---
title: "CVE-2012-4502\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-2012-4502?format=md
keywords: index, follow
---

# CVE-2012-4502

Publication date 5 November 2013

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 overflows in pktlength.c in Chrony before 1.29 allow
remote attackers to cause a denial of service (crash) via a crafted (1)
REQ\_SUBNETS\_ACCESSED or (2) REQ\_CLIENT\_ACCESSES command request to the
PKL\_CommandLength function or crafted (3) RPY\_SUBNETS\_ACCESSED, (4)
RPY\_CLIENT\_ACCESSES, (5) RPY\_CLIENT\_ACCESSES\_BY\_INDEX, or (6)
RPY\_MANUAL\_LIST command reply to the PKL\_ReplyLength function, which
triggers an out-of-bounds read or buffer overflow. NOTE: versions 1.27 and
1.28 do not require authentication to exploit.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| chrony | 17.10 artful | Not affected |
| 17.04 zesty | Ignored end of life |
| 16.10 yakkety | Ignored end of life |
| 16.04 LTS xenial | Not affected |
| 15.10 wily | Ignored end of life |
| 15.04 vivid | Ignored end of life |
| 14.10 utopic | Ignored end of life |
| 14.04 LTS trusty | Not affected |
| 13.10 saucy | Ignored end of life |
| 13.04 raring | Ignored end of life |
| 12.10 quantal | Ignored end of life |
| 12.04 LTS precise | Ignored end of life |
| 10.04 LTS lucid | Ignored end of life |

---

* [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-2012-4502)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2012-4502)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2012-4502)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2012-4502)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2012-4502>