# CVE-2005-0194: Auth bypass in n/a

> Remote attackers can bypass access controls in Squid proxy if empty ACLs are configured, allowing unauthorized access to protected resources.

- **Severity:** Critical 10.0 (`AV:N/AC:L/Au:N/C:C/I:C/A:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 6 Feb 2005
- **Updated:** 7 Aug 2024
- **Also known as:** DEBIAN-CVE-2005-0194, GHSA-3vc4-p4vg-f376

## What is CVE-2005-0194?

CVE-2005-0194 is a critical authentication bypass vulnerability in n/a, published on 6 Feb 2005. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Squid 2.5, when processing the configuration file, parses empty Access Control Lists (ACLs), including proxy_auth ACLs without defined auth schemes, in a way that effectively removes arguments, which could allow remote attackers to bypass intended ACLs if the administrator ignores the parser warnings.

## Which versions are affected by CVE-2005-0194?

It affects 1 product.


Products: Squid Squid.

## How do I fix CVE-2005-0194?

Upgrade to a fixed version.

## Is CVE-2005-0194 being exploited?

There is no known exploitation of CVE-2005-0194 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2005-1345](https://insights.sbomify.com/CVE-2005-1345/): Missing authorization in n/a (high 7.5)
- [CVE-2005-0173](https://insights.sbomify.com/CVE-2005-0173/): Auth bypass in n/a (high 7.5)
- [CVE-2004-0189](https://insights.sbomify.com/CVE-2004-0189/): Security feature bypass in n/a (high 7.5)
- [CVE-2002-0163](https://insights.sbomify.com/CVE-2002-0163/): Memory corruption in n/a (high 7.5)
- [CVE-2002-0714](https://insights.sbomify.com/CVE-2002-0714/): Security feature bypass in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2005-0194 and fix it if it is affected.

What it is: CVE-2005-0194 is a critical authentication bypass vulnerability in n/a, published on 6 Feb 2005. 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-2005-0194 in the wild and no public exploit code.

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-2005-0194/ (Markdown: https://insights.sbomify.com/CVE-2005-0194/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2005-0194
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2005-0194
- OSV: https://osv.dev/vulnerability/CVE-2005-0194

---
From sbomify Insights: https://insights.sbomify.com/CVE-2005-0194/
Summaries are generated and may contain mistakes; the official description above is the record.