CyberSecBulletin
CVE-2023-4419NVD status: Modified

LMS5xx: Use of Hard-coded Credentials

Published Updated By the CyberSecBulletin desk

CVE-2023-4419 is a high-severity use of hard-coded credentials vulnerability in LMS5xx from SICK, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. The record lists versions V2.21, 2.21 as the first without the flaw, so updating LMS5xx to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.95% chance of exploitation within 30 days, higher than 62% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update LMS5xx to V2.21 or 2.21, whichever matches your release line, or a later version.
  2. Read the advisory on sick.com for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
SICKLMS5xxbefore V2.21; before 2.21V2.21, 2.21
SickLms531 FirmwareNot specified in the recordNot stated
SickLms511 FirmwareNot specified in the recordNot stated
SickLms500 FirmwareNot specified in the recordNot 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
LowA basic user account is enough.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

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

Scoring systemScoreSeverityScored by
CVSS 3.19.8CriticalCNA (sick.de)
CVSS 3.18.8HighNVD

Official description

The LMS5xx uses hard-coded credentials, which potentially allow low-skilled unauthorized remote attackers to reconfigure settings and /or disrupt the functionality of the device.

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

The underlying weakness: Use of Hard-coded Credentials

The product contains hard-coded credentials, such as a password or cryptographic key.

How developers prevent this class of flaw

  • For outbound authentication: store passwords, keys, and other credentials outside of the code in a strongly-protected, encrypted configuration file or database that is protected from access by all outsiders, including other local users on the same system. Properly protect the key (CWE-320). If you cannot use encryption to protect the file, then make sure that the permissions are as restrictive as possible. In Windows environments, the Encrypted File System (EFS) may provide some protection.
  • For inbound authentication: Rather than hard-code a default username and password, key, or other authentication credentials for first time logins, utilize a first login mode that requires the user to enter a unique strong password or key.
  • If the product must contain hard-coded credentials or they cannot be removed, perform access control checks and limit which entities can access the feature that requires the hard-coded credentials. For example, a feature might only be enabled through the system console instead of through a network connection.

More Use of Hard-coded Credentials vulnerabilities (CWE-798)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in LMS5xx

All LMS5xx vulnerabilities

Recent Use of Hard-coded Credentials vulnerabilities

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