CVE-2018-15861 : Unchecked NULL pointer usage in ExprResolveLhs in xkbcomp/expr.c in xkbcommon be

Unchecked NULL pointer usage 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 that triggers an xkb_intern_atom failure.

Published 2018-08-25 21:29:02

Updated 2019-08-06 17:15:26

Source MITRE

View at NVD, CVE.org

Vulnerability category: Memory Corruption

Products affected by CVE-2018-15861

Canonical » Ubuntu Linux » Version: 14.04 LTS Edition
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
Matching versions
Canonical » Ubuntu Linux » Version: 16.04 LTS Edition
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
Matching versions
Canonical » Ubuntu Linux » Version: 18.04 LTS Edition
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
Matching versions
Xkbcommon » Libxkbcommon
Versions up to, including, (<=) 0.8.1
cpe:2.3:a:xkbcommon:libxkbcommon:*:*:*:*:*:*:*:*
Matching versions
Xkbcommon » Xkbcommon
Versions up to, including, (<=) 0.8.1
cpe:2.3:a:xkbcommon:xkbcommon:*:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2018-15861

EPSS FAQ

0.04%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 6 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2018-15861

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
2.1	LOW	AV:L/AC:L/Au:N/C:N/I:N/A:P	3.9	2.9	NIST
Access Vector: Local Access Complexity: Low Authentication: None Confidentiality Impact: None Integrity Impact: None Availability Impact: Partial
5.5	MEDIUM	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	1.8	3.6	NIST
Attack Vector: Local Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2018-15861

CWE-476 NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2018-15861

https://usn.ubuntu.com/3786-1/

USN-3786-1: libxkbcommon vulnerabilities | Ubuntu security notices
Third Party Advisory

CVEs referencing this url
https://lists.freedesktop.org/archives/wayland-devel/2018-August/039243.html

[ANNOUNCE] libxkbcommon 0.8.2
Mailing List;Patch;Third Party Advisory

CVEs referencing this url
https://security.gentoo.org/glsa/201810-05

xkbcommon: Multiple vulnerabilities (GLSA 201810-05) — Gentoo security
Third Party Advisory

CVEs referencing this url
https://access.redhat.com/errata/RHSA-2019:2079

RHSA-2019:2079 - Security Advisory - Red Hat Customer Portal

CVEs referencing this url
https://github.com/xkbcommon/libxkbcommon/commit/38e1766bc6e20108948aec8a0b222a4bad0254e9

xkbcomp: Don't falsely promise from ExprResolveLhs · xkbcommon/libxkbcommon@38e1766 · GitHub
Patch;Third Party Advisory
https://usn.ubuntu.com/3786-2/

USN-3786-2: libxkbcommon vulnerabilities | Ubuntu security notices
Third Party Advisory

CVEs referencing this url

Jump to

Vulnerability Details : CVE-2018-15861

Products affected by CVE-2018-15861

Exploit prediction scoring system (EPSS) score for CVE-2018-15861

CVSS scores for CVE-2018-15861

CWE ids for CVE-2018-15861

References for CVE-2018-15861