SB2020040611 - Multiple vulnerabilities in B&R Automation Studio

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2019-19100)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to improper permission checks in the upgrade service. A local user can delete arbitrary files via an exposed interface.

This vulnerability affects the following versions:

2) Missing Required Cryptographic Step (CVE-ID: CVE-2019-19101)

The vulnerability allows a remote attacker to perform a man-in-the-middle (MitM) attack.

The vulnerability exists due to the missing secure communication definition and an incomplete TLS validation in the upgrade service. A remote attacker can perform MitM attacks via the B&R upgrade server. 

This vulnerability affects the following versions:

3) Path traversal (CVE-ID: CVE-2019-19102)

The vulnerability allows a local attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences in SharpZipLib used in the upgrade service. A local attacker can send a specially crafted HTTP request and read arbitrary files on the system.

This vulnerability affects the following versions:

Remediation

Install update from vendor's website.

References

• https://ics-cert.us-cert.gov/advisories/icsa-20-093-01
• https://www.br-automation.com/en-gb/service/cyber-security/