# CVE-2008-3906: Other in n/a

> Remote attackers can inject HTTP headers and split responses via CRLF sequences in query strings, affecting Mono's web handling.

- **Severity:** Medium 4.3 (`AV:N/AC:M/Au:N/C:N/I:P/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 4 Sep 2008
- **Updated:** 7 Aug 2024
- **Also known as:** DEBIAN-CVE-2008-3906, GHSA-fwxc-72gp-54jq

## What is CVE-2008-3906?

CVE-2008-3906 is a medium-severity vulnerability in n/a, published on 4 Sep 2008. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

CRLF injection vulnerability in Sys.Web in Mono 2.0 and earlier allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via CRLF sequences in the query string.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2008-3906?

It affects 2 products.


Products: Mono Mono, Mono Project Mono.

## How do I fix CVE-2008-3906?

Upgrade to a fixed version.

## Is CVE-2008-3906 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2008-3906 exists.

Public exploit code:

- Mono 2.0 - 'System.Web' HTTP Header Injection (exploitdb)

## Other vulnerabilities in n/a

- [CVE-2010-4254](https://insights.sbomify.com/CVE-2010-4254/): Code injection in n/a (high 7.5)
- [CVE-2007-5197](https://insights.sbomify.com/CVE-2007-5197/): Memory corruption in n/a (high 7.5)
- [CVE-2010-4159](https://insights.sbomify.com/CVE-2010-4159/): Path traversal in n/a (medium 6.9)
- [CVE-2011-0991](https://insights.sbomify.com/CVE-2011-0991/): Use after free in n/a (medium 6.8)
- [CVE-2006-5072](https://insights.sbomify.com/CVE-2006-5072/): Path traversal in n/a (medium 6.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2008-3906 and fix it if it is affected.

What it is: CVE-2008-3906 is a medium-severity vulnerability in n/a, published on 4 Sep 2008. 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-2008-3906 exists.

Affected product: n/a. 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-2008-3906/ (Markdown: https://insights.sbomify.com/CVE-2008-3906/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2008-3906
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2008-3906
- OSV: https://osv.dev/vulnerability/CVE-2008-3906

---
From sbomify Insights: https://insights.sbomify.com/CVE-2008-3906/
Summaries are generated and may contain mistakes; the official description above is the record.