ASPNET Core, Elevation of Privilege, CVE-2025-24070 (Critical)

How the CVE Works:

The vulnerability in ASP.NET Core 9.0, 8.0, and 2.3 arises when the `RefreshSignInAsync` method is called with an improperly authenticated user parameter. This flaw allows an attacker to exploit the authentication mechanism, enabling them to sign into another user’s account without proper authorization. The issue stems from insufficient validation of user credentials during the refresh process, leading to an elevation of privilege. Attackers can leverage this to gain unauthorized access to sensitive data or perform actions on behalf of other users, compromising the security of the application.

DailyCVE Form:

Platform: ASP.NET Core
Version: 9.0.2, 8.0.13, 2.3.0
Vulnerability: Elevation of Privilege
Severity: Critical
Date: 2025-03-11

What Undercode Say:

Exploitation:

Identify Target: Locate an ASP.NET Core application using vulnerable versions (9.0.2, 8.0.13, or 2.3.0).
Craft Malicious Request: Exploit the `RefreshSignInAsync` method by sending a request with an improperly authenticated user parameter.
Gain Access: Use the flaw to impersonate another user and escalate privileges.

Protection:

Update Runtime: Upgrade to patched versions (9.0.3, 8.0.14, or later).
```
dotnet tool update --global dotnet-sdk
```
Validate User Parameters: Ensure proper authentication checks before calling RefreshSignInAsync.
```
if (user.IsAuthenticated) {
await RefreshSignInAsync(user);
}
```
Recompile Applications: Redeploy self-contained applications targeting patched versions.
```
dotnet publish --configuration Release
```

Analytics:

Impact: Critical (Elevation of Privilege)
Affected Systems: ASP.NET Core 9.0, 8.0, 2.3
Patch Availability: Yes (9.0.3, 8.0.14)

Commands:

Check installed .NET versions:
```
dotnet --info
```
Update .NET SDK:
```
dotnet tool update --global dotnet-sdk
```
List affected packages:
```
dotnet list package --vulnerable
```

Code Snippets:

Patch Validation:

var user = await AuthenticateUserAsync();
if (user != null && user.IsAuthenticated) {
await RefreshSignInAsync(user);
}

Logging for Detection:

logger.LogInformation("User {UserId} refreshed sign-in at {Time}", user.Id, DateTime.UtcNow);

References:

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By following these steps, developers can mitigate the risk posed by CVE-2025-24070 and secure their ASP.NET Core applications.

References:

Reported By: https://github.com/advisories/GHSA-2865-hh9g-w894
Extra Source Hub:
Undercode

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