CyberSecBulletin
CVE-2023-36622NVD status: Modified

miniserver_go_gen_2: Improper Neutralization of Special Elements used in an OS Command

Published Updated By the CyberSecBulletin desk

CVE-2023-36622 is a high-severity improper neutralization of special elements used in an OS command vulnerability in miniserver_go_gen_2 from Loxone, with a CVSS 3.1 base score of 7.2 out of 10. It can be exploited remotely over the network by an attacker with administrator privileges, without any action from a user. The record lists version 14.1.5.9 as the first without the flaw, so updating miniserver_go_gen_2 to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 1.37% chance of exploitation within 30 days, higher than 72% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update miniserver_go_gen_2 to 14.1.5.9 or a later version.
  2. Update Miniserver Go Gen 2 Firmware to 14.1.5.9 or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
Loxoneminiserver_go_gen_2before 14.1.5.914.1.5.9
LoxoneMiniserver Go Gen 2 Firmwarebefore 14.1.5.914.1.5.9

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
HighAdministrator-level access is required first.
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:H/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.

Official description

The websocket configuration endpoint of the Loxone Miniserver Go Gen.2 before 14.1.5.9 allows remote authenticated administrators to inject arbitrary OS commands via the timezone parameter.

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

The underlying weakness: Improper Neutralization of Special Elements used in an OS Command

The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command before it is sent to a downstream component.

How developers prevent this class of flaw

  • If at all possible, use library calls rather than external processes to recreate the desired functionality.
  • For any data that will be used to generate a command to be executed, keep as much of that data out of external control as possible. For example, in web applications, this may require storing the data locally in the session's state instead of sending it out to the client in a hidden form field.
  • For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.

More Improper Neutralization of Special Elements used in an OS Command vulnerabilities (CWE-78)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: poc, automatable: no, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Technical write-ups (may include proof of concept)

Other vulnerabilities in miniserver_go_gen_2

All miniserver_go_gen_2 vulnerabilities

Recent Improper Neutralization of Special Elements used in an OS Command vulnerabilities

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