+F FS040U, +F FS020W, +F FS030W, and +F FS040W: Cross-Site Request Forgery
CVE-2022-43470 is a high-severity cross-site request forgery vulnerability in +F FS040U, +F FS020W, +F FS030W, and +F FS040W from FUJI SOFT, with a CVSS 3.1 base score of 7.3 out of 10. It can be exploited from the same local network by an unauthenticated attacker, but only if a user takes part, for example by opening a link or file. There is no confirmed exploitation so far. EPSS estimates a 0.24% 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 +F FS040U, +F FS020W, +F FS030W, and +F FS040W you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on fsi.co.jp for workarounds and exact fixed builds.
- Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| FUJI SOFT | +F FS040U, +F FS020W, +F FS030W, and +F FS040W | Not specified in the record | Not stated |
| Fsi | Fs040u Firmware | 2.3.4 and earlier | Not stated |
| Fsi | Fs020w Firmware | 4.0.0 and earlier | Not stated |
| Fsi | Fs030w Firmware | 3.3.5 and earlier | Not stated |
| Fsi | Fs040w Firmware | 1.4.1 and earlier | 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
- RequiredA user must take an action such as opening a file or link.
- 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:A/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.3 | High | NVD |
| CVSS 3.1 | 7.3 | High | CISA (ADP) |
Official description
Cross-site request forgery (CSRF) vulnerability in +F FS040U software versions v2.3.4 and earlier, +F FS020W software versions v4.0.0 and earlier, +F FS030W software versions v3.3.5 and earlier, and +F FS040W software versions v1.4.1 and earlier allows an adjacent attacker to hijack the authentication of an administrator and user's unintended operations such as to reboot the product and/or reset the configuration to the initial set-up may be performed.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Cross-Site Request Forgery
The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.
How developers prevent this class of flaw
- Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. For example, use anti-CSRF packages such as the OWASP CSRFGuard. Another example is the ESAPI Session Management control, which includes a component for CSRF.
- Ensure that the application is free of cross-site scripting issues (CWE-79), because most CSRF defenses can be bypassed using attacker-controlled script.
- Generate a unique nonce for each form, place the nonce into the form, and verify the nonce upon receipt of the form. Be sure that the nonce is not predictable (CWE-330).
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
Advisories
Third-party and government advisories
- jvn.jp/en/jp/JVN74285622/index.htmlThird Party Advisory
Recent Cross-Site Request Forgery vulnerabilities
- 8.8 High severity
- 8.8 High severity
- 8.8 High severity
- 7.4 High severity
- 8.8 High severity
- 8.8 High severity
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