# CVE-2020-1476: ASP.NET and .NET Elevation of Privilege Vulnerability

> Attackers can access restricted cached files via crafted requests, leading to privilege escalation in ASP.NET and .NET applications.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Aug 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-8m4h-93rx-x9x3

## What is CVE-2020-1476?

CVE-2020-1476 is a medium-severity missing authorization vulnerability in Microsoft .Net Framework, published on 17 Aug 2020. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

An elevation of privilege vulnerability exists when ASP.NET or .NET web applications running on IIS improperly allow access to cached files. An attacker who successfully exploited this vulnerability could gain access to restricted files.
To exploit this vulnerability, an attacker would need to send a specially crafted request to an affected server.
The update addresses the vulnerability by changing how ASP.NET and .NET handle requests.

## Which versions are affected by CVE-2020-1476?

It affects 1 product.


Products: Microsoft .Net Framework.

## How do I fix CVE-2020-1476?

No fix has been published for CVE-2020-1476 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-1476 being exploited?

There is no known exploitation of CVE-2020-1476 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft .Net Framework

- [CVE-2020-0646](https://insights.sbomify.com/CVE-2020-0646/): Microsoft .NET Framework Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2017-8759](https://insights.sbomify.com/CVE-2017-8759/): Microsoft .NET Framework Remote Code Execution (high 7.8, exploited in the wild)
- [CVE-2015-1671](https://insights.sbomify.com/CVE-2015-1671/): Microsoft Windows Remote Code Execution (high 7.8, exploited in the wild)
- [CVE-2024-29059](https://insights.sbomify.com/CVE-2024-29059/): Microsoft .NET Framework Information Disclosure (high 7.5, exploited in the wild)
- [CVE-2014-4073](https://insights.sbomify.com/CVE-2014-4073/): Privilege escalation in n/a (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-1476 and fix it if it is affected.

What it is: CVE-2020-1476 is a medium-severity missing authorization vulnerability in Microsoft .Net Framework, published on 17 Aug 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-1476 in the wild and no public exploit code.

Affected product: Microsoft .Net Framework. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2020-1476/ (Markdown: https://insights.sbomify.com/CVE-2020-1476/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-1476
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-1476
- OSV: https://osv.dev/vulnerability/CVE-2020-1476

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-1476/
Summaries are generated and may contain mistakes; the official description above is the record.