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ID

VAR-202104-1839


CVE

CVE-2020-15795


TITLE

Siemens Nucleus product out-of-bounds write vulnerability

Trust: 0.6

sources: CNVD: CNVD-2021-28702

DESCRIPTION

A vulnerability has been identified in APOGEE PXC Compact (BACnet) (All versions < V3.5.5), APOGEE PXC Compact (P2 Ethernet) (All versions < V2.8.20), APOGEE PXC Modular (BACnet) (All versions < V3.5.5), APOGEE PXC Modular (P2 Ethernet) (All versions < V2.8.20), Nucleus NET (All versions < V5.2), Nucleus Source Code (Versions including affected DNS modules), TALON TC Compact (BACnet) (All versions < V3.5.5), TALON TC Modular (BACnet) (All versions < V3.5.5). 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. The Nucleus NET module contains a series of standard-compliant network and communication protocols, drivers and utilities to provide full-featured network support in any embedded device. Siemens Nucleus products have cross-border write vulnerabilities. Pillow is a Python-based image processing library. There is currently no information about this vulnerability, please feel free to follow CNNVD or manufacturer announcements

Trust: 2.07

sources: NVD: CVE-2020-15795 // CNVD: CNVD-2021-28702 // CNNVD: CNNVD-202104-975 // VULMON: CVE-2020-15795

IOT TAXONOMY

category:['ICS']sub_category: -

Trust: 0.6

sources: CNVD: CNVD-2021-28702

AFFECTED PRODUCTS

vendor:siemensmodel:nucleus netscope:ltversion:5.2

Trust: 1.0

vendor:siemensmodel:nucleus source codescope:eqversion: -

Trust: 1.0

vendor:siemensmodel:nucleus netscope:ltversion:v5.2

Trust: 0.6

vendor:siemensmodel:nucleus rtosscope: - version: -

Trust: 0.6

vendor:siemensmodel:nucleus source codescope: - version: -

Trust: 0.6

vendor:siemensmodel:vstarscope: - version: -

Trust: 0.6

sources: CNVD: CNVD-2021-28702 // NVD: CVE-2020-15795

CVSS

SEVERITY

CVSSV2

CVSSV3

nvd@nist.gov: CVE-2020-15795
value: HIGH

Trust: 1.0

productcert@siemens.com: CVE-2020-15795
value: HIGH

Trust: 1.0

CNVD: CNVD-2021-28702
value: HIGH

Trust: 0.6

CNNVD: CNNVD-202104-975
value: MEDIUM

Trust: 0.6

CNNVD: CNNVD-202104-998
value: HIGH

Trust: 0.6

VULMON: CVE-2020-15795
value: MEDIUM

Trust: 0.1

nvd@nist.gov: CVE-2020-15795
severity: MEDIUM
baseScore: 6.8
vectorString: AV:N/AC:M/AU:N/C:P/I:P/A:P
accessVector: NETWORK
accessComplexity: MEDIUM
authentication: NONE
confidentialityImpact: PARTIAL
integrityImpact: PARTIAL
availabilityImpact: PARTIAL
exploitabilityScore: 8.6
impactScore: 6.4
acInsufInfo: NONE
obtainAllPrivilege: NONE
obtainUserPrivilege: NONE
obtainOtherPrivilege: NONE
userInteractionRequired: NONE
version: 2.0

Trust: 1.1

CNVD: CNVD-2021-28702
severity: HIGH
baseScore: 7.6
vectorString: AV:N/AC:H/AU:N/C:C/I:C/A:C
accessVector: NETWORK
accessComplexity: HIGH
authentication: NONE
confidentialityImpact: COMPLETE
integrityImpact: COMPLETE
availabilityImpact: COMPLETE
exploitabilityScore: 4.9
impactScore: 10.0
acInsufInfo: NONE
obtainAllPrivilege: NONE
obtainUserPrivilege: NONE
obtainOtherPrivilege: NONE
userInteractionRequired: NONE
version: 2.0

Trust: 0.6

nvd@nist.gov: CVE-2020-15795
baseSeverity: HIGH
baseScore: 8.1
vectorString: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
attackVector: NETWORK
attackComplexity: HIGH
privilegesRequired: NONE
userInteraction: NONE
scope: UNCHANGED
confidentialityImpact: HIGH
integrityImpact: HIGH
availabilityImpact: HIGH
exploitabilityScore: 2.2
impactScore: 5.9
version: 3.1

Trust: 2.0

sources: CNVD: CNVD-2021-28702 // VULMON: CVE-2020-15795 // CNNVD: CNNVD-202104-975 // CNNVD: CNNVD-202104-998 // NVD: CVE-2020-15795 // NVD: CVE-2020-15795

PROBLEMTYPE DATA

problemtype:CWE-787

Trust: 1.0

sources: NVD: CVE-2020-15795

THREAT TYPE

remote

Trust: 0.6

sources: CNNVD: CNNVD-202104-998

TYPE

other

Trust: 0.6

sources: CNNVD: CNNVD-202104-975

PATCH

title:siemens Nucleus Buffer error vulnerability fixurl:http://www.cnnvd.org.cn/web/xxk/bdxqById.tag?id=148259

Trust: 0.6

title:Siemens Security Advisories: Siemens Security Advisoryurl:https://vulmon.com/vendoradvisory?qidtp=siemens_security_advisories&qid=01a7c311af93ac6e3744c16b5c159592

Trust: 0.1

sources: VULMON: CVE-2020-15795 // CNNVD: CNNVD-202104-998

EXTERNAL IDS

db:SIEMENSid:SSA-185699

Trust: 2.3

db:NVDid:CVE-2020-15795

Trust: 2.3

db:SIEMENSid:SSA-180579

Trust: 1.0

db:ICS CERTid:ICSA-21-103-04

Trust: 0.7

db:CNVDid:CNVD-2021-28702

Trust: 0.6

db:CS-HELPid:SB2021041363

Trust: 0.6

db:CNNVDid:CNNVD-202104-975

Trust: 0.6

db:AUSCERTid:ESB-2021.1246

Trust: 0.6

db:CS-HELPid:SB2021041409

Trust: 0.6

db:CNNVDid:CNNVD-202104-998

Trust: 0.6

db:VULMONid:CVE-2020-15795

Trust: 0.1

sources: CNVD: CNVD-2021-28702 // VULMON: CVE-2020-15795 // CNNVD: CNNVD-202104-975 // CNNVD: CNNVD-202104-998 // NVD: CVE-2020-15795

REFERENCES

url:https://cert-portal.siemens.com/productcert/pdf/ssa-185699.pdf

Trust: 2.3

url:https://us-cert.cisa.gov/ics/advisories/icsa-21-103-04

Trust: 1.3

url:https://cert-portal.siemens.com/productcert/pdf/ssa-180579.pdf

Trust: 1.0

url:https://www.cybersecurity-help.cz/vdb/sb2021041363

Trust: 0.6

url:https://www.auscert.org.au/bulletins/esb-2021.1246

Trust: 0.6

url:https://www.cybersecurity-help.cz/vdb/sb2021041409

Trust: 0.6

url:https://nvd.nist.gov/vuln/detail/cve-2020-15795

Trust: 0.6

url:https://cwe.mitre.org/data/definitions/787.html

Trust: 0.1

url:https://nvd.nist.gov

Trust: 0.1

url:https://cert-portal.siemens.com/productcert/txt/ssa-185699.txt

Trust: 0.1

sources: CNVD: CNVD-2021-28702 // VULMON: CVE-2020-15795 // CNNVD: CNNVD-202104-975 // CNNVD: CNNVD-202104-998 // NVD: CVE-2020-15795

CREDITS

Daniel dos Santos, from Forescout Technologies, and Siemens reported these vulnerabilities to CISA.

Trust: 0.6

sources: CNNVD: CNNVD-202104-998

SOURCES

db:CNVDid:CNVD-2021-28702
db:VULMONid:CVE-2020-15795
db:CNNVDid:CNNVD-202104-975
db:CNNVDid:CNNVD-202104-998
db:NVDid:CVE-2020-15795

LAST UPDATE DATE

2024-08-14T12:53:25.881000+00:00


SOURCES UPDATE DATE

db:CNVDid:CNVD-2021-28702date:2021-04-19T00:00:00
db:VULMONid:CVE-2020-15795date:2021-04-30T00:00:00
db:CNNVDid:CNNVD-202104-975date:2021-04-14T00:00:00
db:CNNVDid:CNNVD-202104-998date:2022-01-12T00:00:00
db:NVDid:CVE-2020-15795date:2023-08-08T10:15:11.090

SOURCES RELEASE DATE

db:CNVDid:CNVD-2021-28702date:2021-04-15T00:00:00
db:VULMONid:CVE-2020-15795date:2021-04-22T00:00:00
db:CNNVDid:CNNVD-202104-975date:2021-04-13T00:00:00
db:CNNVDid:CNNVD-202104-998date:2021-04-13T00:00:00
db:NVDid:CVE-2020-15795date:2021-04-22T21:15:09.090