete bus coupler lock up when exploited by remote attackers.

What is CVE-2018-16994?

CVE-2018-16994 is a security vulnerability found in PHOENIX CONTACT and Bosch Rexroth devices due to mishandling requests with non-standard symbols, allowing remote attackers to cause a complete bus coupler lock up.

The Impact of CVE-2018-16994

The vulnerability could result in a denial of service (DoS) condition, disrupting the normal operation of affected devices and potentially causing system downtime.

Technical Details of CVE-2018-16994

This section provides more in-depth technical information about the vulnerability.

Vulnerability Description

The vulnerability arises from the incorrect handling of requests containing non-standard symbols, enabling remote attackers to trigger a complete lock up of the bus coupler without requiring authentication.

Affected Systems and Versions

PHOENIX CONTACT AXL F BK PN <=1.0.4
PHOENIX CONTACT AXL F BK ETH <= 1.12
PHOENIX CONTACT AXL F BK ETH XC <= 1.11
Bosch Rexroth S20-ETH-BK
Bosch Rexroth S20-PN-BK+

Exploitation Mechanism

Remote attackers can exploit this vulnerability by sending requests with non-standard symbols to the affected devices, causing a complete bus coupler lock up.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent the exploitation of this vulnerability.

Immediate Steps to Take

Apply security patches provided by the respective vendors promptly.
Implement network segmentation to limit the impact of potential attacks.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update and patch all devices and software in the network.
Conduct security assessments and penetration testing to identify and address vulnerabilities proactively.
Educate users and administrators about cybersecurity best practices.

Patching and Updates

Stay informed about security advisories from PHOENIX CONTACT and Bosch Rexroth.
Apply recommended patches and updates to mitigate the vulnerability effectively.