Apple tvOS up to 14.7 Kernel race condition

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.
6.7	$0-$5k	0.00

Summaryinfo

A vulnerability described as critical has been identified in Apple tvOS up to 14.7. The impacted element is an unknown function of the component Kernel. Such manipulation leads to race condition. This vulnerability is documented as CVE-2021-30857. The attack needs to be performed locally. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Apple tvOS up to 14.7 (Digital Media Player) and classified as critical. Affected by this issue is an unknown code block of the component Kernel. The manipulation with an unknown input leads to a race condition vulnerability. Using CWE to declare the problem leads to CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. Impacted is confidentiality, integrity, and availability.

The weakness was released 09/20/2021 by Zweig as HT212815 as confirmed advisory (Website). The advisory is available at support.apple.com. This vulnerability is handled as CVE-2021-30857. The technical details are unknown and an exploit is not available. The advisory points out:

A malicious application may be able to execute arbitrary code with kernel privileges

Upgrading to version 15.0 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability. The advisory contains the following remark:

A race condition was addressed with improved locking.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Digital Media Player

Vendor

Apple

Name

tvOS

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: 7.0
VulDB Meta Temp Score: 6.7

VulDB Base Score: 7.0
VulDB Temp Score: 6.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

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: tvOS 15.0

Timelineinfo

04/13/2021 🔍
09/20/2021 +160 days 🔍
09/20/2021 +0 days 🔍
09/21/2021 +1 days 🔍
09/30/2021 +9 days 🔍

Sourcesinfo

Vendor: apple.com

Advisory: HT212815
Researcher: Zweig
Status: Confirmed

CVE: CVE-2021-30857 (🔍)
GCVE (CVE): GCVE-0-2021-30857
GCVE (VulDB): GCVE-100-183146

Entryinfo

Created: 09/21/2021 12:36
Updated: 09/30/2021 19:33
Changes: 09/21/2021 12:36 (17), 09/21/2021 12:37 (2), 09/21/2021 12:40 (27), 09/30/2021 19:33 (1)
Complete: 🔍
Cache ID: 216::103