CyberSecBulletin
CVE-2024-4641NVD status: Analyzed

OnCell G3150A-LTE Series: Use of Externally-Controlled Format String

Published Updated By the CyberSecBulletin desk

CVE-2024-4641 is a critical-severity use of externally-controlled format string vulnerability in OnCell G3150A-LTE Series from Moxa, 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. Affected OnCell G3150A-LTE Series versions: 1.0 through 1.7.7. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.34% chance of exploitation within 30 days, which is low compared with other CVEs.

Patch this week

Critical severity: a successful attack would have severe impact.

What to do

  1. Check which version of OnCell G3150A-LTE Series you run against the affected versions below, and install the vendor's latest release.
  2. Read the advisory on moxa.com for workarounds and exact fixed builds.
  3. 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
MoxaOnCell G3150A-LTE Series1.0 through 1.7.7Not stated
Moxaoncell_g3470a-lte-us1.7.7 and earlierNot stated
MoxaOncell G3470a-lte-us-t Firmware1.7.7 and earlierNot stated
MoxaOncell G3470a-lte-eu Firmware1.7.7 and earlierNot stated
MoxaOncell G3470a-lte-eu-t Firmware1.7.7 and earlierNot stated
MoxaOncell G3470a-lte-us Firmware1.7.7 and earlierNot 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
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 3.16.3MediumCNA (moxa.com)
CVSS 3.19.8CriticalNVD

Official description

OnCell G3470A-LTE Series firmware versions v1.7.7 and prior have been identified as vulnerable due to accepting a format string from an external source as an argument. An attacker could modify an externally controlled format string to cause a memory leak and denial of service.

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

The underlying weakness: Use of Externally-Controlled Format String

The product uses a function that accepts a format string as an argument, but the format string originates from an external source.

How developers prevent this class of flaw

  • Choose a language that is not subject to this flaw.
  • Ensure that all format string functions are passed a static string which cannot be controlled by the user, and that the proper number of arguments are always sent to that function as well. If at all possible, use functions that do not support the %n operator in format strings.
  • Run compilers and linkers with high warning levels, since they may detect incorrect usage.

More Use of Externally-Controlled Format String vulnerabilities (CWE-134)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in OnCell G3150A-LTE Series

All OnCell G3150A-LTE Series vulnerabilities

Recent Use of Externally-Controlled Format String vulnerabilities

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