Bug 1359828 (CVE-2016-6297)

Summary: CVE-2016-6297 php: Stack-based buffer overflow vulnerability in php_stream_zip_opener
Product: [Other] Security Response Reporter: Adam Mariš <amaris>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: abhgupta, apmukher, dmcphers, fedora, hhorak, jialiu, jokerman, jorton, kseifried, lmeyer, mmccomas, rcollet, tiwillia, webstack-team
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: php 5.5.38, php 5.6.24, php 7.0.9 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2016-09-26 18:18:12 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: 1359837    
Bug Blocks: 1359830    

Description Adam Mariš 2016-07-25 14:00:57 UTC 
It was found that when opening a zip stream, php_stream_zip_opener fails to check the path_len that is vulnerable to integer overflow. It is later used to calculate the length of mempcy that can lead to buffer overflow and memory corruption.

Upstream bug:

https://bugs.php.net/bug.php?id=72520

Upstream patch:

http://git.php.net/?p=php-src.git;a=commit;h=81406c0c1d45f75fcc7972ed974d2597abb0b9e9

CVE assignment:

http://seclists.org/oss-sec/2016/q3/137
Comment 1 Adam Mariš 2016-07-25 14:10:15 UTC 
Created php tracking bugs for this issue:

Affects: fedora-all [bug 1359837]
Comment 2 Stefan Cornelius 2016-09-21 09:17:09 UTC 
The affected function has to be used in a very specific way. It's unlikely that this function is used in a way that lends it to exploitation.

Compile time buffer overflow protection should mitigate this problem, preventing exploitation to gain code execution. Thus, this should be limited to a crash only.
Comment 3 errata-xmlrpc 2016-11-15 11:44:26 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