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CVE-2021-42306— Azure Active Directory Information Disclosure Vulnerability

Quick assessment

Affected
Microsoft Azure Active Directory
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft Windows是美国微软（Microsoft）公司的一种桌面操作系统。 Microsoft Azure Active Directory 存在信息泄露漏洞。目前尚无此漏洞的相关信息，请随时关注CNNVD或厂商公告。

CVSS 8.1 · High EPSS 3.27% · P88

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 4

VendorProduct Version RangeStatus
Microsoft Azure Active Directory - affected
Microsoft Azure Automation 1.0.0< publication affected
Microsoft Azure Migrate - affected
Microsoft Azure Site Recovery - affected
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I. Basic Information for CVE-2021-42306

Vulnerability Information
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Vulnerability Title
Azure Active Directory Information Disclosure Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
An information disclosure vulnerability manifests when a user or an application uploads unprotected private key data as part of an authentication certificate keyCredential  on an Azure AD Application or Service Principal (which is not recommended). This vulnerability allows a user or service in the tenant with application read access to read the private key data that was added to the application. Azure AD addressed this vulnerability by preventing disclosure of any private key values added to the application. Microsoft has identified services that could manifest this vulnerability, and steps that customers should take to be protected. Refer to the FAQ section for more information. For more details on this issue, please refer to the MSRC Blog Entry.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Azure Active Directory 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Windows是美国微软（Microsoft）公司的一种桌面操作系统。 Microsoft Azure Active Directory 存在信息泄露漏洞。目前尚无此漏洞的相关信息，请随时关注CNNVD或厂商公告。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Azure Active Directory - -
Microsoft Azure Automation 1.0.0 ~ publication -
Microsoft Azure Migrate - -
Microsoft Azure Site Recovery - -

II. Public POCs for CVE-2021-42306

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III. Intelligence Information for CVE-2021-42306

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Vendor Advisories for CVE-2021-42306 (2)

Same Patch Batch · Microsoft · 2021-11-24 · 6 CVEs total

CVE-2021-43211 5.5 MEDIUM Windows 10 Update Assistant Elevation of Privilege Vulnerability
CVE-2021-42297 5.0 MEDIUM Windows 10 Update Assistant Elevation of Privilege Vulnerability
CVE-2021-43221 4.2 MEDIUM Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability
CVE-2021-43220 3.1 LOW Microsoft Edge for iOS Spoofing Vulnerability
CVE-2021-42308 3.1 LOW Microsoft Edge (Chromium-based) Spoofing Vulnerability

IV. Related Vulnerabilities

Same product: Azure Active Directory
Same vendor: Microsoft

V. Comments for CVE-2021-42306

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