2021-30807 | Apple iOS/iPadOS IOMobileFrameBuffer memory corruption (HT212623)

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.5	$0-$5k	1.63+

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. 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.

Type

Vendor

Name

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: 🔍
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: 🔒

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍Recommended: Upgrade
Status: 🔍

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

Upgrade: iOS/iPadOS 14.7.1

07/26/2021 Advisory disclosed
07/26/2021 +0 days Exploit disclosed
07/26/2021 +0 days Countermeasure disclosed
07/27/2021 +1 days VulDB entry created
07/27/2021 +0 days VulDB last updateVendor: https://www.apple.com/

Advisory: HT212623
Status: Confirmed

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

Created: 07/27/2021 07:52
Updated: 07/27/2021 08:06
Changes: (1) exploit_developer_name
Complete: 🔍
Committer: misc

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