CyberSecBulletin
CVE-2022-31766NVD status: Analyzed

A vulnerability has been identified in RUGGEDCOM RM1224 LTE(4G) EU (6GK6108-4AM00-2BA2) (All…

Published Updated By the CyberSecBulletin desk

CVE-2022-31766 is a high-severity improper input validation vulnerability in RUGGEDCOM RM1224 LTE(4G) EU from Siemens, with a CVSS 3.1 base score of 8.6 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version V7.1.2 as the first without the flaw, so updating RUGGEDCOM RM1224 LTE(4G) EU to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 1.24% chance of exploitation within 30 days, higher than 70% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update RUGGEDCOM RM1224 LTE(4G) EU to V7.1.2 or a later version.
  2. Update RUGGEDCOM RM1224 LTE(4G) NAM to V7.1.2 or a later version.
  3. Update SCALANCE M804PB to V7.1.2 or a later version.
  4. Read the advisory on cert-portal.siemens.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
SiemensRUGGEDCOM RM1224 LTE(4G) EUbefore V7.1.2V7.1.2
SiemensRUGGEDCOM RM1224 LTE(4G) NAMbefore V7.1.2V7.1.2
SiemensSCALANCE M804PBbefore V7.1.2V7.1.2
SiemensSCALANCE M812-1 ADSL-Routerbefore V7.1.2V7.1.2
SiemensSCALANCE M816-1 ADSL-Routerbefore V7.1.2V7.1.2
SiemensSCALANCE M826-2 SHDSL-Routerbefore V7.1.2V7.1.2
SiemensSCALANCE M874-2before V7.1.2V7.1.2
SiemensSCALANCE M874-3before V7.1.2V7.1.2
SiemensSCALANCE M876-3before V7.1.2V7.1.2
SiemensSCALANCE M876-3 (ROK)before V7.1.2V7.1.2
SiemensSCALANCE M876-4before V7.1.2V7.1.2
SiemensSCALANCE M876-4 (EU)before V7.1.2V7.1.2
SiemensSCALANCE M876-4 (NAM)before V7.1.2V7.1.2
SiemensSCALANCE MUM853-1 (EU)before V7.1.2V7.1.2
SiemensSCALANCE MUM856-1 (EU)before V7.1.2V7.1.2
SiemensSCALANCE MUM856-1 (RoW)before V7.1.2V7.1.2
SiemensSCALANCE S615 EEC LAN-Routerbefore V7.1.2V7.1.2
SiemensSCALANCE S615 LAN-Routerbefore V7.1.2V7.1.2
SiemensSCALANCE WAM763-1V1.1.0 up to, but not including, V3.0.0V3.0.0
SiemensSCALANCE WAM766-1V1.1.0 up to, but not including, V3.0.0V3.0.0
SiemensSCALANCE WAM766-1 (US)V1.1.0 up to, but not including, V3.0.0V3.0.0
SiemensSCALANCE WAM766-1 EECV1.1.0 up to, but not including, V3.0.0V3.0.0
SiemensSCALANCE WAM766-1 EEC (US)V1.1.0 up to, but not including, V3.0.0V3.0.0
SiemensSCALANCE WUM763-1V1.1.0 up to, but not including, V3.0.0V3.0.0
SiemensSCALANCE WUM766-1V1.1.0 up to, but not including, V3.0.0V3.0.0

Version data comes from the organisation that assigned the CVE; 17 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
ChangedThe attack can reach beyond the vulnerable component into other systems.
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:C/C:N/I:N/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.18.6HighCNA (siemens.com)
CVSS 3.18.6HighNVD

Official description

A vulnerability has been identified in RUGGEDCOM RM1224 LTE(4G) EU (6GK6108-4AM00-2BA2) (All versions < V7.1.2), RUGGEDCOM RM1224 LTE(4G) NAM (6GK6108-4AM00-2DA2) (All versions < V7.1.2), SCALANCE M804PB (6GK5804-0AP00-2AA2) (All versions < V7.1.2), SCALANCE M812-1 ADSL-Router (6GK5812-1AA00-2AA2) (All versions < V7.1.2), SCALANCE M812-1 ADSL-Router (6GK5812-1BA00-2AA2) (All versions < V7.1.2), SCALANCE M816-1 ADSL-Router (6GK5816-1AA00-2AA2) (All versions < V7.1.2), SCALANCE M816-1 ADSL-Router (6GK5816-1BA00-2AA2) (All versions < V7.1.2), SCALANCE M826-2 SHDSL-Router (6GK5826-2AB00-2AB2) (All versions < V7.1.2), SCALANCE M874-2 (6GK5874-2AA00-2AA2) (All versions < V7.1.2), SCALANCE M874-3 (6GK5874-3AA00-2AA2) (All versions < V7.1.2), SCALANCE M876-3 (6GK5876-3AA02-2BA2) (All versions < V7.1.2), SCALANCE M876-3 (ROK) (6GK5876-3AA02-2EA2) (All versions < V7.1.2), SCALANCE M876-4 (6GK5876-4AA10-2BA2) (All versions < V7.1.2), SCALANCE M876-4 (EU) (6GK5876-4AA00-2BA2) (All versions < V7.1.2), SCALANCE M876-4 (NAM) (6GK5876-4AA00-2DA2) (All versions < V7.1.2), SCALANCE MUM853-1 (EU) (6GK5853-2EA00-2DA1) (All versions < V7.1.2), SCALANCE MUM856-1 (EU) (6GK5856-2EA00-3DA1) (All versions < V7.1.2), SCALANCE MUM856-1 (RoW) (6GK5856-2EA00-3AA1) (All versions < V7.1.2), SCALANCE S615 EEC LAN-Router (6GK5615-0AA01-2AA2) (All versions < V7.1.2), SCALANCE S615 LAN-Router (6GK5615-0AA00-2AA2) (All versions < V7.1.2), SCALANCE WAM763-1 (6GK5763-1AL00-7DA0) (All versions >= V1.1.0 < V3.0.0), SCALANCE WAM766-1 (6GK5766-1GE00-7DA0) (All versions >= V1.1.0 < V3.0.0), SCALANCE WAM766-1 (US) (6GK5766-1GE00-7DB0) (All versions >= V1.1.0 < V3.0.0), SCALANCE WAM766-1 EEC (6GK5766-1GE00-7TA0) (All versions >= V1.1.0 < V3.0.0), SCALANCE WAM766-1 EEC (US) (6GK5766-1GE00-7TB0) (All versions >= V1.1.0 < V3.0.0), SCALANCE WUM763-1 (6GK5763-1AL00-3AA0) (All versions >= V1.1.0 < V3.0.0), SCALANCE WUM763-1 (6GK5763-1AL00-3DA0) (All versions >= V1.1.0 < V3.0.0), SCALANCE WUM766-1 (6GK5766-1GE00-3DA0) (All versions >= V1.1.0 < V3.0.0), SCALANCE WUM766-1 (USA) (6GK5766-1GE00-3DB0) (All versions >= V1.1.0 < V3.0.0). Affected devices with TCP Event service enabled do not properly handle malformed packets. This could allow an unauthenticated remote attacker to cause a denial of service condition and reboot the device thus possibly affecting other network resources.

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. CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in RUGGEDCOM RM1224 LTE(4G) EU

All RUGGEDCOM RM1224 LTE(4G) EU vulnerabilities

Recent Improper Input Validation vulnerabilities

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