CyberSecBulletin
CVE-2022-36360NVD status: Modified

LOGO! 8 BM (incl. SIPLUS variants): Insufficient Verification of Data Authenticity

Published Updated By the CyberSecBulletin desk

CVE-2022-36360 is a high-severity insufficient verification of data authenticity vulnerability in LOGO! 8 BM (incl. SIPLUS variants) from Siemens, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected LOGO! 8 BM (incl. SIPLUS variants) versions: All versions < V8.3. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.3% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Logo! 8 Bm Firmware to 8.3 or a later version.
  2. Update Logo!8 Bm Fs-05 Firmware to 8.3 or a later version.
  3. Read the advisory on cert-portal.siemens.com for workarounds and exact fixed builds.
  4. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
SiemensLOGO! 8 BM (incl. SIPLUS variants)All versions < V8.3Not stated
SiemensLogo! 8 Bm Firmwarebefore 8.38.3
SiemensLogo!8 Bm Fs-05 Firmwarebefore 8.38.3

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
NoneNo data is disclosed.
Integrity
HighData or code can be modified at will.
Availability
NoneAvailability is not affected.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N. Scored by NVD.

Official description

A vulnerability has been identified in LOGO! 8 BM (incl. SIPLUS variants) (All versions < V8.3). Affected devices load firmware updates without checking the authenticity. Furthermore the integrity of the unencrypted firmware is only verified by a non-cryptographic method. This could allow an attacker to manipulate a firmware update and flash it to the device.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Insufficient Verification of Data Authenticity

The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.

More Insufficient Verification of Data Authenticity vulnerabilities (CWE-345)

Timeline

  1. CVE record published.
  2. Record last changed materially (score, affected products, status or references).

References

Recent Insufficient Verification of Data Authenticity vulnerabilities

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