Bug 1649481

Summary:	php: memory leak in the garbage collector when using cyclic references
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
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	php 7.2.12, php 7.1.24	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-11-16 09:51:50 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:	1649482, 1649483
Bug Blocks:	1649486

Description Laura Pardo 2018-11-13 17:05:57 UTC

A flaw was found in php before versions 7.2.12 and 7.1.24. When a specifically structured cyclic reference is created the garbage collector fails to detect it which causes the references to never be freed. This leads to a memory leak.


References:
https://bugs.php.net/bug.php?id=76946
https://secure.php.net/ChangeLog-7.php

Upstream Patch:
http://git.php.net/?p=php-src.git;a=commit;h=83e2b9e2202da6cc25bdaac67a58022b90be88e7

Comment 1 Laura Pardo 2018-11-13 17:06:27 UTC

Created php tracking bugs for this issue:

Affects: fedora-all [bug 1649482]

Comment 3 Stefan Cornelius 2018-11-16 09:51:50 UTC

I think this qualifies more as "normal" bug than a security issue: overall, the chances of this happening are rare, I doubt that this is really suitable to be triggered remotely (to a degree where this becomes a real problem), and if you can execute PHP code, you can do much worse than this.

Thus, from a security perspective, I'll close this as NOTABUG.