# CVE-2012-4392: Auth bypass in n/a

> Remote attackers can bypass authentication in ownCloud by crafting a malicious oc_token cookie, gaining unauthorized access to user accounts.

- **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:** 5 Sep 2012
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-rv2q-w6gm-pjm2

## What is CVE-2012-4392?

CVE-2012-4392 is a high-severity authentication bypass vulnerability in Owncloud Owncloud Server, published on 5 Sep 2012. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

index.php in ownCloud 4.0.7 does not properly validate the oc_token cookie, which allows remote attackers to bypass authentication via a crafted oc_token cookie value.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2012-4392?

It affects 1 product.


Products: Owncloud Owncloud Server.

## How do I fix CVE-2012-4392?

No fix has been published for CVE-2012-4392 yet. Limit exposure of the affected software until one is available.

## Is CVE-2012-4392 being exploited?

There is no known exploitation of CVE-2012-4392 in the wild and no public exploit code.

## Other vulnerabilities in Owncloud Owncloud Server

- [CVE-2023-49105](https://insights.sbomify.com/CVE-2023-49105/): ownCloud Improper Authentication (critical 9.8, exploited in the wild)
- [CVE-2015-7699](https://insights.sbomify.com/CVE-2015-7699/): Code injection in n/a (critical 9.0)
- [CVE-2015-6500](https://insights.sbomify.com/CVE-2015-6500/): Path traversal in n/a (high 7.5)
- [CVE-2014-2051](https://insights.sbomify.com/CVE-2014-2051/): Code injection in n/a (high 7.5)
- [CVE-2014-2054](https://insights.sbomify.com/CVE-2014-2054/): PHPExcel vulnerable to XXE attacks through libxml (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2012-4392 and fix it if it is affected.

What it is: CVE-2012-4392 is a high-severity authentication bypass vulnerability in Owncloud Owncloud Server, published on 5 Sep 2012. 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-2012-4392 in the wild and no public exploit code.

Affected product: Owncloud Owncloud Server. 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-2012-4392/ (Markdown: https://insights.sbomify.com/CVE-2012-4392/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2012-4392
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2012-4392
- OSV: https://osv.dev/vulnerability/CVE-2012-4392

---
From sbomify Insights: https://insights.sbomify.com/CVE-2012-4392/
Summaries are generated and may contain mistakes; the official description above is the record.