Bug 1620252 (CVE-2017-16790)

Summary: CVE-2017-16790 php-symfony: Information Exposure due to an improper check of FileType on submitted data
Product: [Other] Security Response Reporter: Laura Pardo <lpardo>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED UPSTREAM QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: fedora, james.hogarth, shawn
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: symfony 2.7.38, symfony 2.8.31, symfony 3.2.14, symfony 3.3.13, symfony 3.4-BETA5, symfony 4.0-BETA5 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2019-06-10 10:36:17 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: 1620253, 1620254, 1620255, 1620256    
Bug Blocks:    

Description Laura Pardo 2018-08-22 20:21:24 UTC
An issue was discovered in Symfony before 2.7.38, 2.8.31, 3.2.14, 3.3.13, 3.4-BETA5, and 4.0-BETA5. When a form is submitted by the user, the request handler classes of the Form component merge POST data and uploaded files data into one array. This big array forms the data that are then bound to the form. At this stage there is no difference anymore between submitted POST data and uploaded files. A user can send a crafted HTTP request where the value of a "FileType" is sent as normal POST data that could be interpreted as a local file path on the server-side (for example, "file:///etc/passwd"). If the application did not perform any additional checks about the value submitted to the "FileType", the contents of the given file on the server could have been exposed to the attacker. 


References:
https://symfony.com/blog/cve-2017-16790-ensure-that-submitted-data-are-uploaded-files

Comment 1 Laura Pardo 2018-08-22 20:22:08 UTC
Created php-symfony tracking bugs for this issue:

Affects: epel-7 [bug 1620254]
Affects: fedora-27 [bug 1620253]


Created php-symfony3 tracking bugs for this issue:

Affects: fedora-28 [bug 1620256]


Created php-symfony4 tracking bugs for this issue:

Affects: fedora-all [bug 1620255]

Comment 2 Product Security DevOps Team 2019-06-10 10:36:17 UTC
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.