3.9

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2024-27086

CVE-2024-27086: MSAL.NET applications targeting Xamarin Android and .NET Android (MAUI) susceptible to local denial of service

The MSAL library enabled acquisition of security tokens to call protected APIs. MSAL.NET applications targeting Xamarin Android and .NET Android (e.g., MAUI) using the library from versions 4.48.0 to 4.60.0 are impacted by a low severity vulnerability.
A malicious application running on a customer Android device can cause local denial of service against applications that were built using MSAL.NET for authentication on the same device (i.e., prevent the user of the legitimate application from logging in) due to incorrect activity export configuration. MSAL.NET version 4.60.1 includes the fix. As a workaround, a developer may explicitly mark the MSAL.NET activity non-exported.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2024-27086

CVE-2024-27086:

3.9

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

SSVC / BOD 26-04 ↗

Exploitation NoneAutomatable NoTech Impact Partial

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Package Name	Ecosystem	Vulnerable Versions	First Patched Version
Microsoft.Identity.Client	nuget	>= 4.48.0, < 4.59.1	4.59.1
Microsoft.Identity.Client	nuget	>= 4.60.0, < 4.60.3	4.60.3

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability is an 'incorrect activity export configuration'. The commit patch directly modifies the 'Exported' attribute of the 'AuthenticationAgentActivity' class from 'true' to 'false' in AuthenticationAgentActivity.cs. The 'Exported=true' status (the vulnerable state) meant that this activity could be launched by any application on the device. When an Android Activity is launched, its 'OnCreate' method is a standard entry point. Therefore, AuthenticationAgentActivity.OnCreate is identified as a vulnerable function because it would be invoked when a malicious application exploits the improper export, making it a key runtime indicator. The patch evidence is the line from the commit diff that shows the 'Exported=true' attribute before it was fixed.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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