Denial of service in Siemens SIMATIC NET CP Modules

1) Buffer overflow

EUVDB-ID: #VU56625

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-2021-33737

CWE-ID: CWE-119 - Memory corruption

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

CPE2.3

• cpe:2.3:a:siemens:simatic_cp_343-1_advanced:*:*:*:*:*:*:*:*
• cpe:2.3:a:siemens:simatic_cp_343-1_standard:*:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:simatic_cp_343-1_erpc:*:*:*:*:*:*:*:*
• cpe:2.3:h:siemens:simatic_cp_343-1_lean:*:*:*:*:*:*:*:*

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.