---
title: "CVE-2011-1527\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-2011-1527?format=md
keywords: index, follow
---

# CVE-2011-1527

Publication date 18 October 2011

Last updated 24 July 2024

---

Ubuntu priority

**Medium**

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

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## Description

The kdb\_ldap plugin in the Key Distribution Center (KDC) in MIT Kerberos 5
(aka krb5) 1.9 through 1.9.1, when the LDAP back end is used, allows remote
attackers to cause a denial of service (NULL pointer dereference and daemon
crash) via a kinit operation with incorrect string case for the realm,
related to the is\_principal\_in\_realm, krb5\_set\_error\_message,
krb5\_ldap\_get\_principal, and process\_as\_req functions.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2011-1527?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| krb5 | 11.10 oneiric | Fixed 1.9.1+dfsg-1ubuntu1.1 |
| 11.04 natty | Not affected |
| 10.10 maverick | Not affected |
| 10.04 LTS lucid | Not affected |
| 8.04 LTS hardy | Not affected |

---

* [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-2011-1527?format=md#patch-details)

## Notes

---

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

CRD Tuesday, 18 October 2011, at 14:00 US/Eastern time
krb5 1.9 only

### 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 |
| --- | --- |
| krb5 | * Upstream:   <http://web.mit.edu/kerberos/advisories/2011-006-patch-r18.txt> |

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1527)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2011-1527)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2011-1527)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2011-1527)

### Related Ubuntu Security Notices (USN)

+ [USN-1233-1](https://usn.ubuntu.com/USN-1233-1)
+ Kerberos Vulnerabilities
+ 18 October 2011

### Other references

* <http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-006.txt>
* <https://www.cve.org/CVERecord?id=CVE-2011-1527>