CyberSecBulletin
CVE-2024-8751NVD status: Deferred

MSC800: Missing Authentication for Critical Functionality

Published Updated By the CyberSecBulletin desk

CVE-2024-8751 is a high-severity missing authentication for critical functionality vulnerability in MSC800 from SICK, 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 MSC800 versions: V1.0 through <=V4.25; S1.0 through <=S2.93.19. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.93% chance of exploitation within 30 days, higher than 61% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Check which version of MSC800 you run against the affected versions below, and install the vendor's latest release.
  2. Read the advisory on sick.com for workarounds and exact fixed builds.
  3. 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
SICKMSC800V1.0 through <=V4.25; S1.0 through <=S2.93.19Not stated
Endress+HauserMARSIC200all versionsNot stated
Endress+HauserMARSIC280all versionsNot stated
Endress+HauserMARSIC300all versionsNot stated
Endress+HauserMCS100FTall versionsNot stated
Endress+HauserMCS200HWall versionsNot stated
Endress+HauserMCS300Pall versionsNot stated
Endress+HauserMERCEM300Zall versionsNot stated
Endress+HauserSAM800all versionsNot stated
Endress+HauserSIPROCESSall versionsNot stated
Endress+HauserGMS800all versionsNot stated
Endress+HauserGMS800 FIDORall versionsNot stated
Endress+HauserGM32all versionsNot stated
Endress+HauserVICOTEC320all versionsNot stated
Endress+HauserMCU ETH-Service and Modbus-TCP Moduleall versionsNot stated
Endress+HauserFLPSall versionsNot stated
Endress+HauserMES1B B&B Converterall versionsNot stated
Sickmsc800_firmware1.0 through 4.25; 1.0 through s2.93.19Not stated

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
NoneNothing can be modified.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by CNA (sick.de).

Official description

A vulnerability allows a remote unauthenticated attacker to modify the prod uct’s IP address over the Sopas ET interface. This can lead to a Denial of Service attack.

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

The underlying weakness: Missing Authentication for Critical Functionality

The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

How developers prevent this class of flaw

  • For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
  • Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. For example, consider using libraries with authentication capabilities such as OpenSSL or the ESAPI Authenticator.
  • When storing data in the cloud (e.g., S3 buckets, Azure blobs, Google Cloud Storage, etc.), use the provider's controls to require strong authentication for users who should be allowed to access the data.

More Missing Authentication for Critical Functionality vulnerabilities (CWE-306)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Advisories

Recent Missing Authentication for Critical Functionality vulnerabilities

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