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[email protected]NVD:CVE-2020-27632

HistoryMar 10, 2021 - 6:15 p.m.

CVE-2020-27632

2021-03-1018:15:12

[email protected]

web.nvd.nist.gov

simatic mv400

isn generator

tcp sessions

vulnerability

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

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

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

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

EPSS

0.001

Percentile

42.9%

JSON

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.

Affected configurations

Nvd

Node

siemenssimatic_mv420Match-

AND

siemenssimatic_mv420_firmwareRange<7.0.6

Node

siemenssimatic_mv440Match-

AND

siemenssimatic_mv440_firmwareRange<7.0.6

References

cert-portal.siemens.com/productcert/pdf/ssa-599268.pdf

www.cisa.gov/news-events/ics-advisories/icsa-21-042-01

www.forescout.com/resources/numberjack-weak-isn-generation-in-embedded-tcpip-stacks/

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

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

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

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

EPSS

0.001

Percentile

42.9%

JSON

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