CVE-2020-27736

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 label parsing functionality does not properly validate the null-terminated name in DNS-responses. The parsing of malformed responses could result in a read 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 or leak the read memory.

CVSS v3.0 6.5 MEDIUM
CVSS v2.0 5.8 MEDIUM

6.5^/10

CVSS v3.0 : MEDIUM

Vector :

Exploitability : 2.2 / Impact : 4.2

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

5.8^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:M/Au:N/C:P/I:N/A:P

Exploitability : 8.6 / Impact : 4.9

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact NONE

Availability Impact PARTIAL

References

Link	Resource
https://cert-portal.siemens.com/productcert/pdf/ssa-705111.pdf	Patch Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-669158.pdf	Patch Vendor Advisory

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Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:siemens:nucleus_net::::::::
	cpe:2.3:a:siemens:nucleus_source_code:-:::::::*
	cpe:2.3:a:siemens:nucleus_readystart_v3::::::::
	cpe:2.3:a:siemens:nucleus_readystart_v4::::::::

Configuration 2 (hide)

AND

cpe:2.3:o:siemens:simotics_connect_400_firmware:*:*:*:*:*:*:*:*

cpe:2.3:h:siemens:simotics_connect_400:-:*:*:*:*:*:*:*

Information

Published : 2021-04-22 14:15

Updated : 2022-08-05 10:13

NVD link : CVE-2020-27736

Mitre link : CVE-2020-27736

JSON object : View

CWE

CWE-125

Out-of-bounds Read

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Products Affected

siemens

nucleus_readystart_v3
simotics_connect_400_firmware
nucleus_source_code
simotics_connect_400
nucleus_readystart_v4
nucleus_net

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