PT-2024-2660 · Siemens · Simatic Cp 343-1+3

Published 2024-02-13 · Updated 2024-12-16 · CVE-2023-51440

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions SIMATIC CP 343-1 versions All SIMATIC CP 343-1 Lean versions All SIPLUS NET CP 343-1 versions All SIPLUS NET CP 343-1 Lean versions All

Description A vulnerability has been identified in the affected products, which incorrectly validate TCP sequence numbers. This could allow an unauthenticated remote attacker to create a denial of service condition by injecting spoofed TCP RST packets. The issue is related to insufficient validation of the communication channel source, allowing a remote attacker to cause a denial of service by sending specially crafted TCP RST packets.

Recommendations For SIMATIC CP 343-1, consider disabling the TCP validation function until a patch is available. For SIMATIC CP 343-1 Lean, restrict access to the communication module to minimize the risk of exploitation. For SIPLUS NET CP 343-1, avoid using the affected communication protocol until the issue is resolved. For SIPLUS NET CP 343-1 Lean, as a temporary workaround, consider blocking incoming TCP RST packets to prevent denial of service conditions. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Weakness Enumeration

CWE-940

Related Identifiers

BDU:2024-02727

CVE-2023-51440

Affected Products

Simatic Cp 343-1

Simatic Cp 343-1 Lean

Siplus Net Cp 343-1

Siplus Net Cp 343-1 Lean

References · 7

• https://safe-surf.ru/upload/VULN-new/VULN.2024-02-21.1.pdf · Security Note
• https://cert-portal.siemens.com/productcert/html/ssa-516818.html · Vendor Advisory
• https://bdu.fstec.ru/vul/2024-02727 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2023-51440 · Security Note
• https://vuldb.com/?id.253535 · Note
• https://t.me/cvenotify/104380 · Telegram Post
• https://cybersecurity-help.cz/vdb/SB2024021535 · Note