Local privilege escalation via unchecked mailbox copy
Published Jan 14, 2022 · Updated Aug 4, 2024
Out-of-bounds write in Titan M2's Android kernel allows local users with System privileges to elevate privileges without user interaction. The copy_from_mbox function in sss_ice_util.c copies mailbox data without a bounds check, permitting writes beyond the destination buffer. Exploitation requires existing System execution privileges; Google has not disclosed the resulting control flow or the precise higher privilege attained.
Summary
What happened
Out-of-bounds write in Titan M2's Android kernel allows local users with System privileges to elevate privileges without user interaction. The copy_from_mbox function in sss_ice_util.c copies mailbox data without a bounds check, permitting writes beyond the destination buffer. Exploitation requires existing System execution privileges; Google has not disclosed the resulting control flow or the precise higher privilege attained.
The record
- CVE
- CVE-2021-39683
- Published
- Jan 14, 2022
- Updated
- Aug 4, 2024
- Vendor
- Product
- Titan M2
- Classifications
- CWE-787, T1404
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Jan 14, 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?
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- Affected versionversion=Android kernel
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
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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