[HttpFoundation] Fix to prevent magic bytes injection in JSONP responses (Prevents CVE-2014-4671)
Remove Spaceless Blocks from Twig Form Templates

In favor of using Twig's whitespace control operators. See #11277
bug #11386 Remove Spaceless Blocks from Twig Form Templates (chrisguitarguy)

This PR was merged into the 2.3 branch.

Discussion
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Remove Spaceless Blocks from Twig Form Templates

In favor of using Twig's whitespace control operators. See #11277

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #11277
| License       | MIT
| Doc PR        |

Per @fabpot and @stof's requests in #11278, this is a PR for the 2.3 branch.

Commits
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8f9ed3e Remove Spaceless Blocks from Twig Form Templates
Fix UserPassword validator translation
minor #11387 [2.3] [Validator] Fix UserPassword validator translation (redstar504)

This PR was merged into the 2.3 branch.

Discussion
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[2.3] [Validator] Fix UserPassword validator translation

| Q             | A
| ------------- | ---
| Fixed tickets | None
| License       | MIT

Fixes the UserPassword translation message only for 2.3 as discussed in symfony/symfony#11383.

Commits
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73d50ed Fix UserPassword validator translation
feature #11367 [HttpFoundation] Fix to prevent magic bytes injection in JSONP responses... (CVE-2014-4671) (Andrew Moore)

This PR was merged into the 2.3 branch.

Discussion
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[HttpFoundation] Fix to prevent magic bytes injection in JSONP responses... (CVE-2014-4671)

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no*
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | N/A
| License       | MIT
| Doc PR        | N/A
| CVE Ticket   | [CVE-2014-4671](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-4671)
| See Also | [Rosetta Flash](http://miki.it/blog/2014/7/8/abusing-jsonp-with-rosetta-flash/)

\* Unless you are parsing the response string manually, which you really shouldn't do anyway

**THIS IS A SECURITY FIX AND SHOULD BE MERGED SHORTLY**

This fix prevents attacks vectors where third-party browser plugins depends on ASCII magic bytes in order to execute a plugin. This is currently exploited with Flash using a carefully crafted JSONP response, allowing the execution of random SWF data from a domain with a vulnerable JSONP endpoint.

This security issue is mitigated by adding an empty comment right before the callback parameter. This does not affect the execution of the JSONP callback.

Commits
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6af3d05 [HttpFoundation] Fix to prevent magic bytes injection in JSONP responses (Prevents CVE-2014-4671)
Validate locales sets intos translator
updated CHANGELOG for 2.3.18
update CONTRIBUTORS for 2.3.18
updated VERSION for 2.3.18
bumped Symfony version to 2.3.19