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CVE-2018-15859

Published: 25 August 2018

Unchecked NULL pointer usage when parsing invalid atoms in ExprResolveLhs in xkbcomp/expr.c in xkbcommon before 0.8.2 could be used by local attackers to crash (NULL pointer dereference) the xkbcommon parser by supplying a crafted keymap file, because lookup failures are mishandled.

Priority

Medium

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package Release Status
libxkbcommon
Launchpad, Ubuntu, Debian
upstream
Released (0.8.2-1)
xenial
Released (0.5.0-1ubuntu2.1)
bionic
Released (0.8.0-1ubuntu0.1)
cosmic Not vulnerable
(0.8.2-1)
trusty
Released (0.4.1-0ubuntu1.1)
Patches:
vendor: https://github.com/xkbcommon/libxkbcommon/commit/bb4909d2d8fa6b08155e449986a478101e2b2634

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