SB2020040611 - Multiple vulnerabilities in B&R Automation Studio

Description

This security bulletin contains information about 3 vulnerabilities.

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

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

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)

CWE-ID: CWE-325 - Missing Required Cryptographic Step

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

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)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

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/