---
title: "CVE-2013-4623\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-2013-4623?format=md
keywords: index, follow
---

# CVE-2013-4623

Publication date 30 September 2013

Last updated 24 July 2024

---

Ubuntu priority

**Medium**

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

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## Description

The x509parse\_crt function in x509.h in PolarSSL 1.1.x before 1.1.7 and
1.2.x before 1.2.8 does not properly parse certificate messages during the
SSL/TLS handshake, which allows remote attackers to cause a denial of
service (infinite loop and CPU consumption) via a certificate message that
contains a PEM encoded certificate.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| mbedtls | 17.04 zesty | Not affected |
| 16.10 yakkety | Not affected |
| 16.04 LTS xenial | Not affected |
| 15.10 wily | Not in release |
| 14.04 LTS trusty | Not in release |
| 12.04 LTS precise | Not in release |
| polarssl | 17.04 zesty | Not in release |
| 16.10 yakkety | Not in release |
| 16.04 LTS xenial | Not in release |
| 15.10 wily | Not affected |
| 15.04 vivid | Not affected |
| 14.10 utopic | Not affected |
| 14.04 LTS trusty | Not in release |
| 13.10 saucy | Not affected |
| 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)
* [Patch details](https://ubuntu.com/security/CVE-2013-4623?format=md#patch-details)

### 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 |
| --- | --- |
| polarssl | * Upstream:   [1922a4e](https://github.com/polarssl/polarssl/commit/1922a4e6aade7b1d685af19d4d9339ddb5c02859) |

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-4623)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2013-4623)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2013-4623)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2013-4623)

### Other references

* <https://polarssl.org/tech-updates/security-advisories/polarssl-security-advisory-2013-03>
* <https://www.cve.org/CVERecord?id=CVE-2013-4623>