Fxa3000 Firmware: Direct Request
CVE-2022-36158 is a high-severity direct request vulnerability in Fxa3000 Firmware from Contec, with a CVSS 3.1 base score of 8.0 out of 10. It can be exploited from the same local network by an attacker with a low-privileged account, without any action from a user. Affected Fxa3000 Firmware versions: 1.13.00 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 1.57% chance of exploitation within 30 days, higher than 76% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Fxa2000 Firmware to 1.39.00 or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Contec | Fxa3000 Firmware | 1.13.00 and earlier | Not stated |
| Contec | Fxa3020 Firmware | 1.13.00 and earlier | Not stated |
| Contec | Fxa3200 Firmware | 1.13.00 and earlier | Not stated |
| Contec | Fxa2000 Firmware | before 1.39.00 | 1.39.00 |
Version data comes from NVD's product matching. 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
- 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:A/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 | NVD |
| CVSS 3.1 | 8.8 | High | CISA (ADP) |
Official description
Contec FXA3200 version 1.13.00 and under suffers from Insecure Permissions in the Wireless LAN Manager interface which allows malicious actors to execute Linux commands with root privilege via a hidden web page (/usr/www/ja/mnt_cmd.cgi).
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Direct Request
The web application does not adequately enforce appropriate authorization on all restricted URLs, scripts, or files.
How developers prevent this class of flaw
- Apply appropriate access control authorizations for each access to all restricted URLs, scripts or files.
- Consider using MVC based frameworks such as Struts.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: poc, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
- jvn.jp/en/vu/JVNVU98305100/Third Party Advisory
- samy.link/blog/contec-flexlan-fxa2000-and-fxa3000-series-vulnerability-repoExploit, Mitigation, Third Party Advisory
Other references
Other vulnerabilities in Fxa3000 Firmware
- 8.8 High severity
Recent Direct Request vulnerabilities
- 7.5 High severity
- 7.5 High severity
- 8.0 High severity
- 7.5 High severity
- 8.8 High severity
- 7.5 High severity
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