Remote information disclosure via unsynchronized mapping list
Published Apr 12, 2022 · Updated Aug 4, 2024
Use-after-free in the Android Media Framework in Android 10 through 12L allows remote attackers to disclose process memory. The C2AllocatorIon.cpp Impl accesses the mMappings list from multiple threads without a mutex, allowing unmap activity to invalidate an entry while another thread reads it. Exploitation requires user interaction with attacker-supplied media and exposes memory contents without granting code execution or data modification.
Summary
What happened
Use-after-free in the Android Media Framework in Android 10 through 12L allows remote attackers to disclose process memory. The C2AllocatorIon.cpp Impl accesses the mMappings list from multiple threads without a mutex, allowing unmap activity to invalidate an entry while another thread reads it. Exploitation requires user interaction with attacker-supplied media and exposes memory contents without granting code execution or data modification.
The record
- CVE
- CVE-2021-39803
- Published
- Apr 12, 2022
- Updated
- Aug 4, 2024
- Vendor
- Google Cloud
- Product
- Android
- Classifications
- CWE-416
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 12, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=Android-10 Android-11 Android-12 Android-12L
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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