Memory disclosure via unchecked GATT offset
Published Jun 10, 2021 · Updated Sep 16, 2024
Out-of-bounds read in BlueZ before 5.56 allows local users to disclose bluetoothd memory through a crafted GATT Client Features offset. The cli_feat_read_cb function subtracts the unchecked offset from the one-byte cli_feat array size, causing unsigned underflow before indexing and returning bytes beyond the array. Low-privileged local access is required, and the documented consequence is limited to disclosure of adjacent process memory.
Summary
What happened
Out-of-bounds read in BlueZ before 5.56 allows local users to disclose bluetoothd memory through a crafted GATT Client Features offset. The cli_feat_read_cb function subtracts the unchecked offset from the one-byte cli_feat array size, causing unsigned underflow before indexing and returning bytes beyond the array. Low-privileged local access is required, and the documented consequence is limited to disclosure of adjacent process memory.
The record
- CVE
- CVE-2021-3588
- Published
- Jun 10, 2021
- Updated
- Sep 16, 2024
- Vendor
- BlueZ
- Product
- BlueZ
- Classifications
- CWE-788, CWE-125
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 10, 2021CVE 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=unspecified <5.56
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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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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