InterMesh 7177 Hybrid 2.0 Subscriber: Execution with Unnecessary Privileges
CVE-2024-47903 is a critical-severity execution with unnecessary privileges vulnerability in InterMesh 7177 Hybrid 2.0 Subscriber from Siemens, with a CVSS 3.1 base score of 9.1 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version V8.2.12 as the first without the flaw, so updating InterMesh 7177 Hybrid 2.0 Subscriber to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.37% chance of exploitation within 30 days, which is low compared with other CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Update InterMesh 7177 Hybrid 2.0 Subscriber to V8.2.12 or a later version.
- Update InterMesh 7707 Fire Subscriber to V7.2.12 or a later version.
- Update Intermesh 7707 Fire Subscriber Firmware to 7.2.12 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 | InterMesh 7177 Hybrid 2.0 Subscriber | before V8.2.12 | V8.2.12 |
| Siemens | InterMesh 7707 Fire Subscriber | before V7.2.12 | V7.2.12 |
| Siemens | Intermesh 7707 Fire Subscriber Firmware | before 7.2.12 | 7.2.12 |
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
- 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:N/UI:N/S:U/C:N/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 6.9 | Medium | CNA (siemens.com) |
| CVSS 3.1 | 5.8 | Medium | CNA (siemens.com) |
| CVSS 3.1 | 9.1 | Critical | NVD |
Official description
A vulnerability has been identified in InterMesh 7177 Hybrid 2.0 Subscriber (All versions < V8.2.12), InterMesh 7707 Fire Subscriber (All versions < V7.2.12 only if the IP interface is enabled (which is not the default configuration)). The web server of affected devices allows to write arbitrary files to the web server's DocumentRoot directory.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Execution with Unnecessary Privileges
The product performs an operation at a privilege level that is higher than the minimum level required, which creates new weaknesses or amplifies the consequences of other weaknesses.
How developers prevent this class of flaw
- Run your code using the lowest privileges that are required to accomplish the necessary tasks. If possible, create isolated accounts with limited privileges that are only used for a single task. That way, a successful attack will not immediately give the attacker access to the rest of the software or its environment. For example, database applications rarely need to run as the database administrator, especially in day-to-day operations.
- Identify the functionality that requires additional privileges, such as access to privileged operating system resources. Wrap and centralize this functionality if possible, and isolate the privileged code as much as possible from other code. Raise privileges as late as possible, and drop them as soon as possible to avoid CWE-271. Avoid weaknesses such as CWE-288 and CWE-420 by protecting all possible communication channels that could interact with the privileged code, such as a secondary socket that is only intended to be accessed by administrators.
- Identify the functionality that requires additional privileges, such as access to privileged operating system resources. Wrap and centralize this functionality if possible, and isolate the privileged code as much as possible from other code. Raise privileges as late as possible, and drop them as soon as possible to avoid CWE-271. Avoid weaknesses such as CWE-288 and CWE-420 by protecting all possible communication channels that could interact with the privileged code, such as a secondary socket that is only intended to be accessed by administrators.
More Execution with Unnecessary Privileges vulnerabilities (CWE-250)
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 InterMesh 7177 Hybrid 2.0 Subscriber
- 7.8 High severity
- 9.8 Critical severity
- 9.8 Critical severity
Recent Execution with Unnecessary Privileges vulnerabilities
- 8.8 High severity
- 7.8 High severity
- 9.9 Critical severity
- 9.1 Critical severity
- 9.1 Critical severity
- 8.8 High severity
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