MELSEC iQ-R Series EtherNet/IP module RJ71EIP91: Unrestricted Upload of File with Dangerous Type
CVE-2023-2063 is a high-severity unrestricted upload of file with dangerous type vulnerability in MELSEC iQ-R Series EtherNet/IP module RJ71EIP91 from Mitsubishi Electric, with a CVSS 3.1 base score of 7.3 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected MELSEC iQ-R Series EtherNet/IP module RJ71EIP91 versions: all versions. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.61% 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 MELSEC iQ-R Series EtherNet/IP module RJ71EIP91 you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on mitsubishielectric.co.jp 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 |
|---|---|---|---|
| Mitsubishi Electric | MELSEC iQ-R Series EtherNet/IP module RJ71EIP91 | all versions | Not stated |
| Mitsubishi Electric | MELSEC iQ-F Series EtherNet/IP module FX5-ENET/IP | all versions | Not stated |
| Mitsubishi Electric | Fx5-enet/ip Firmware | Not specified in the record | Not stated |
| Mitsubishi Electric | Sw1dnn-eipct-bd Firmware | Not specified in the record | Not stated |
| Mitsubishi Electric | Rj71eip91 Firmware | Not specified in the record | Not stated |
| Mitsubishi Electric | Sw1dnn-eipctfx5-bd Firmware | Not specified in the record | 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
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- LowSome restricted data can be read.
- Integrity
- LowLimited modification of data is possible.
- Availability
- LowPerformance or availability is reduced.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 6.3 | Medium | CNA (yd.MitsubishiElectric.co.jp) |
| CVSS 3.1 | 7.3 | High | NVD |
Official description
Unrestricted Upload of File with Dangerous Type vulnerability in FTP function on Mitsubishi Electric Corporation MELSEC iQ-R Series EtherNet/IP module RJ71EIP91 and MELSEC iQ-F Series EtherNet/IP module FX5-ENET/IP allows a remote unauthenticated attacker to cause information disclosure, tampering, deletion or destruction via file upload/download. As a result, the attacker may be able to exploit this for further attacks.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Unrestricted Upload of File with Dangerous Type
The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.
How developers prevent this class of flaw
- Generate a new, unique filename for an uploaded file instead of using the user-supplied filename, so that no external input is used at all.
- When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs.
- Consider storing the uploaded files outside of the web document root entirely. Then, use other mechanisms to deliver the files dynamically.
More Unrestricted Upload of File with Dangerous Type vulnerabilities (CWE-434)
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
Third-party and government advisories
- jvn.jp/vu/JVNVU92908006Third Party Advisory
Other vulnerabilities in MELSEC iQ-R Series EtherNet/IP module RJ71EIP91
- 7.5 High severity
- 7.5 High severity
Recent Unrestricted Upload of File with Dangerous Type vulnerabilities
- 9.8 Critical severity
- 8.8 High severity
- 8.8 High severity
- 8.8 High severity
- 9.8 Critical severity
- 8.8 High severity
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