CVE-2024-47943

Improper signature verification of firmware upgrade files

Published Oct 15, 2024 CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Description
The firmware upgrade function in the admin web interface of the Rittal IoT Interface & CMC III Processing Unit devices checks if
the patch files are signed before executing the containing run.sh
script. The signing process is kind of an HMAC with a long string as key
which is hard-coded in the firmware and is freely available for
download. This allows crafting malicious "signed" .patch files in order
to compromise the device and execute arbitrary code.

Remediation

Vendor Solution

The vendor provides a patched version V6.21.00.2 which can be downloaded from the following URL:  www.rittal.com/de-de/products/deep/3124300 https://www.rittal.com/de-de/products/deep/3124300

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2024-42735 The firmware upgrade function in the admin web interface of the Rittal IoT Interface & CMC III Processing Unit devices checks if the patch files are signed before executing the containing run.sh script. The signing process is kind of an HMAC with a long string as key which is hard-coded in the firmware and is freely available for download. This allows crafting malicious "signed" .patch files in order to compromise the device and execute arbitrary code.
History
Type Values Removed Values Added
Metrics epss

{'score': 0.00183}

epss

{'score': 0.00204}

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description The firmware upgrade function in the admin web interface of the Rittal IoT Interface & CMC III Processing Unit devices checks if the patch files are signed before executing the containing run.sh script. The signing process is kind of an HMAC with a long string as key which is hard-coded in the firmware and is freely available for download. This allows crafting malicious "signed" .patch files in order to compromise the device and execute arbitrary code.
Title Improper signature verification of firmware upgrade files
Weaknesses CWE-347
References

Subscriptions

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Weaknesses

Sources

Status
PUBLISHED
Assigner
SEC-VLab
Published
Updated
Nov 3, 2025, 10:21 PM
Reserved
Oct 7, 2024, 1:39 PM
Status
Deferred
Published
Oct 15, 2024, 9:15 AM
Modified
Jun 17, 2026, 7:58 AM