Memory corruption via unchecked crypto buffer lengths
Published Oct 26, 2023 · Updated Feb 13, 2025
Buffer overflow in Zephyr before 3.5 allows local users to interrupt service or expose limited data through oversized crypto API buffers. The STM32 driver's copy_reverse_words function relies on assertions to compare source and destination lengths before memcpy copies attacker-influenced data. Exploitation requires low-privileged local code to invoke an affected crypto operation in a build with assertions disabled.
Summary
What happened
Buffer overflow in Zephyr before 3.5 allows local users to interrupt service or expose limited data through oversized crypto API buffers. The STM32 driver's copy_reverse_words function relies on assertions to compare source and destination lengths before memcpy copies attacker-influenced data. Exploitation requires low-privileged local code to invoke an affected crypto operation in a build with assertions disabled.
The record
- CVE
- CVE-2023-5139
- Published
- Oct 26, 2023
- Updated
- Feb 13, 2025
- Vendor
- Zephyr Project
- Product
- Zephyr RTOS
- Classifications
- CWE-120, CAPEC-100
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 26, 2023CVE publishedPublication date reported by the CVE source.
- Feb 13, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=* <3.5
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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