Bug 1685132 (CVE-2019-9021)

Summary: CVE-2019-9021 php: Heap-based buffer over-read in PHAR reading functions
Product: [Other] Security Response Reporter: Dhananjay Arunesh <darunesh>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: hhorak, jorton, patalber, rcollet, webstack-team
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: php 5.6.40, php 7.1.26, php 7.2.14, php 7.3.1 Doc Type: If docs needed, set a value
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Story Points: ---
Clone Of: Environment:
Last Closed: 2019-08-19 08:47:41 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 1709125, 1709126, 1709127, 1709128, 1709129    
Bug Blocks: 1680558    

Description Dhananjay Arunesh 2019-03-04 12:32:23 UTC
An issue was discovered in PHP before 5.6.40, 7.x before 7.1.26, 7.2.x before 7.2.14, and 7.3.x before 7.3.1. A heap-based buffer over-read in PHAR reading functions in the PHAR extension may allow an attacker to read allocated or unallocated memory past the actual data when trying to parse the file name, a different vulnerability than CVE-2018-20783. This is related to phar_detect_phar_fname_ext in ext/phar/phar.c.

References:
https://bugs.php.net/bug.php?id=77247

Upstrean commit:
http://git.php.net/?p=php-src.git;a=commit;h=428d8164ffcf6f75a6cc9d4056e54bfd450dac03
http://git.php.net/?p=php-src.git;a=commit;h=78bd3477745f1ada9578a79f61edb41886bec1cb
http://git.php.net/?p=php-src.git;a=commit;h=9d388b95c54ea053ce6f194defe1ff6673195747

Comment 1 Huzaifa S. Sidhpurwala 2019-05-13 04:51:15 UTC
Analysis: 

Essentially an OOB read in the PHAR code, which can be triggered by malicious PHAR files. Obviously the php script needs to allow users (attackers) to upload arbitrary PHAR files and they need to be processed via Phar() function. Impact is PHP crash due to OOB read.

Comment 3 errata-xmlrpc 2019-08-19 08:42:41 UTC
This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 7
  Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS

Via RHSA-2019:2519 https://access.redhat.com/errata/RHSA-2019:2519

Comment 4 Product Security DevOps Team 2019-08-19 08:47:41 UTC
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-9021

Comment 5 errata-xmlrpc 2019-11-01 13:01:23 UTC
This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 7
  Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS

Via RHSA-2019:3299 https://access.redhat.com/errata/RHSA-2019:3299

Comment 6 errata-xmlrpc 2020-04-28 15:31:39 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:1624 https://access.redhat.com/errata/RHSA-2020:1624