#VU64413 Improper validation of integrity check value in Siemens products - CVE-2021-37182

Vulnerability identifier: #VU64413

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-37182

CWE-ID: CWE-354

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SCALANCE XM408-4C
Hardware solutions / Routers & switches, VoIP, GSM, etc
SCALANCE XM408-8C
Hardware solutions / Routers & switches, VoIP, GSM, etc
SCALANCE XM416-4C
Hardware solutions / Routers & switches, VoIP, GSM, etc
SCALANCE XR524-8C 1x230V
Hardware solutions / Routers & switches, VoIP, GSM, etc
SCALANCE XR524-8C 2x230V
Hardware solutions / Routers & switches, VoIP, GSM, etc
SCALANCE XR524-8C 24V
Hardware solutions / Routers & switches, VoIP, GSM, etc
SCALANCE XR526-8C 1x230V
Hardware solutions / Routers & switches, VoIP, GSM, etc
SCALANCE XR526-8C 2x230V
Hardware solutions / Routers & switches, VoIP, GSM, etc
SCALANCE XR526-8C 24V
Hardware solutions / Routers & switches, VoIP, GSM, etc
SCALANCE XR528-6M
Hardware solutions / Routers & switches, VoIP, GSM, etc
SCALANCE XR552-12M
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Siemens

Description

The vulnerability allows a remote attacker to bypass integrity checks.

The vulnerability exists due to a weak algorithm in the OSPF protocol implementation. A remote attacker can send specially crafted OSPF packets and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

SCALANCE XM408-4C: before 6.5

SCALANCE XM408-8C: before 6.5

SCALANCE XM416-4C: before 6.5

SCALANCE XR524-8C 1x230V: before 6.5

SCALANCE XR524-8C 2x230V: before 6.5

SCALANCE XR524-8C 24V: before 6.5

SCALANCE XR526-8C 1x230V: before 6.5

SCALANCE XR526-8C 2x230V: before 6.5

SCALANCE XR526-8C 24V: before 6.5

SCALANCE XR528-6M: before 6.5

SCALANCE XR552-12M: before 6.5

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External links
http://cert-portal.siemens.com/productcert/pdf/ssa-145224.pdf

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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.