Kernel code execution via wrapped buffer-end check
Published May 11, 2020 · Updated Sep 16, 2024
Integer overflow in Zephyr RTOS 1.14.1 and 2.1.0 allows local users to bypass syscall checks and execute code in the kernel. The ARM is_in_region helper computes start plus size minus one without first verifying that the unsigned addition remains in range, so a wrapped end address passes buffer validation. A malicious userspace application must invoke an affected system call from a user thread; successful exploitation can crash the device, disclose data, corrupt memory, or execute kernel code.
Summary
What happened
Integer overflow in Zephyr RTOS 1.14.1 and 2.1.0 allows local users to bypass syscall checks and execute code in the kernel. The ARM is_in_region helper computes start plus size minus one without first verifying that the unsigned addition remains in range, so a wrapped end address passes buffer validation. A malicious userspace application must invoke an affected system call from a user thread; successful exploitation can crash the device, disclose data, corrupt memory, or execute kernel code.
The record
- CVE
- CVE-2020-10067
- Published
- May 11, 2020
- Updated
- Sep 16, 2024
- Vendor
- Zephyr Project
- Product
- Zephyr RTOS
- Classifications
- CWE-190, T1068
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- May 11, 2020CVE publishedPublication date reported by the CVE source.
- Sep 16, 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=1.14.1 <unspecified
- Affected versionversion=2.1.0 <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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