Bug 1862258 (CVE-2020-14347)

Summary:	CVE-2020-14347 xorg-x11-server: Leak of uninitialized heap memory from the X server to clients in AllocatePixmap of dix/pixmap.c
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	ajax, bskeggs, caillon+fedoraproject, jglisse, john.j5live, ofourdan, rhughes, rstrode, sandmann, security-response-team, xgl-maint
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	xorg-server 1.20.9	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the way the Xserver memory was not properly initialized. This issue leak parts of server memory to the X client. In cases where the Xorg server runs with elevated privileges, this flaw results in a possible ASLR bypass.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-12-14 18:47:05 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:	1862319, 1862320, 1862517, 1910717
Bug Blocks:	1862265

Description Guilherme de Almeida Suckevicz 2020-07-30 20:07:40 UTC

Allocation for pixmap data in AllocatePixmap() does not initialize the memory in xserver, it leads to leak uninitialize heap memory to clients. When the X server runs with elevated privileges, this can lead to privilege elevation in the client.

Comment 2 Huzaifa S. Sidhpurwala 2020-07-31 03:18:39 UTC

Acknowledgments:

Name: X.org project
Upstream: Jan-Niklas Sohn (Trend Micro Zero Day Initiative)

Comment 4 msiddiqu 2020-07-31 15:33:13 UTC

Public via: 

https://www.openwall.com/lists/oss-security/2020/07/31/2

Comment 5 msiddiqu 2020-07-31 15:33:35 UTC

Created xorg-x11-server tracking bugs for this issue:

Affects: fedora-all [bug 1862517]

Comment 6 Huzaifa S. Sidhpurwala 2020-08-01 05:29:02 UTC

External References:

https://lists.x.org/archives/xorg-announce/2020-July/003051.html

Comment 8 errata-xmlrpc 2020-12-14 16:29:15 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:5408 https://access.redhat.com/errata/RHSA-2020:5408

Comment 9 Product Security DevOps Team 2020-12-14 18:47:05 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-2020-14347

Comment 11 errata-xmlrpc 2021-05-18 15:11:47 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:1804 https://access.redhat.com/errata/RHSA-2021:1804