Bug 1688947 (CVE-2019-9675)

Summary:	CVE-2019-9675 php: buffer overflow in ext/phar/tar.c
Product:	[Other] Security Response	Reporter:	Laura Pardo <lpardo>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	fedora, hhorak, jorton, rcollet, webstack-team, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	php 7.1.27, php 7.3.3, php 7.3.3	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-03-26 10:27:05 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:	1688948
Bug Blocks:	1690827

Description Laura Pardo 2019-03-14 18:32:57 UTC

An issue was discovered in PHP 7.x before 7.1.27 and 7.3.x before 7.3.3. phar_tar_writeheaders_int in ext/phar/tar.c has a buffer overflow via a long link value. NOTE: The vendor indicates that the link value is used only when an archive contains a symlink, which currently cannot happen: "This issue allows theoretical compromise of security, but a practical attack is usually impossible."


Upstream Bug:
https://bugs.php.net/bug.php?id=77586

Upstream Patch:
http://git.php.net/?p=php-src.git;a=commitdiff;h=e0f5d62bd6690169998474b62f92a8c5ddf0e699

Comment 1 Laura Pardo 2019-03-14 18:33:11 UTC

Created php tracking bugs for this issue:

Affects: fedora-all [bug 1688948]

Comment 4 Riccardo Schirone 2019-03-26 10:27:05 UTC

This is not a real flaw for now, as the code cannot be reached as stated by upstream.

Comment 5 Riccardo Schirone 2019-03-26 10:27:44 UTC

See https://bugs.php.net/bug.php?id=65332 "phar follows symlinks instead of adding them".

Comment 6 Doran Moppert 2020-02-11 00:31:36 UTC

Statement:

Red Hat Product Security determined that this flaw was not a security vulnerability. See the Bugzilla link for more details.