Trusted-application code execution via unchecked output size
Published Jun 13, 2022 · Updated Aug 4, 2024
Out-of-bounds write in HarmonyOS 2.0 allows local users to execute code in the bone voice ID trusted application via crafted input. DecryptData copies decrypted bytes into the TEE output buffer using the decrypted size without checking the output buffer’s actual capacity. The trusted application accepts calls only from a whitelisted native service; the public demonstration required root access and a patched kernel to impersonate that service.
Summary
What happened
Out-of-bounds write in HarmonyOS 2.0 allows local users to execute code in the bone voice ID trusted application via crafted input. DecryptData copies decrypted bytes into the TEE output buffer using the decrypted size without checking the output buffer’s actual capacity. The trusted application accepts calls only from a whitelisted native service; the public demonstration required root access and a patched kernel to impersonate that service.
The record
- CVE
- CVE-2021-40036
- Published
- Jun 13, 2022
- Updated
- Aug 4, 2024
- Vendor
- Huawei Technologies Co., Ltd.
- Product
- HarmonyOS
- Classifications
- CWE-787, T1068
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Jun 13, 2022CVE publishedPublication date reported by the CVE source.
- Aug 4, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=HarmonyOS 2.0
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- TEE_SERVICE_VOICE_REC control-flow hijack demonstrationfunctional · demonstrated
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Technologies
Your stack
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Your stack
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