# CVE-2013-1337: Auth bypass in n/a

> Remote attackers can bypass authentication in custom WCF endpoints using HTTPS passwords, allowing unauthorized access to protected services.

- **Severity:** High 7.5 (`AV:N/AC:L/Au:N/C:P/I:P/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 May 2013
- **Updated:** 6 Aug 2024
- **Also known as:** GHSA-73vm-jqp4-fcg6

## What is CVE-2013-1337?

CVE-2013-1337 is a high-severity authentication bypass vulnerability in Microsoft .Net Framework, published on 15 May 2013. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Microsoft .NET Framework 4.5 does not properly create policy requirements for custom Windows Communication Foundation (WCF) endpoint authentication in certain situations involving passwords over HTTPS, which allows remote attackers to bypass authentication by sending queries to an endpoint, aka "Authentication Bypass Vulnerability."

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2013-1337?

It affects 1 product.


Products: Microsoft .Net Framework.

## How do I fix CVE-2013-1337?

No fix has been published for CVE-2013-1337 yet. Limit exposure of the affected software until one is available.

## Is CVE-2013-1337 being exploited?

There is no known exploitation of CVE-2013-1337 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-2013-1337 and fix it if it is affected.

What it is: CVE-2013-1337 is a high-severity authentication bypass vulnerability in Microsoft .Net Framework, published on 15 May 2013. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2013-1337 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-2013-1337/ (Markdown: https://insights.sbomify.com/CVE-2013-1337/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2013-1337
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2013-1337
- OSV: https://osv.dev/vulnerability/CVE-2013-1337

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From sbomify Insights: https://insights.sbomify.com/CVE-2013-1337/
Summaries are generated and may contain mistakes; the official description above is the record.