---
title: "CVE-2015-4050\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-2015-4050?format=md
keywords: index, follow
---

# CVE-2015-4050

Publication date 2 June 2015

Last updated 24 July 2024

---

Ubuntu priority

**Medium**

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

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## Description

FragmentListener in the HttpKernel component in Symfony 2.3.19 through
2.3.28, 2.4.9 through 2.4.10, 2.5.4 through 2.5.11, and 2.6.0 through
2.6.7, when ESI or SSI support enabled, does not check if the \_controller
attribute is set, which allows remote attackers to bypass URL signing and
security rules by including (1) no hash or (2) an invalid hash in a request
to /\_fragment.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| symfony | 18.04 LTS bionic | Not affected |
| 17.10 artful | Ignored end of life |
| 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 | Not in release |
| 14.04 LTS trusty | Not in release |
| 12.04 LTS precise | 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-2015-4050?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 |
| --- | --- |
| symfony | * Upstream:   [d320d27](https://github.com/fabpot/symfony/commit/d320d27699abcea12479cf608908fa91bcc133d4) |

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-4050)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2015-4050)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2015-4050)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2015-4050)

### Other references

* <http://symfony.com/blog/cve-2015-4050-esi-unauthorized-access>
* <https://www.cve.org/CVERecord?id=CVE-2015-4050>