Multiple vulnerabilities in Siemens LOGO CMR and SIMATIC RTU 3000



Published: 2021-09-16
Risk Medium
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2021-37186
CVE-2020-36475
CVE-2020-36478
CWE-ID CWE-330
CWE-119
CWE-295
Exploitation vector Network
Public exploit N/A
Vulnerable software
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SIMATIC RTU 3000
Hardware solutions / Firmware

LOGO! CMR2020
Hardware solutions / Firmware

LOGO! CMR2040
Hardware solutions / Firmware

Vendor Siemens

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Use of insufficiently random values

EUVDB-ID: #VU56654

Risk: Low

CVSSv3.1: 4.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-37186

CWE-ID: CWE-330 - Use of Insufficiently Random Values

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to the underlying TCP/IP stack does not properly calculate the random numbers used as ISN (Initial Sequence Numbers). A remote attacker on the local network can spoof the connection and gain access to sensitive information.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

SIMATIC RTU 3000: All versions

LOGO! CMR2020: before 2.2

LOGO! CMR2040: before 2.2

CPE2.3 External links

http://cert-portal.siemens.com/productcert/pdf/ssa-316383.pdf

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Buffer overflow

EUVDB-ID: #VU56655

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-36475

CWE-ID: CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error when generating Diffie-Hellman key pairs. A remote attacker can trigger memory corruption and cause a denial of service condition on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

SIMATIC RTU 3000: All versions

LOGO! CMR2020: before 2.2

LOGO! CMR2040: before 2.2

CPE2.3 External links

http://github.com/ARMmbed/mbedtls/releases/tag/v2.16.9
http://github.com/ARMmbed/mbedtls/releases/tag/v2.25.0
http://github.com/ARMmbed/mbedtls/releases/tag/v2.7.18
http://cert-portal.siemens.com/productcert/pdf/ssa-756638.pdf

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Improper Certificate Validation

EUVDB-ID: #VU56657

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-36478

CWE-ID: CWE-295 - Improper Certificate Validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to improper certificate validation. A remote attacker can perform a man-in-the-middle (MitM) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

SIMATIC RTU 3000: All versions

LOGO! CMR2020: before 2.2

LOGO! CMR2040: before 2.2

CPE2.3 External links

http://github.com/ARMmbed/mbedtls/releases/tag/v2.16.9
http://github.com/ARMmbed/mbedtls/releases/tag/v2.25.0
http://github.com/ARMmbed/mbedtls/issues/3629
http://github.com/ARMmbed/mbedtls/releases/tag/v2.7.18
http://cert-portal.siemens.com/productcert/pdf/ssa-756638.pdf

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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