Multiple vulnerabilities in Siemens LOGO CMR and SIMATIC RTU 3000
| 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 |
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
CVSSv4.0: 1.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2021-37186
CWE-ID:
CWE-330 - Use of Insufficiently Random Values
Exploit availability: No
DescriptionThe 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.
MitigationInstall updates from vendor's website.
Vulnerable software versionsSIMATIC RTU 3000: All versions
LOGO! CMR2020: before 2.2
LOGO! CMR2040: before 2.2
CPE2.3- cpe:2.3:h:siemens:simatic_rtu_3000:*:*:*:*:*:*:*:*
- cpe:2.3:h:siemens:logo_cmr2020:*:*:*:*:*:*:*:*
- cpe:2.3:h:siemens:logo_cmr2040:*:*:*:*:*:*:*:*
https://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
CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2020-36475
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: No
DescriptionThe 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.
MitigationInstall updates from vendor's website.
Vulnerable software versionsSIMATIC RTU 3000: All versions
LOGO! CMR2020: before 2.2
LOGO! CMR2040: before 2.2
CPE2.3- cpe:2.3:h:siemens:simatic_rtu_3000:*:*:*:*:*:*:*:*
- cpe:2.3:h:siemens:logo_cmr2020:*:*:*:*:*:*:*:*
- cpe:2.3:h:siemens:logo_cmr2040:*:*:*:*:*:*:*:*
https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.9
https://github.com/ARMmbed/mbedtls/releases/tag/v2.25.0
https://github.com/ARMmbed/mbedtls/releases/tag/v2.7.18
https://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
CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2020-36478
CWE-ID:
CWE-295 - Improper Certificate Validation
Exploit availability: No
DescriptionThe 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.
MitigationInstall updates from vendor's website.
Vulnerable software versionsSIMATIC RTU 3000: All versions
LOGO! CMR2020: before 2.2
LOGO! CMR2040: before 2.2
CPE2.3- cpe:2.3:h:siemens:simatic_rtu_3000:*:*:*:*:*:*:*:*
- cpe:2.3:h:siemens:logo_cmr2020:*:*:*:*:*:*:*:*
- cpe:2.3:h:siemens:logo_cmr2040:*:*:*:*:*:*:*:*
https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.9
https://github.com/ARMmbed/mbedtls/releases/tag/v2.25.0
https://github.com/ARMmbed/mbedtls/issues/3629
https://github.com/ARMmbed/mbedtls/releases/tag/v2.7.18
https://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.
