Kernel layout disclosure via returned object pointer
Published Sep 8, 2021 · Updated Aug 3, 2024
Information disclosure in Apple iOS and iPadOS before 14.5 allows local users to determine kernel memory layout via a malicious application. AGXDeviceUserClient::performanceCounterSamplerControl writes a kernel object pointer into its input buffer, then copies that buffer to userspace. A sandboxed application can reach the IOGPU user client, and the disclosed pointer reveals the kernel slide for further exploitation.
Summary
What happened
Information disclosure in Apple iOS and iPadOS before 14.5 allows local users to determine kernel memory layout via a malicious application. AGXDeviceUserClient::performanceCounterSamplerControl writes a kernel object pointer into its input buffer, then copies that buffer to userspace. A sandboxed application can reach the IOGPU user client, and the disclosed pointer reveals the kernel slide for further exploitation.
The record
- CVE
- CVE-2021-30656
- Published
- Sep 8, 2021
- Updated
- Aug 3, 2024
- Vendor
- Apple
- Product
- iOS and iPadOS
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 8, 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=unspecified <14.5
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
No sourced classifications are available.
Public exploit references
- Proof of concept for iOS 13.6.1proof of concept · demonstrated
- Proof of concept for iOS 14.0 through 14.4.2proof 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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