# CVE-2011-1024: Auth bypass in n/a

> Authenticated users can bypass external-program authentication in OpenLDAP when specific chain overlay configurations are enabled.

- **Severity:** Medium 4.6 (`AV:N/AC:H/Au:S/C:P/I:P/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 20 Mar 2011
- **Updated:** 6 Aug 2024
- **Also known as:** DEBIAN-CVE-2011-1024, GHSA-v9w5-g35w-fmjv, RHSA-2011:0346

## What is CVE-2011-1024?

CVE-2011-1024 is a medium-severity authentication bypass vulnerability in Openldap Openldap, published on 20 Mar 2011. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

chain.c in back-ldap in OpenLDAP 2.4.x before 2.4.24, when a master-slave configuration with a chain overlay and ppolicy_forward_updates (aka authentication-failure forwarding) is used, allows remote authenticated users to bypass external-program authentication by sending an invalid password to a slave server.

Weakness: CWE-264

## Which versions are affected by CVE-2011-1024?

It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `compat-openldap` | Red Hat:enterprise_linux:5::server | All versions | 0:2.3.43_2.2.29-12.el5_6.7 |
| `openldap` | Red Hat:enterprise_linux:5::server | All versions | 0:2.3.43-12.el5_6.7 |
| `openldap-clients` | Red Hat:enterprise_linux:5::server | All versions | 0:2.3.43-12.el5_6.7 |
| `openldap-debuginfo` | Red Hat:enterprise_linux:5::server | All versions | 0:2.3.43-12.el5_6.7 |
| `openldap-devel` | Red Hat:enterprise_linux:5::server | All versions | 0:2.3.43-12.el5_6.7 |
| `openldap-servers` | Red Hat:enterprise_linux:5::server | All versions | 0:2.3.43-12.el5_6.7 |
| `openldap-servers-overlays` | Red Hat:enterprise_linux:5::server | All versions | 0:2.3.43-12.el5_6.7 |
| `openldap-servers-sql` | Red Hat:enterprise_linux:5::server | All versions | 0:2.3.43-12.el5_6.7 |

Products: Openldap Openldap.

## How do I fix CVE-2011-1024?

Upgrade to a fixed version.

## Is CVE-2011-1024 being exploited?

There is no known exploitation of CVE-2011-1024 in the wild and no public exploit code.

## Other vulnerabilities in Openldap Openldap

- [CVE-2015-3276](https://insights.sbomify.com/CVE-2015-3276/): Weak cryptography in n/a (high 7.5)
- [CVE-2002-1378](https://insights.sbomify.com/CVE-2002-1378/): Memory corruption in n/a (high 7.5)
- [CVE-2002-1379](https://insights.sbomify.com/CVE-2002-1379/): Code injection in n/a (high 7.5)
- [CVE-2002-0045](https://insights.sbomify.com/CVE-2002-0045/): Missing authorization in n/a (high 7.5)
- [CVE-2005-4442](https://insights.sbomify.com/CVE-2005-4442/): Privilege escalation in n/a (high 7.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2011-1024 and fix it if it is affected.

What it is: CVE-2011-1024 is a medium-severity authentication bypass vulnerability in Openldap Openldap, published on 20 Mar 2011. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2011-1024 in the wild and no public exploit code.

Affected product: Openldap Openldap. 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-2011-1024/ (Markdown: https://insights.sbomify.com/CVE-2011-1024/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2011-1024
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2011-1024
- OSV: https://osv.dev/vulnerability/CVE-2011-1024

---
From sbomify Insights: https://insights.sbomify.com/CVE-2011-1024/
Summaries are generated and may contain mistakes; the official description above is the record.