Bug 1680545 (CVE-2018-20783)

Summary:	CVE-2018-20783 php: Buffer over-read in PHAR reading functions
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	hhorak, jorton, rcollet, webstack-team
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	php 5.6.39, php 7.0.33, php 7.1.25, php 7.2.13, php 7.3.0	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-08-19 08:47:36 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:	1709098, 1709099, 1709100, 1709101, 1709102
Bug Blocks:	1680558

Description Dhananjay Arunesh 2019-02-25 10:03:30 UTC

In PHP before 5.6.39, 7.x before 7.0.33, 7.1.x before 7.1.25, and 7.2.x before 7.2.13, a buffer over-read in PHAR reading functions may allow an attacker to read allocated or unallocated memory past the actual data when trying to parse a .phar file. This is related to phar_parse_pharfile in ext/phar/phar.c.

Reference:
https://bugs.php.net/bug.php?id=77143

Comment 2 Tomas Hoger 2019-02-25 14:19:14 UTC

Upstream commit:

http://git.php.net/?p=php-src.git;a=commitdiff;h=e7c8e6cde021afd637ea535b0641a1851e57fb2a

Comment 3 Huzaifa S. Sidhpurwala 2019-05-13 04:10:12 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 5 errata-xmlrpc 2019-08-19 08:42:37 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 6 Product Security DevOps Team 2019-08-19 08:47:36 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-2018-20783

Comment 7 errata-xmlrpc 2019-11-01 13:01:19 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 8 errata-xmlrpc 2020-04-28 15:31:31 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