Remote privilege escalation via timing-leaky signature comparison
Published Dec 4, 2023 · Updated Aug 2, 2024
Observable discrepancy in Android 11, 12, 12L, 13, and 14 allows remote authenticated users to gain elevated privileges over Bluetooth. BTM_BleVerifySignature in btm_ble.cc compares signatures with timing-sensitive memcmp, exposing byte differences that permit signature recovery and validation bypass. Exploitation requires Bluetooth access and low privileges but no user interaction; successful abuse raises privileges on the affected device.
Summary
What happened
Observable discrepancy in Android 11, 12, 12L, 13, and 14 allows remote authenticated users to gain elevated privileges over Bluetooth. BTM_BleVerifySignature in btm_ble.cc compares signatures with timing-sensitive memcmp, exposing byte differences that permit signature recovery and validation bypass. Exploitation requires Bluetooth access and low privileges but no user interaction; successful abuse raises privileges on the affected device.
The record
- CVE
- CVE-2023-40090
- Published
- Dec 4, 2023
- Updated
- Aug 2, 2024
- Vendor
- Product
- Android
- Classifications
- CWE-203, T1068
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Dec 4, 2023CVE publishedPublication date reported by the CVE source.
- Aug 2, 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
- Affected versionversion=14
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
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
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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