Vulnerability CVE-2020-15795


Published: 2021-04-22   Modified: 2021-04-23

Description:
A vulnerability has been identified in Nucleus NET (All versions < V5.2), Nucleus RTOS (versions including affected DNS modules), Nucleus Source Code (versions including affected DNS modules), VSTAR (versions including affected DNS modules). The DNS domain name label parsing functionality does not properly validate the names in DNS-responses. The parsing of malformed responses could result in a write past the end of an allocated structure. An attacker with a privileged position in the network could leverage this vulnerability to execute code in the context of the current process or cause a denial-of-service condition.

Type:

CWE-787

CVSS2 => (AV:N/AC:M/Au:N/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
6.8/10
6.4/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
Siemens -> Nucleus net 
Siemens -> Nucleus rtos 
Siemens -> Vstar 
Siemens -> Nucleus source code 

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

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