#VU52209 Use of Out-of-range Pointer Offset in Siemens products - CVE-2020-27009

Vulnerability identifier: #VU52209

Vulnerability 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-2020-27009

CWE-ID: CWE-823

Exploitation vector: Network

Exploit availability: No

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

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to the DNS domain name record decompression functionality does not properly validate the pointer offset values. A remote atttacker can execute arbitrary code on the 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

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

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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.