[SECURITY] [DLA 1707-1] symfony security update

Package : symfony
Version : 2.3.21+dfsg-4+deb8u4
CVE ID : CVE-2017-16652 CVE-2017-16654 CVE-2018-11385 CVE-2018-11408
CVE-2018-14773 CVE-2018-19789 CVE-2018-19790

Several security vulnerabilities have been discovered in symfony, a PHP
web application framework. Numerous symfony components are affected:
Security, bundle readers, session handling, SecurityBundle,
HttpFoundation, Form, and Security\Http.

The corresponding upstream advisories contain further details:

[CVE-2017-16652]
https://symfony.com/blog/cve-2017-16652-open-redirect-vulnerability-on-security-handlers

[CVE-2017-16654]
https://symfony.com/blog/cve-2017-16654-intl-bundle-readers-breaking-out-of-paths

[CVE-2018-11385]
https://symfony.com/blog/cve-2018-11385-session-fixation-issue-for-guard-authentication

[CVE-2018-11408]
https://symfony.com/blog/cve-2018-11408-open-redirect-vulnerability-on-security-handlers

[CVE-2018-14773]
https://symfony.com/blog/cve-2018-14773-remove-support-for-legacy-and-risky-http-headers

[CVE-2018-19789]
https://symfony.com/blog/cve-2018-19789-disclosure-of-uploaded-files-full-path

[CVE-2018-19790]
https://symfony.com/blog/cve-2018-19790-open-redirect-vulnerability-when-using-security-http

For Debian 8 "Jessie", these problems have been fixed in version
2.3.21+dfsg-4+deb8u4.

We recommend that you upgrade your symfony packages.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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