Bug 1623013 (CVE-2018-15855) - CVE-2018-15855 libxkbcommon: NULL pointer dereference when handling xkb_geometry
Summary: CVE-2018-15855 libxkbcommon: NULL pointer dereference when handling xkb_geometry
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2018-15855
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1623038 1643073
Blocks: 1623044
TreeView+ depends on / blocked
 
Reported: 2018-08-28 11:50 UTC by Andrej Nemec
Modified: 2019-09-29 14:57 UTC (History)
3 users (show)

Fixed In Version: libxkbcommon 0.8.1
Clone Of:
Environment:
Last Closed: 2019-08-06 19:19:26 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2019:2079 0 None None None 2019-08-06 12:11:13 UTC

Description Andrej Nemec 2018-08-28 11:50:56 UTC 
Unchecked NULL pointer usage 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, because the XkbFile for an xkb_geometry section was mishandled.

Upstream patch:

https://github.com/xkbcommon/libxkbcommon/commit/917636b1d0d70205a13f89062b95e3a0fc31d4ff

References:

https://lists.freedesktop.org/archives/wayland-devel/2018-August/039232.html
Comment 4 Riccardo Schirone 2018-10-25 14:09:22 UTC 
The parser implemented in parser.y returns NULL when a xkb_geometry FileType is parsed, but some parts of the code, like parser.y:parse(), do not handle NULL values, causing the application to crash.
Comment 5 errata-xmlrpc 2019-08-06 12:11:13 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2019:2079 https://access.redhat.com/errata/RHSA-2019:2079
Comment 6 Product Security DevOps Team 2019-08-06 19:19:26 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-2018-15855
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