Denial of service in Siemens SIMATIC NET CP Modules



Published: 2021-09-15
Risk Medium
Patch available NO
Number of vulnerabilities 1
CVE ID CVE-2021-33737
CWE ID CWE-119
Exploitation vector Network
Public exploit N/A
Vulnerable software
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SIMATIC CP 343-1 Advanced
Server applications / SCADA systems

SIMATIC CP 343-1 Standard
Server applications / SCADA systems

SIMATIC CP 343-1 ERPC
Hardware solutions / Firmware

SIMATIC CP 343-1 LEAN
Hardware solutions / Firmware

Vendor Siemens

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Buffer overflow

Risk: Medium

CVSSv3.1: 6.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:C] [PCI]

CVE-ID: CVE-2021-33737

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. A remote attacker can send a specially crafted packet, trigger memory corruption and cause a denial of service condition on the target system.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

SIMATIC CP 343-1 Advanced: All versions

SIMATIC CP 343-1 Standard: All versions

SIMATIC CP 343-1 ERPC: All versions

SIMATIC CP 343-1 LEAN: All versions

CPE External links

https://cert-portal.siemens.com/productcert/pdf/ssa-549234.pdf

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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



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