Bug 1623024 (CVE-2018-15858)

Summary:	CVE-2018-15858 libxkbcommon: NULL pointer dereference when handling invalid aliases in CopyKeyAliasesToKeymap resulting in a crash
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	me, peter.hutterer, xgl-maint
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	libxkbcommon 0.8.1	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-10-26 10:24:40 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:	1623038
Bug Blocks:	1623044

Description Andrej Nemec 2018-08-28 11:55:16 UTC

Unchecked NULL pointer usage when handling invalid aliases in CopyKeyAliasesToKeymap in xkbcomp/keycodes.c in xkbcommon before 0.8.1 could be used by local attackers to crash (NULL pointer dereference) the xkbcommon parser by supplying a crafted keymap file.

Upstream patch:

https://github.com/xkbcommon/libxkbcommon/commit/badb428e63387140720f22486b3acbd3d738859f

References:

https://lists.freedesktop.org/archives/wayland-devel/2018-August/039232.html

Comment 2 Riccardo Schirone 2018-10-26 10:24:40 UTC

I cannot reproduce this NULL dereference, closing it as NOTABUG.