Mendix Applications using Mendix 10: Authentication Bypass by Capture-replay
CVE-2023-45794 is a high-severity authentication bypass by capture-replay vulnerability in Mendix Applications using Mendix 10 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. Affected Mendix Applications using Mendix 10 versions: All versions < V10.4.0. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.44% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Mendix to 7.23.37 or 8.18.27 or 9.24.10 or 10.4.0, whichever matches your release line, or a later version.
- Read the advisory on cert-portal.siemens.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Siemens | Mendix Applications using Mendix 10 | All versions < V10.4.0 | Not stated |
| Siemens | Mendix Applications using Mendix 7 | All versions < V7.23.37 | Not stated |
| Siemens | Mendix Applications using Mendix 8 | All versions < V8.18.27 | Not stated |
| Siemens | Mendix Applications using Mendix 9 | All versions < V9.24.10 | Not stated |
| Siemens | Mendix | 7.0.0 up to, but not including, 7.23.37; 8.0.0 up to, but not including, 8.18.27; 9.0.0 up to, but not including, 9.24.10; 10.0.0 up to, but not including, 10.4.0 | 7.23.37, 8.18.27, 9.24.10, 10.4.0 |
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 system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 6.8 | Medium | CNA (siemens.com) |
| CVSS 3.1 | 8.1 | High | NVD |
Official description
A vulnerability has been identified in Mendix Applications using Mendix 10 (All versions < V10.4.0), Mendix Applications using Mendix 7 (All versions < V7.23.37), Mendix Applications using Mendix 8 (All versions < V8.18.27), Mendix Applications using Mendix 9 (All versions < V9.24.10). A capture-replay flaw in the platform could have an impact to apps built with the platform, if certain preconditions are met that depend on the app's model and access control design. This could allow authenticated attackers to access or modify objects without proper authorization, or escalate privileges in the context of the vulnerable app.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Authentication Bypass by Capture-replay
A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes).
How developers prevent this class of flaw
- Utilize some sequence or time stamping functionality along with a checksum which takes this into account in order to ensure that messages can be parsed only once.
- Since any attacker who can listen to traffic can see sequence numbers, it is necessary to sign messages with some kind of cryptography to ensure that sequence numbers are not simply doctored along with content.
More Authentication Bypass by Capture-replay vulnerabilities (CWE-294)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Recent Authentication Bypass by Capture-replay vulnerabilities
- 7.5 High severity
- 8.1 High severity
- 7.5 High severity
- 9.1 Critical severity
- 9.1 Critical severity
- 7.5 High severity
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