SIMATIC Cloud Connect 7 CC712: Missing Standardized Error Handling Mechanism
CVE-2023-29105 is a high-severity missing standardized error handling mechanism vulnerability in SIMATIC Cloud Connect 7 CC712 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 SIMATIC Cloud Connect 7 CC712 versions: All versions >= V2.0 < V2.1; All versions < V2.1. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.55% 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 6gk1411-1ac00 Firmware to 2.1 or a later version.
- Update 6gk1411-5ac00 Firmware to 2.1 or a later version.
- Read the advisory on cert-portal.siemens.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Siemens | SIMATIC Cloud Connect 7 CC712 | All versions >= V2.0 < V2.1; All versions < V2.1 | Not stated |
| Siemens | SIMATIC Cloud Connect 7 CC716 | All versions >= V2.0 < V2.1; All versions < V2.1 | Not stated |
| Siemens | 6gk1411-1ac00 Firmware | before 2.1 | 2.1 |
| Siemens | 6gk1411-5ac00 Firmware | before 2.1 | 2.1 |
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 NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 5.9 | Medium | CNA (siemens.com) |
| CVSS 3.1 | 7.5 | High | NVD |
Official description
A vulnerability has been identified in SIMATIC Cloud Connect 7 CC712 (All versions >= V2.0 < V2.1), SIMATIC Cloud Connect 7 CC712 (All versions < V2.1), SIMATIC Cloud Connect 7 CC716 (All versions >= V2.0 < V2.1), SIMATIC Cloud Connect 7 CC716 (All versions < V2.1). The affected device is vulnerable to a denial of service while parsing a random (non-JSON) MQTT payload. This could allow an attacker who can manipulate the communication between the MQTT broker and the affected device to cause a denial of service (DoS).
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Missing Standardized Error Handling Mechanism
The product does not use a standardized method for handling errors throughout the code.
How developers prevent this class of flaw
- define a strategy for handling errors of different severities, such as fatal errors versus basic log events. Use or create built-in language features, or an external package, that provides an easy-to-use API and define coding standards for the detection and handling of errors.
More Missing Standardized Error Handling Mechanism vulnerabilities (CWE-544)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Other vulnerabilities in SIMATIC Cloud Connect 7 CC712
- 7.5 High severity
- 7.5 High severity
- 7.6 High severity
- 7.2 High severity
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