# CVE-2007-0042: Information disclosure in n/a

> Remote attackers can access configuration files and bypass security constraints via null byte injection in ASP.NET, exposing sensitive information.

- **Severity:** High 7.8 (`AV:N/AC:L/Au:N/C:C/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Jul 2007
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-2r87-96mr-fgv7

## What is CVE-2007-0042?

CVE-2007-0042 is a high-severity vulnerability in Microsoft .Net Framework, published on 10 Jul 2007. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Interpretation conflict in ASP.NET in Microsoft .NET Framework 1.0, 1.1, and 2.0 for Windows 2000, XP, Server 2003, and Vista allows remote attackers to access configuration files and obtain sensitive information, and possibly bypass security mechanisms that try to constrain the final substring of a string, via %00 characters, related to use of %00 as a string terminator within POSIX functions but a data character within .NET strings, aka "Null Byte Termination Vulnerability."

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2007-0042?

It affects 1 product.


Products: Microsoft .Net Framework.

## How do I fix CVE-2007-0042?

No fix has been published for CVE-2007-0042 yet. Limit exposure of the affected software until one is available.

## Is CVE-2007-0042 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2007-0042 exists.

Public exploit code:

- Microsoft .Net Framework 2.0 - Multiple Null Byte Injection Vulnerabilities (exploitdb)

## 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-2007-0042 and fix it if it is affected.

What it is: CVE-2007-0042 is a high-severity vulnerability in Microsoft .Net Framework, published on 10 Jul 2007. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2007-0042 exists.

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-2007-0042/ (Markdown: https://insights.sbomify.com/CVE-2007-0042/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2007-0042
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2007-0042
- OSV: https://osv.dev/vulnerability/CVE-2007-0042

---
From sbomify Insights: https://insights.sbomify.com/CVE-2007-0042/
Summaries are generated and may contain mistakes; the official description above is the record.