tx9_v1_firmware: Improper Access Control
CVE-2023-47422 is a high-severity improper access control vulnerability in tx9_v1_firmware from Tenda, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited from the same local network by an unauthenticated attacker, without any action from a user. Affected tx9_v1_firmware versions: 22.03.02.54. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.49% 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
- Check which version of tx9_v1_firmware you run against the affected versions below, and install the vendor's latest release.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Tenda | tx9_v1_firmware | 22.03.02.54 | Not stated |
| Tenda | ax3_firmware | 16.03.12.11 | Not stated |
| Tenda | ax9_firmware | 22.03.01.46 | Not stated |
| Tenda | ax12_firmware | 22.03.01.46 | Not stated |
| Tenda | Tx9 Firmware | 22.03.02.54 | 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
- AdjacentThe attacker must be on the same local network segment.
- 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
- 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:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by CISA (ADP).
Official description
An access control issue in /usr/sbin/httpd in Tenda TX9 V1 V22.03.02.54, Tenda AX3 V3 V16.03.12.11, Tenda AX9 V1 V22.03.01.46, and Tenda AX12 V1 V22.03.01.46 allows attackers to bypass authentication on any endpoint via a crafted URL.
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.
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
Technical write-ups (may include proof of concept)
- github.com/xiaobye-ctf/My-CVE/tree/main/Tenda/CVE-2023-47422Exploit, Third Party Advisory
Recent Improper Access Control vulnerabilities
- 7.4 High severity
- 8.1 High severity
- 7.7 High severity
- 7.5 High severity
- 8.6 High severity
- 7.8 High severity
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