Bug 1227264 (CVE-2015-4050)

Summary:	CVE-2015-4050 php-symfony: ESI unauthorized access
Product:	[Other] Security Response	Reporter:	Martin Prpič <mprpic>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED CURRENTRELEASE	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	fedora, jrusnack, mprpic, shawn
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	symfony 2.3.29, symfony 2.5.12, symfony 2.6.8	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-07-20 12:21:24 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1227265, 1227266, 1227267
Bug Blocks:

Description Martin Prpič 2015-06-02 09:28:57 UTC

The following flaw was found in Symfony, a PHP framework for web projects:

Applications with ESI or SSI support enabled, that use the FragmentListener, are vulnerable to unauthorized access. A malicious user can call any controller via the /_fragment path by providing an invalid hash in the URL (or removing it), bypassing URL signing and security rules.

FragmentListener throws an AccessDeniedHttpException in case URL is not signed correctly. However, the ExceptionListener triggers kernel events again by making a sub-request. Since the FragmentListener does no signing for sub-requests, the controller is called even though the original request was forbidden. As a result the user receives a 403 response with content generated by the controller.

This issue is fixed in Symfony 2.3.29, 2.5.12, and 2.6.8.

Upstream patch:

https://github.com/fabpot/symfony/commit/d320d27699abcea12479cf608908fa91bcc133d4

External References:

http://symfony.com/blog/cve-2015-4050-esi-unauthorized-access

Comment 1 Martin Prpič 2015-06-02 09:29:34 UTC

Created php-symfony tracking bugs for this issue:

Affects: fedora-all [bug 1227265]
Affects: epel-6 [bug 1227266]
Affects: epel-7 [bug 1227267]

Comment 2 Fedora Update System 2015-06-05 23:49:48 UTC

php-symfony-2.5.12-1.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 3 Fedora Update System 2015-06-06 00:04:14 UTC

php-symfony-2.5.12-1.fc22 has been pushed to the Fedora 22 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 4 Fedora Update System 2015-06-06 00:05:32 UTC

php-symfony-2.5.12-1.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 5 Fedora Update System 2015-06-18 18:34:08 UTC

php-symfony-2.5.12-1.el7 has been pushed to the Fedora EPEL 7 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 6 Fedora Update System 2015-07-08 17:04:02 UTC

php-symfony-2.3.30-1.el6 has been pushed to the Fedora EPEL 6 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 7 Shawn Iwinski 2015-07-20 01:58:32 UTC

All dependent bugs have been closed, can this tracking bug be closed as well?

Comment 8 Martin Prpič 2015-07-20 12:21:24 UTC

(In reply to Shawn Iwinski from comment #7)
> All dependent bugs have been closed, can this tracking bug be closed as well?

Definitely!