Xen up to 4.13 Grant Table access control

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 (≈)
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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.
5.7$0-$5k0.00

Summaryinfo

A vulnerability was found in Xen up to 4.13 and classified as critical. Affected is an unknown function of the component Grant Table Handler. Such manipulation leads to access control. This vulnerability is traded as CVE-2021-28703. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Xen up to 4.13 (Virtualization Software). It has been rated as critical. Affected by this issue is an unknown code of the component Grant Table Handler. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is confidentiality, integrity, and availability.

The weakness was shared 12/07/2021. The advisory is shared for download at xenbits.xenproject.org. This vulnerability is handled as CVE-2021-28703 since 03/18/2021. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1068.

Upgrading to version 4.14 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.8
VulDB Meta Temp Score: 5.7

VulDB Base Score: 4.6
VulDB Temp Score: 4.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.0
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Xen 4.14

Timelineinfo

03/18/2021 🔍
12/07/2021 +264 days 🔍
12/07/2021 +0 days 🔍
10/03/2022 +300 days 🔍

Sourcesinfo

Advisory: xenbits.xenproject.org
Status: Confirmed

CVE: CVE-2021-28703 (🔍)
GCVE (CVE): GCVE-0-2021-28703
GCVE (VulDB): GCVE-100-187604

Entryinfo

Created: 12/07/2021 14:52
Updated: 10/03/2022 09:47
Changes: 12/07/2021 14:52 (39), 12/09/2021 22:33 (1), 10/03/2022 09:47 (18)
Complete: 🔍
Cache ID: 216::103

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