Improper Null Termination in SIMOTICS CONNECT 400 - CVE-2020-27736
Published: April 14, 2021
Vulnerability identifier: #VU52204
CSH Severity: Medium
CVSS v4: 8.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-27736
CWE-ID: CWE-170
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to the DNS domain name label parsing functionality does not properly validate the null-terminated name in DNS-responses. A remote attacker can cause a denial of service condition or leak the read memory.
Affected software
SIMOTICS CONNECT 400
VSTAR
Nucleus Source Code
Nucleus RTOS
Nucleus NET
Nucleus 4
Nucleus ReadyStart
VSTAR
Nucleus Source Code
Nucleus RTOS
Nucleus NET
Nucleus 4
Nucleus ReadyStart
How to mitigate CVE-2020-27736
Install updates from vendor's website.
SIMOTICS CONNECT 400 - update to 0.5.0.0
Nucleus 4 - update to 4.1.0
Nucleus ReadyStart - update to 2017.02.3
Nucleus 4 - update to 4.1.0
Nucleus ReadyStart - update to 2017.02.3