CyberSecBulletin
CVE-2022-24309NVD status: Analyzed

Mendix Runtime V7: Improper Access Control

Published Updated By the CyberSecBulletin desk

CVE-2022-24309 is a high-severity improper access control vulnerability in Mendix Runtime V7 from Siemens, with a CVSS 3.1 base score of 8.1 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 version V7.23.29 as the first without the flaw, so updating Mendix Runtime V7 to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.6% 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 Mendix Runtime V7 to V7.23.29 or a later version.
  2. Update Mendix Runtime V8 to V8.18.16 or a later version.
  3. Update Mendix Runtime V9 to V9.13 or a later version.
  4. Read the advisory on cert-portal.siemens.com for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
SiemensMendix Runtime V7before V7.23.29V7.23.29
SiemensMendix Runtime V8before V8.18.16V8.18.16
SiemensMendix Runtime V9before V9.13V9.13
MendixMendixbefore 7.23.29; 8.0.0 up to, but not including, 8.18.16; 9.0.0 up to, but not including, 9.137.23.29, 8.18.16, 9.13

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
NoneAvailability is not affected.

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

Scoring systemScoreSeverityScored by
CVSS 3.16.8MediumCNA (siemens.com)
CVSS 3.18.1HighNVD
CVSS 2.04.9MediumNVD

Official description

A vulnerability has been identified in Mendix Runtime V7 (All versions < V7.23.29), Mendix Runtime V8 (All versions < V8.18.16), Mendix Runtime V9 (All versions < V9.13 only with Runtime Custom Setting *DataStorage.UseNewQueryHandler* set to False). If an entity has an association readable by the user, then in some cases, Mendix Runtime may not apply checks for XPath constraints that parse said associations, within apps running on affected versions. A malicious user could use this to dump and manipulate sensitive data.

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

The underlying weakness: Improper Access Control

The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

How developers prevent this class of flaw

  • Very carefully manage the setting, management, and handling of privileges. Explicitly manage trust zones in the software.
  • Compartmentalize the system to have safe areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area. Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.

More Improper Access Control vulnerabilities (CWE-284)

Timeline

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

References

Recent Improper Access Control vulnerabilities

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