CyberSecBulletin
CVE-2022-25163NVD status: Modified

Improper Input Validation vulnerability in Mitsubishi Electric MELSEC-Q Series QJ71E71-100…

Published Updated By the CyberSecBulletin desk

CVE-2022-25163 is a critical-severity improper input validation vulnerability in Mitsubishi Electric MELSEC-Q Series QJ71E71-100; Mitsubishi Electric MELSEC-L series LJ71E71-100; Mitsubishi Electric MELSEC iQ-R Series RD81MES96N, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. There is no confirmed exploitation so far. EPSS estimates a 2.31% chance of exploitation within 30 days, higher than 84% of scored CVEs.

Patch this week

Critical severity: a successful attack would have severe impact.

What to do

  1. Update Melsec Iq-r Rd81mes96n Firmware to 09 or a later version.
  2. Update Melsec Qj71e71-100 Firmware to 24062 or a later version.
  3. Update Melsec Lj71e71-100 Firmware to 24062 or a later version.
  4. Read the advisory on mitsubishielectric.com for workarounds and exact fixed builds.
  5. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
Mitsubishi Electric MELSEC-Q Series QJ71E71-100; Mitsubishi Electric MELSEC-L series LJ71E71-100; Mitsubishi Electric MELSEC iQ-R Series RD81MES96NMitsubishi Electric MELSEC-Q Series QJ71E71-100; Mitsubishi Electric MELSEC-L series LJ71E71-100; Mitsubishi Electric MELSEC iQ-R Series RD81MES96NNot specified in the recordNot stated
MitsubishiMelsec Iq-r Rd81mes96n Firmwarebefore 0909
MitsubishiMelsec Qj71e71-100 Firmwarebefore 2406224062
MitsubishiMelsec Lj71e71-100 Firmwarebefore 2406224062

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
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:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.19.8CriticalNVD
CVSS 2.010.0HighNVD

Official description

Improper Input Validation vulnerability in Mitsubishi Electric MELSEC-Q Series QJ71E71-100 first 5 digits of serial number "24061" or prior, Mitsubishi Electric MELSEC-L series LJ71E71-100 first 5 digits of serial number "24061" or prior and Mitsubishi Electric MELSEC iQ-R Series RD81MES96N firmware version "08" or prior allows a remote unauthenticated attacker to cause a denial of service (DoS) condition or execute malicious code on the target products by sending specially crafted packets.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

How developers prevent this class of flaw

  • Consider using language-theoretic security (LangSec) techniques that characterize inputs using a formal language and build recognizers for that language. This effectively requires parsing to be a distinct layer that effectively enforces a boundary between raw input and internal data representations, instead of allowing parser code to be scattered throughout the program, where it could be subject to errors or inconsistencies that create weaknesses.
  • Use an input validation framework such as Struts or the OWASP ESAPI Validation API. Note that using a framework does not automatically address all input validation problems; be mindful of weaknesses that could arise from misusing the framework itself (CWE-1173).
  • Understand all the potential areas where untrusted inputs can enter the product, including but not limited to: parameters or arguments, cookies, anything read from the network, environment variables, reverse DNS lookups, query results, request headers, URL components, e-mail, files, filenames, databases, and any external systems that provide data to the application. Remember that such inputs may be obtained indirectly through API calls.

More Improper Input Validation vulnerabilities (CWE-20)

Timeline

  1. CVE record published.
  2. Record last changed materially (score, affected products, status or references).

References

Third-party and government advisories

Recent Improper Input Validation vulnerabilities

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