RUT model routers: External Control of System or Configuration Setting
CVE-2023-32349 is a high-severity external control of system or configuration setting vulnerability in RUT model routers from Teltonika, 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. Affected RUT model routers versions: 00.07.03.4 and earlier. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 1.09% chance of exploitation within 30 days, higher than 66% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of RUT model routers you run against the affected versions below, and install the vendor's latest release.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Teltonika | RUT model routers | 00.07.03.4 and earlier | Not stated |
| Teltonika-networks | Rut200 Firmware | 00.07.03.4 and earlier | Not stated |
| Teltonika-networks | Rut240 Firmware | 00.07.03.4 and earlier | Not stated |
| Teltonika-networks | Rut241 Firmware | 00.07.03.4 and earlier | Not stated |
| Teltonika-networks | Rut300 Firmware | 00.07.03.4 and earlier | Not stated |
| Teltonika-networks | Rut360 Firmware | 00.07.03.4 and earlier | Not stated |
| Teltonika-networks | Rut901 Firmware | 00.07.03.4 and earlier | Not stated |
| Teltonika-networks | Rut950 Firmware | 00.07.03.4 and earlier | Not stated |
| Teltonika-networks | Rut951 Firmware | 00.07.03.4 and earlier | Not stated |
| Teltonika-networks | Rut955 Firmware | 00.07.03.4 and earlier | Not stated |
| Teltonika-networks | Rut956 Firmware | 00.07.03.4 and earlier | Not stated |
| Teltonika-networks | Rutx08 Firmware | 00.07.03.4 and earlier | Not stated |
| Teltonika-networks | Rutx09 Firmware | 00.07.03.4 and earlier | Not stated |
| Teltonika-networks | Rutx10 Firmware | 00.07.03.4 and earlier | Not stated |
| Teltonika-networks | Rutx11 Firmware | 00.07.03.4 and earlier | Not stated |
| Teltonika-networks | Rutx12 Firmware | 00.07.03.4 and earlier | Not stated |
| Teltonika-networks | Rutx14 Firmware | 00.07.00 through 00.07.03.4 | Not stated |
| Teltonika-networks | Rutx50 Firmware | 00.07.00 through 00.07.03.4 | Not stated |
| Teltonika-networks | Rutxr1 Firmware | 00.07.00 through 00.07.03.4 | Not 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 system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 8.0 | High | CNA (hq.dhs.gov) |
| CVSS 3.1 | 8.8 | High | NVD |
Official description
Version 00.07.03.4 and prior of Teltonika’s RUT router firmware contain a packet dump utility that contains proper validation for filter parameters. However, variables for validation checks are stored in an external configuration file. An authenticated attacker could use an exposed UCI configuration utility to change these variables and enable malicious parameters in the dump utility, which could result in arbitrary code execution.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: External Control of System or Configuration Setting
One or more system settings or configuration elements can be externally controlled by a user.
How developers prevent this class of flaw
- 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.
- Because setting manipulation covers a diverse set of functions, any attempt at illustrating it will inevitably be incomplete. Rather than searching for a tight-knit relationship between the functions addressed in the setting manipulation category, take a step back and consider the sorts of system values that an attacker should not be allowed to control.
- In general, do not allow user-provided or otherwise untrusted data to control sensitive values. The leverage that an attacker gains by controlling these values is not always immediately obvious, but do not underestimate the creativity of the attacker.
More External Control of System or Configuration Setting vulnerabilities (CWE-15)
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
Third-party and government advisories
- cisa.gov/news-events/ics-advisories/icsa-23-131-08Third Party Advisory, US Government Resource
Other vulnerabilities in RUT model routers
- 8.8 High severity
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