Local privilege escalation via parcel mismatch
Published Dec 15, 2021 · Updated Aug 3, 2024
Android 11 contains a parcel serialization and deserialization mismatch in ParsingPackageImpl that allows local users to gain elevated privileges. ParsingPackageImpl validates parcel input inconsistently between writing and reading, so crafted package data can be interpreted with mismatched structure. Exploitation requires local code execution but no additional privileges or user interaction, and can affect confidentiality, integrity, and availability.
Summary
What happened
Android 11 contains a parcel serialization and deserialization mismatch in ParsingPackageImpl that allows local users to gain elevated privileges. ParsingPackageImpl validates parcel input inconsistently between writing and reading, so crafted package data can be interpreted with mismatched structure. Exploitation requires local code execution but no additional privileges or user interaction, and can affect confidentiality, integrity, and availability.
The record
- CVE
- CVE-2021-0921
- Published
- Dec 15, 2021
- Updated
- Aug 3, 2024
- Vendor
- Google Cloud
- Product
- Android
- Classifications
- CWE-20, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Dec 15, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 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-11
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.
Weakness, pattern, technique
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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