Apple iOS/iPadOS up to 14.7 IOMobileFrameBuffer memory corruption

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CVSS Meta Temp Score
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7.5$0-$5k0.53

A vulnerability was found in Apple iOS and iPadOS up to 14.7 (Smartphone Operating System). It has been declared as critical. This vulnerability affects an unknown code block of the component IOMobileFrameBuffer. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was shared 07/26/2021 as HT212623 as confirmed advisory (Website). The advisory is available at support.apple.com. This vulnerability was named CVE-2021-30807 since 04/13/2021. The exploitation appears to be easy. Local access is required to approach this attack. The requirement for exploitation is a single authentication. Technical details are unknown but a public exploit is available. The advisory points out:

An application may be able to execute arbitrary code with kernel privileges. Apple is aware of a report that this issue may have been actively exploited.

A public exploit has been developed by Saar Amar in Objective-C and been published immediately after the advisory. It is declared as highly functional. It is possible to download the exploit at saaramar.github.io. As 0-day the estimated underground price was around $25k-$100k.

Upgrading to version 14.7.1 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability. The advisory contains the following remark:

A memory corruption issue was addressed with improved memory handling.

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VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.5

VulDB Base Score: 7.8
VulDB Temp Score: 7.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfoedit

Class: Memory corruption
CWE: CWE-119
ATT&CK: Unknown

Local: Yes
Remote: No

Availability: 🔒
Access: Public
Status: Highly functional
Author: Saar Amar
Programming Language: 🔒
Download: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Interest: 🔍
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Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔒
0-Day Time: 🔒
Exposure Time: 🔒
Exploit Delay Time: 🔍

Upgrade: iOS/iPadOS 14.7.1

Timelineinfoedit

04/13/2021 CVE assigned
07/26/2021 +104 days Advisory disclosed
07/26/2021 +0 days Exploit disclosed
07/26/2021 +0 days Countermeasure disclosed
07/27/2021 +1 days VulDB entry created
08/05/2021 +9 days VulDB last update

Sourcesinfoedit

Vendor: https://www.apple.com/

Advisory: HT212623
Status: Confirmed

CVE: CVE-2021-30807 (🔒)
scip Labs: https://www.scip.ch/en/?labs.20150917

Entryinfoedit

Created: 07/27/2021 07:52 AM
Updated: 08/05/2021 09:09 AM
Changes: (1) source_cve_assigned
Complete: 🔍
Committer: misc

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