CVE-2024-27086: Auth Bypass (CVSS 3.9)

Description

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.

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CVSS v3.1 Score

3.9

LOW

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L

Weakness Type (CWE)

CWE-863 Incorrect Authorization

CWE-926 CWE-926

References

Other References

https://github.com/AzureAD/microsoft-authentication-library-for-dotnet/commit/413e319472ccf48c86647f19fa2aa49ff6038488 https://github.com/AzureAD/microsoft-authentication-library-for-dotnet/security/advisories/GHSA-x674-v45j-fwxw https://github.com/AzureAD/microsoft-authentication-library-for-dotnet/commit/413e319472ccf48c86647f19fa2aa49ff6038488 https://github.com/AzureAD/microsoft-authentication-library-for-dotnet/security/advisories/GHSA-x674-v45j-fwxw

Frequently Asked Questions

What is CVE-2024-27086? +

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. It has a CVSS v3.1 base score of 3.9 (LOW).

How severe is CVE-2024-27086? +

CVE-2024-27086 has a CVSS v3.1 score of 3.9 out of 10, rated LOW. This is a low-severity vulnerability with limited impact.

How do I check if I'm vulnerable to CVE-2024-27086? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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