Restricted-memory disclosure via AudioArray allocation race
Published Apr 1, 2020 · Updated Aug 4, 2024
A race condition in WebKit in affected Apple products allows attackers to read restricted memory through crafted web content. AudioArray::allocate shares a static padding value across threads, allowing one thread to change allocation sizing after another thread allocates and before it validates alignment, which permits out-of-bounds access. Exploitation requires WebKit to execute crafted JavaScript and win the allocation race; the demonstrated consequence is disclosure of process memory.
Summary
What happened
A race condition in WebKit in affected Apple products allows attackers to read restricted memory through crafted web content. AudioArray::allocate shares a static padding value across threads, allowing one thread to change allocation sizing after another thread allocates and before it validates alignment, which permits out-of-bounds access. Exploitation requires WebKit to execute crafted JavaScript and win the allocation race; the demonstrated consequence is disclosure of process memory.
The record
- CVE
- CVE-2020-3894
- Published
- Apr 1, 2020
- Updated
- Aug 4, 2024
- Vendor
- Apple
- Product
- iOS
- Classifications
- CWE-362, T1189
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 1, 2020CVE 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=unspecified <iOS 13.4 and iPadOS 13.4
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
- WebKit AudioArray::allocate data-race reproduction caseproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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