CVE-2020-27738 Information

Description

A vulnerability has been identified in Nucleus NET (All versions) Nucleus ReadyStart V3 (All versions < V2017.02.3) Nucleus ReadyStart V4 (All versions < V4.1.0) Nucleus Source Code (Versions including affected DNS modules) SIMOTICS CONNECT 400 (All versions < V0.5.0.0). The DNS domain name record decompression functionality does not properly validate the pointer offset values. The parsing of malformed responses could result in a read access past the end of an allocated structure. An attacker with a privileged position in the network could leverage this vulnerability to cause a denial-of-service condition.

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H

Reference

https://cert-portal.siemens.com/productcert/pdf/ssa-705111.pdf https://cert-portal.siemens.com/productcert/pdf/ssa-669158.pdf

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.4