---
title: "CVE-2009-4212\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-2009-4212?format=md
keywords: index, follow
---

# CVE-2009-4212

Publication date 12 January 2010

Last updated 24 July 2024

---

Ubuntu priority

**Medium**

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

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## Description

Multiple integer underflows in the (1) AES and (2) RC4 decryption
functionality in the crypto library in MIT Kerberos 5 (aka krb5) 1.3
through 1.6.3, and 1.7 before 1.7.1, allow remote attackers to cause a
denial of service (daemon crash) or possibly execute arbitrary code by
providing ciphertext with a length that is too short to be valid.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| krb5 | 9.10 karmic | Fixed 1.7dfsg~beta3-1ubuntu0.3 |
| 9.04 jaunty | Fixed 1.6.dfsg.4~beta1-5ubuntu2.2 |
| 8.10 intrepid | Fixed 1.6.dfsg.4~beta1-3ubuntu0.3 |
| 8.04 LTS hardy | Fixed 1.6.dfsg.3~beta1-2ubuntu1.3 |
| 6.06 LTS dapper | Fixed 1.4.3-5ubuntu0.10 |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-4212)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2009-4212)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2009-4212)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2009-4212)

### Related Ubuntu Security Notices (USN)

+ [USN-881-1](https://usn.ubuntu.com/USN-881-1)
+ Kerberos vulnerability
+ 12 January 2010

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2009-4212>