---
title: "CVE-2011-1024\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2011-1024?format=md
keywords: index, follow
---

# CVE-2011-1024

Publication date 19 March 2011

Last updated 24 July 2024

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

Toggle side navigation

## 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.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2011-1024?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| openldap | 10.10 maverick | Fixed 2.4.23-0ubuntu3.5 |
| 10.04 LTS lucid | Fixed 2.4.21-0ubuntu5.4 |
| 9.10 karmic | Fixed 2.4.18-0ubuntu1.2 |
| 8.04 LTS hardy | Not in release |
| 6.06 LTS dapper | Not in release |
| openldap2.2 | 10.10 maverick | Not in release |
| 10.04 LTS lucid | Not in release |
| 9.10 karmic | Not in release |
| 8.04 LTS hardy | Not in release |
| 6.06 LTS dapper | Not affected |
| openldap2.3 | 10.10 maverick | Not in release |
| 10.04 LTS lucid | Not in release |
| 9.10 karmic | Not in release |
| 8.04 LTS hardy | Fixed 2.4.9-0ubuntu0.8.04.5 |
| 6.06 LTS dapper | Not in release |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)
* [Patch details](https://ubuntu.com/security/CVE-2011-1024?format=md#patch-details)

## Notes

---

### [jdstrand](https://launchpad.net/~jdstrand)

openldap 2.2 does not use callbacks for checking if back-ldap
returned any results

### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| openldap | * Vendor:   <https://rhn.redhat.com/errata/RHSA-2011-0347.html> |

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1024)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2011-1024)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2011-1024)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2011-1024)

### Related Ubuntu Security Notices (USN)

+ [USN-1100-1](https://usn.ubuntu.com/USN-1100-1)
+ OpenLDAP vulnerabilities
+ 31 March 2011

### Other references

* <http://www.openldap.org/its/index.cgi/Software%20Bugs?id=6607>
* <https://www.cve.org/CVERecord?id=CVE-2011-1024>