Bug 1623024 – CVE-2018-15858 libxkbcommon: NULL pointer dereference when handling invalid aliases in CopyKeyAliasesToKeymap resulting in a crash

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Bug 1623024 - (CVE-2018-15858) CVE-2018-15858 libxkbcommon: NULL pointer dereference when handling invalid aliases in CopyKeyAliasesToKeymap resulting in a crash

Summary:	CVE-2018-15858 libxkbcommon: NULL pointer dereference when handling invalid a...

Status:	CLOSED NOTABUG

Aliases:	CVE-2018-15858

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	low Severity low
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Assigned To:	Red Hat Product Security
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Whiteboard:	impact=low,public=20180723,reported=2...
Keywords:	Security

Depends On:	1623038
Blocks:	1623044
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Reported:	2018-08-28 07:55 EDT by Andrej Nemec
Modified:	2018-10-26 06:24 EDT (History)
CC List:	3 users (show)

See Also:
Fixed In Version:	libxkbcommon 0.8.1
Doc Type:	If docs needed, set a value
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Last Closed:	2018-10-26 06:24:40 EDT
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Description Andrej Nemec 2018-08-28 07:55:16 EDT

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 06:24:40 EDT

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

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