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CVE-2018-15858

Published: 25 August 2018

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.

Notes

AuthorNote
leosilva
code in trusty is quite different.
portions of the code affected are not present so
changing to not-affected.

Priority

Medium

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package Release Status
libxkbcommon
Launchpad, Ubuntu, Debian
upstream
Released (0.8.2-1)
trusty Does not exist
(trusty was not-affected)
xenial
Released (0.5.0-1ubuntu2.1)
bionic
Released (0.8.0-1ubuntu0.1)
cosmic Not vulnerable
(0.8.2-1)
Patches:
vendor: https://github.com/xkbcommon/libxkbcommon/commit/badb428e63387140720f22486b3acbd3d738859f

Severity score breakdown

Parameter Value
Base score 5.5
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H