Information disclosure via unchecked slice counter increment
Published Oct 6, 2021 · Updated Aug 3, 2024
Heap buffer overflow in Android Media Codecs 8.1 through 11 allows remote attackers to disclose information through crafted H.264 media. The libavc decoder increments u2_cur_slice_num even when the current slice has no macroblock memory left, allowing ih264d_mark_err_slice_skip to write past heap bounds. Exploitation requires a user to process attacker-controlled media; no execution privileges are needed, and the documented consequence is information disclosure.
Summary
What happened
Heap buffer overflow in Android Media Codecs 8.1 through 11 allows remote attackers to disclose information through crafted H.264 media. The libavc decoder increments u2_cur_slice_num even when the current slice has no macroblock memory left, allowing ih264d_mark_err_slice_skip to write past heap bounds. Exploitation requires a user to process attacker-controlled media; no execution privileges are needed, and the documented consequence is information disclosure.
The record
- CVE
- CVE-2021-0690
- Published
- Oct 6, 2021
- Updated
- Aug 3, 2024
- Vendor
- Google Cloud
- Product
- Android
- Classifications
- CWE-787, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 6, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=Android-9 Android-10 Android-11 Android-8.1
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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