Security-key disclosure via unrestricted MCUmgr file reads
Published May 24, 2021 · Updated Sep 17, 2024
Information disclosure in Zephyr RTOS 1.14.2 and 2.3.0 allows local users to extract security settings through MCUmgr file management. When the settings subsystem uses LittleFS, it stores secrets such as Bluetooth Mesh device, network, and application keys unencrypted, while MCUmgr file management permits clients to copy files from the device. Exploitation requires the nondefault LittleFS settings and MCUmgr file-management combination plus access to an enabled management transport, and exposes stored secrets without altering or interrupting the device.
Summary
What happened
Information disclosure in Zephyr RTOS 1.14.2 and 2.3.0 allows local users to extract security settings through MCUmgr file management. When the settings subsystem uses LittleFS, it stores secrets such as Bluetooth Mesh device, network, and application keys unencrypted, while MCUmgr file management permits clients to copy files from the device. Exploitation requires the nondefault LittleFS settings and MCUmgr file-management combination plus access to an enabled management transport, and exposes stored secrets without altering or interrupting the device.
The record
- CVE
- CVE-2020-13599
- Published
- May 24, 2021
- Updated
- Sep 17, 2024
- Vendor
- Zephyr Project
- Product
- Zephyr RTOS
- Classifications
- CWE-276, CAPEC-1, T1005
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 24, 2021CVE publishedPublication date reported by the CVE source.
- Sep 17, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=1.14.2 <unspecified
- Affected versionversion=2.3.0 <unspecified
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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