CVE-2020-27632

In SIMATIC MV400 family versions prior to v7.0.6, the ISN generator is initialized with a constant value and has constant increments. An attacker could predict and hijack TCP sessions.

CVSS v3 7.5 HIGH
CVSS v2.0 5.0 MEDIUM

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

5.0^/10

CVSS v2.0 : MEDIUM

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

Exploitability : 10.0 / Impact : 2.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

References

Link	Resource
https://cert-portal.siemens.com/productcert/pdf/ssa-599268.pdf	Vendor Advisory
https://www.cisa.gov/news-events/ics-advisories/icsa-21-042-01
https://www.forescout.com/resources/numberjack-weak-isn-generation-in-embedded-tcpip-stacks/

Configurations

Configuration 1 (hide)

AND

cpe:2.3:o:siemens:simatic_mv420_firmware:*:*:*:*:*:*:*:*

cpe:2.3:h:siemens:simatic_mv420:-:*:*:*:*:*:*:*

Configuration 2 (hide)

AND

cpe:2.3:o:siemens:simatic_mv440_firmware:*:*:*:*:*:*:*:*

cpe:2.3:h:siemens:simatic_mv440:-:*:*:*:*:*:*:*

History

10 Oct 2023, 17:15

Type	Values Removed	Values Added
References		(MISC) https://www.cisa.gov/news-events/ics-advisories/icsa-21-042-01 - (MISC) https://www.forescout.com/resources/numberjack-weak-isn-generation-in-embedded-tcpip-stacks/ -

Information

Published : 2021-03-10 18:15

Updated : 2024-02-28 18:08

NVD link : CVE-2020-27632

Mitre link : CVE-2020-27632

CVE.ORG link : CVE-2020-27632

JSON object : View

Products Affected

siemens

simatic_mv440_firmware
simatic_mv420
simatic_mv440
simatic_mv420_firmware

CWE

NVD-CWE-noinfo

{"id": "CVE-2020-27632", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 5.0, "accessVector": "NETWORK", "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "LOW", "availabilityImpact": "NONE", "confidentialityImpact": "NONE"}, "acInsufInfo": false, "impactScore": 2.9, "baseSeverity": "MEDIUM", "obtainAllPrivilege": false, "exploitabilityScore": 10.0, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "published": "2021-03-10T18:15:12.797", "references": [{"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-599268.pdf", "tags": ["Vendor Advisory"], "source": "cve@mitre.org"}, {"url": "https://www.cisa.gov/news-events/ics-advisories/icsa-21-042-01", "source": "cve@mitre.org"}, {"url": "https://www.forescout.com/resources/numberjack-weak-isn-generation-in-embedded-tcpip-stacks/", "source": "cve@mitre.org"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "descriptions": [{"lang": "en", "value": "In SIMATIC MV400 family versions prior to v7.0.6, the ISN generator is initialized with a constant value and has constant increments. An attacker could predict and hijack TCP sessions."}, {"lang": "es", "value": "En la familia SIMATIC MV400 versiones anteriores a la v7.0.6, el generador ISN es inicializado con un valor constante y presenta incrementos constantes. Un atacante podr\u00eda predecir y secuestrar sesiones de TCP"}], "lastModified": "2023-10-10T17:15:10.510", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:siemens:simatic_mv420_firmware:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AA65BD0C-3249-4AB6-A066-C55ADC06EDB7", "versionEndExcluding": "7.0.6"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:h:siemens:simatic_mv420:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "79B15C1B-2510-434B-A589-5903CA0C00EE"}], "operator": "OR"}], "operator": "AND"}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:siemens:simatic_mv440_firmware:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "2FCC833E-AA77-471E-87CA-40B5E354163F", "versionEndExcluding": "7.0.6"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:h:siemens:simatic_mv440:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "6408042E-7E06-4AED-9853-29B176EDFE9F"}], "operator": "OR"}], "operator": "AND"}], "sourceIdentifier": "cve@mitre.org"}