Paired-device privilege escalation via wrapped fragment length
Published Sep 11, 2023 · Updated Sep 26, 2024
Out-of-bounds write in Android 11, 12, 12L, and 13 allows attackers with a paired device to escalate privileges via Bluetooth AVDTP. The avdt_msg_asmbl bounds check added the receive offset and fragment length without widening them to size_t, allowing the computed length to wrap before comparison with the buffer capacity. Exploitation requires a paired Bluetooth device but no user interaction or additional execution privileges, and it can corrupt memory beyond the reassembly buffer.
Summary
What happened
Out-of-bounds write in Android 11, 12, 12L, and 13 allows attackers with a paired device to escalate privileges via Bluetooth AVDTP. The avdt_msg_asmbl bounds check added the receive offset and fragment length without widening them to size_t, allowing the computed length to wrap before comparison with the buffer capacity. Exploitation requires a paired Bluetooth device but no user interaction or additional execution privileges, and it can corrupt memory beyond the reassembly buffer.
The record
- CVE
- CVE-2023-35684
- Published
- Sep 11, 2023
- Updated
- Sep 26, 2024
- Vendor
- Product
- Android
- Classifications
- CWE-787, T1404
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 11, 2023CVE publishedPublication date reported by the CVE source.
- Sep 26, 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=11
- Affected versionversion=12
- Affected versionversion=12L
- Affected versionversion=13
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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Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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