Multiple vulnerabilities in Siemens Nucleus Products

Published: 2021-04-14

Risk	High
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2020-15795 CVE-2020-27009
CWE-ID	CWE-787 CWE-823
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Nucleus RTOS Server applications / Other server solutions Nucleus Source Code Server applications / Other server solutions VSTAR Server applications / Other server solutions Nucleus NET Server applications / Other server solutions
Vendor	Siemens

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Out-of-bounds write

EUVDB-ID: #VU52208

Risk: High

CVSSv4.0: 7.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-15795

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing untrusted input in the DNS domain name label parsing functionality. A remote attacker can trigger out-of-bounds write and execute arbitrary code on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Nucleus RTOS: All versions

Nucleus Source Code: All versions

VSTAR: All versions

Nucleus NET: before 5.2

CPE2.3

External links

https://ics-cert.us-cert.gov/advisories/icsa-21-103-04
https://cert-portal.siemens.com/productcert/pdf/ssa-185699.pdf

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Use of Out-of-range Pointer Offset

EUVDB-ID: #VU52209