# CVE-2006-0805: Security feature bypass in n/a

> Remote attackers can bypass CAPTCHA controls in php-Nuke by replaying fixed challenge/response pairs derived from the User Agent.

- **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:** 21 Feb 2006
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-7q52-9rpc-8p4f

## What is CVE-2006-0805?

CVE-2006-0805 is a high-severity vulnerability in Francisco Burzi Php-Nuke, published on 21 Feb 2006. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The CAPTCHA functionality in php-Nuke 6.0 through 7.9 uses fixed challenge/response pairs that only vary once per day based on the User Agent (HTTP_USER_AGENT), which allows remote attackers to bypass CAPTCHA controls by fixing the User Agent, performing a valid challenge/response, then replaying that pair in the random_num and gfx_check parameters.

## Which versions are affected by CVE-2006-0805?

It affects 1 product.


Products: Francisco Burzi Php-Nuke.

## How do I fix CVE-2006-0805?

No fix has been published for CVE-2006-0805 yet. Limit exposure of the affected software until one is available.

## Is CVE-2006-0805 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2006-0805 exists.

Public exploit code:

- PHP-Nuke 7.x - CAPTCHA Bypass (exploitdb)

## Other vulnerabilities in Francisco Burzi Php-Nuke

- [CVE-2005-3016](https://insights.sbomify.com/CVE-2005-3016/): Other in n/a (critical 10.0)
- [CVE-2001-1025](https://insights.sbomify.com/CVE-2001-1025/): SQL injection in n/a (critical 10.0)
- [CVE-2001-0320](https://insights.sbomify.com/CVE-2001-0320/): Path traversal in n/a (critical 10.0)
- [CVE-2007-6376](https://insights.sbomify.com/CVE-2007-6376/): Path traversal in n/a (high 7.5)
- [CVE-2003-1435](https://insights.sbomify.com/CVE-2003-1435/): SQL injection in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2006-0805 and fix it if it is affected.

What it is: CVE-2006-0805 is a high-severity vulnerability in Francisco Burzi Php-Nuke, published on 21 Feb 2006. 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-2006-0805 exists.

Affected product: Francisco Burzi Php-Nuke. 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-2006-0805/ (Markdown: https://insights.sbomify.com/CVE-2006-0805/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2006-0805
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2006-0805
- OSV: https://osv.dev/vulnerability/CVE-2006-0805

---
From sbomify Insights: https://insights.sbomify.com/CVE-2006-0805/
Summaries are generated and may contain mistakes; the official description above is the record.