Bug 1518475 (CVE-2017-16612)

Summary:	CVE-2017-16612 libXcursor: file.c: heap-based buffer overflow when reading/creating images
Product:	[Other] Security Response	Reporter:	Sam Fowler <sfowler>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	ajax, alexl, btissoir, caillon+fedoraproject, jglisse, john.j5live, rhughes, rstrode, sandmann
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	libXcursor 1.1.15	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-12-01 11:36:39 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:	1518479
Bug Blocks:	1518481

Description Sam Fowler 2017-11-29 03:14:23 UTC

libXcursor before version 1.1.15 is vulnerable to heap overflows when parsing malicious files. (CVE-2017-16612) An attacker could use local privileges or trick a user into parsing a malicious file in order to gain control of a system.

It is possible to trigger heap overflows due to an integer overflow while parsing images and a signedness issue while parsing comments.

References:
http://openwall.com/lists/oss-security/2017/11/28/6
https://cgit.freedesktop.org/xorg/lib/libXcursor/commit/?id=4794b5dd34688158fb51a2943032569d3780c4b8

Comment 1 Sam Fowler 2017-11-29 03:25:26 UTC

Created libXcursor tracking bugs for this issue:

Affects: fedora-all [bug 1518479]

Comment 3 Stefan Cornelius 2017-11-30 10:42:06 UTC

There are 2 distinct issues covered in by this CVE:
- a signedness error when loading cursor files containing comments with a specially crafted length
- an integer overflow when loading cursor files containing images with a specially crafted width/height combination

Comment 5 Stefan Cornelius 2017-12-01 12:18:56 UTC

Statement:

This issue affects the versions of libXcursor as shipped with Red Hat Enterprise Linux 5. Red Hat Enterprise Linux 5 is now in Extended Life Cycle phase of the support and maintenance life cycle. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.

This issue affects the versions of libXcursor as shipped with Red Hat Enterprise Linux 6. Red Hat Enterprise Linux 6 is now in Production 3 Phase of the support and maintenance life cycle. This has been rated as having Moderate security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.

This issue affects the versions of libXcursor as shipped with Red Hat Enterprise Linux 7. Red Hat Product Security has rated this issue as having Moderate security impact. A future update may address this issue. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.