Apple macOS up to 11.5.2 FontParser Remote Code Execution

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.
6.0	$0-$5k	0.00

Summaryinfo

A vulnerability labeled as critical has been found in Apple macOS up to 11.5.2. This issue affects some unknown processing of the component FontParser. Executing a manipulation can lead to an unknown weakness. This vulnerability appears as CVE-2021-30843. The attack may be performed from remote. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical was found in Apple macOS up to 11.5.2 (Operating System). This vulnerability affects an unknown part of the component FontParser. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was presented 09/13/2021 by Xingwei Lin as HT212804 as confirmed advisory (Website). The advisory is shared for download at support.apple.com. This vulnerability was named CVE-2021-30843. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The advisory points out:

Processing a maliciously crafted dfont file may lead to arbitrary code execution

Upgrading to version 11.6 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability. The advisory contains the following remark:

This issue was addressed with improved checks.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Operating System

Vendor

Apple

Name

macOS

Version

License

commercial

Website

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

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Remote Code Execution
CWE: Unknown
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: macOS 11.6

Timelineinfo

04/13/2021 🔍
09/13/2021 +153 days 🔍
09/13/2021 +0 days 🔍
09/21/2021 +8 days 🔍
09/30/2021 +9 days 🔍

Sourcesinfo

Vendor: apple.com

Advisory: HT212804
Researcher: Xingwei Lin
Status: Confirmed

CVE: CVE-2021-30843 (🔍)
GCVE (CVE): GCVE-0-2021-30843
GCVE (VulDB): GCVE-100-183088
scip Labs: https://www.scip.ch/en/?labs.20180712

Entryinfo

Created: 09/21/2021 11:21
Updated: 09/30/2021 13:51
Changes: 09/21/2021 11:21 (18), 09/21/2021 11:24 (28), 09/30/2021 13:51 (1)
Complete: 🔍
Cache ID: 216::103