Mitsubishi Electric MELSEC iQ-R Series…: Improper Locking
CVE-2022-24946 is a high-severity improper locking vulnerability in Mitsubishi Electric MELSEC iQ-R Series R12CCPU-V; Mitsubishi Electric MELSEC-Q Series Q03UDECPU; Mitsubishi Electric MELSEC-Q Series Q04/06/10/13/20/26/50/100UDEHCPU; Mitsubishi Electric MELSEC-Q Series Q03/04/06/13/26UDVCPU; Mitsubishi Electric MELSEC-Q Series Q04/06/13/26UDPVCPU; Mitsubishi Electric MELSEC-Q Series Q12DCCPU-V; Mitsubishi Electric MELSEC-Q Series Q24DHCCPU-V(G); Mitsubishi Electric MELSEC-Q Series Q24/26DHCCPU-LS; Mitsubishi Electric MELSEC-L series L02/06/26CPU(-P); Mitsubishi Electric MELSEC-L series L26CPU-(P)BT; Mitsubishi Electric MELIPC Series MI5122-VW, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected Mitsubishi Electric MELSEC iQ-R Series R12CCPU-V; Mitsubishi Electric MELSEC-Q Series Q03UDECPU; Mitsubishi Electric MELSEC-Q Series Q04/06/10/13/20/26/50/100UDEHCPU; Mitsubishi Electric MELSEC-Q Series Q03/04/06/13/26UDVCPU; Mitsubishi Electric MELSEC-Q Series Q04/06/13/26UDPVCPU; Mitsubishi Electric MELSEC-Q Series Q12DCCPU-V; Mitsubishi Electric MELSEC-Q Series Q24DHCCPU-V(G); Mitsubishi Electric MELSEC-Q Series Q24/26DHCCPU-LS; Mitsubishi Electric MELSEC-L series L02/06/26CPU(-P); Mitsubishi Electric MELSEC-L series L26CPU-(P)BT; Mitsubishi Electric MELIPC Series MI5122-VW versions: Mitsubishi Electric MELSEC-Q Series Q12DCCPU-V 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 1.75% chance of exploitation within 30 days, higher than 78% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of Mitsubishi Electric MELSEC iQ-R Series R12CCPU-V; Mitsubishi Electric MELSEC-Q Series Q03UDECPU; Mitsubishi Electric MELSEC-Q Series Q04/06/10/13/20/26/50/100UDEHCPU; Mitsubishi Electric MELSEC-Q Series Q03/04/06/13/26UDVCPU; Mitsubishi Electric MELSEC-Q Series Q04/06/13/26UDPVCPU; Mitsubishi Electric MELSEC-Q Series Q12DCCPU-V; Mitsubishi Electric MELSEC-Q Series Q24DHCCPU-V(G); Mitsubishi Electric MELSEC-Q Series Q24/26DHCCPU-LS; Mitsubishi Electric MELSEC-L series L02/06/26CPU(-P); Mitsubishi Electric MELSEC-L series L26CPU-(P)BT; Mitsubishi Electric MELIPC Series MI5122-VW you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on mitsubishielectric.com 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
Version data comes from the organisation that assigned the CVE; 8 further products are omitted here. 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
- NoneNo data is disclosed.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.5 | High | NVD |
| CVSS 3.1 | 7.5 | High | CISA (ADP) |
| CVSS 2.0 | 7.8 | High | NVD |
Official description
Improper Resource Locking vulnerability in Mitsubishi Electric MELSEC iQ-R Series R12CCPU-V firmware versions "16" and prior, Mitsubishi Electric MELSEC-Q Series Q03UDECPU the first 5 digits of serial No. "24061" and prior, Mitsubishi Electric MELSEC-Q Series Q04/06/10/13/20/26/50/100UDEHCPU the first 5 digits of serial No. "24061" and prior, Mitsubishi Electric MELSEC-Q Series Q03/04/06/13/26UDVCPU the first 5 digits of serial number "24051" and prior, Mitsubishi Electric MELSEC-Q Series Q04/06/13/26UDPVCPU the first 5 digits of serial number "24051" and prior, Mitsubishi Electric MELSEC-Q Series Q12DCCPU-V all versions, Mitsubishi Electric MELSEC-Q Series Q24DHCCPU-V(G) all versions, Mitsubishi Electric MELSEC-Q Series Q24/26DHCCPU-LS all versions, Mitsubishi Electric MELSEC-L series L02/06/26CPU(-P) the first 5 digits of serial number "24051" and prior, Mitsubishi Electric MELSEC-L series L26CPU-(P)BT the first 5 digits of serial number "24051" and prior and Mitsubishi Electric MELIPC Series MI5122-VW firmware versions "05" and prior allows a remote unauthenticated attacker to cause a denial of service (DoS) condition in Ethernet communications by sending specially crafted packets. A system reset of the products is required for recovery.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Locking
The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors.
How developers prevent this class of flaw
- Use industry standard APIs to implement locking mechanism.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Third-party and government advisories
- jvn.jp/vu/JVNVU90895626/index.htmlThird Party Advisory
Other references
Recent Improper Locking vulnerabilities
- 7.5 High severity
- 7.0 High severity
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