Bug 1566749 (CVE-2017-18258)

Summary:	CVE-2017-18258 libxml2: Unrestricted memory usage in xz_head() function in xzlib.c
Product:	[Other] Security Response	Reporter:	Laura Pardo <lpardo>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	athmanem, c.david86, csutherl, dmoppert, erik-fedora, gzaronik, jclere, ktietz, lgao, mbabacek, mturk, myarboro, ohudlick, pjindal, plodge, rhel-process-autobot, rh-spice-bugs, rjones, slawomir, szappis, twalsh, vchlup, veillard, watson-tool-maintainers, weli
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	libxml2 2.9.6	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-03-31 22:32:15 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:	1566750, 1566751, 1579211, 1695417
Bug Blocks:	1566752

Description Laura Pardo 2018-04-12 23:04:07 UTC

A flaw was found in libxml2 before 2.9.6. The xz_head function in xzlib.c in allows remote attackers to cause a denial of service (memory consumption) via a crafted LZMA file, because the decoder functionality does not restrict memory usage to what is required for a legitimate file.


References:
https://git.gnome.org/browse/libxml2/commit/?id=e2a9122b8dde53d320750451e9907a7dcb2ca8bb

Comment 1 Laura Pardo 2018-04-12 23:04:37 UTC

Created mingw-libxml2 tracking bugs for this issue:

Affects: fedora-all [bug 1566751]
Affects: epel-7 [bug 1566750]

Comment 5 Doran Moppert 2019-04-03 02:49:06 UTC

Note that this patch introduced another vulnerability:  CVE-2018-14567 (flaw bug 1619875), which was in turn fixed by:

https://gitlab.gnome.org/GNOME/libxml2/commit/2240fbf5912

Comment 8 errata-xmlrpc 2020-03-31 19:33:29 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:1190 https://access.redhat.com/errata/RHSA-2020:1190

Comment 9 Product Security DevOps Team 2020-03-31 22:32:15 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-2017-18258