Bug 1374698 (CVE-2016-7125)

Summary: CVE-2016-7125 php: Session Data Injection Vulnerability
Product: [Other] Security Response Reporter: Martin Prpič <mprpic>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: abhgupta, dmcphers, fedora, hhorak, jialiu, jokerman, jorton, kseifried, lmeyer, mmccomas, rcollet, tiwillia, webstack-team, yozone
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: php 5.6.25, php 7.0.10 Doc Type: If docs needed, set a value
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Story Points: ---
Clone Of: Environment:
Last Closed: 2016-10-20 06:08:03 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:    
Bug Blocks: 1374715    

Description Martin Prpič 2016-09-09 13:00:20 UTC 
The following flaw was found in PHP:

If the session name is not allowed, then session php handler will ignore and skip the name, and continue to parsing. This means that if an attacker can control the session name, then he will be able to inject arbitrarily session data. The similar issue also exist in session php_binary handler.

Upstream bug:

https://bugs.php.net/bug.php?id=72681

Upstream patch:

https://github.com/php/php-src/commit/8763c6090d627d8bb0ee1d030c30e58f406be9ce?w=1
Comment 1 Huzaifa S. Sidhpurwala 2016-10-20 06:08:03 UTC 
Analysis:

In order to exploit this, you need a MITM attacker to know the session name. Then the attacker will be able to hijack the session and control the data passing between the server and the client. The PHP script however needs to run special code in order for the attacker to pull this off.
Comment 2 errata-xmlrpc 2016-11-15 11:44:59 UTC 
This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 6
  Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7
  Red Hat Software Collections for Red Hat Enterprise Linux 7.2 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS

Via RHSA-2016:2750 https://rhn.redhat.com/errata/RHSA-2016-2750.html