CVE-2018-15862

libxkbcommon: NULL pointer dereference in LookupModMask resulting in a crash

Severity Score

5.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Unchecked NULL pointer usage in LookupModMask 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 with invalid virtual modifiers.

El uso de un puntero NULL no verificado en LookupModMask en xkbcomp/expr.c en xkbcommon, en versiones anteriores a la 0.8.2, podría ser aprovechado por atacantes locales para provocar el cierre inesperado (desreferencia de puntero NULL) del analizador xkbcommon proporcionando un archivo keymap manipulado con modificadores virtuales inválidos.

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2018-08-24 CVE Reserved
2018-08-25 CVE Published
2023-03-08 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-476: NULL Pointer Dereference

CAPEC

References (8)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://github.com/xkbcommon/libxkbcommon/commit/4e2ee9c3f6050d773f8bbe05bc0edb17f1ff8371	2019-08-06
https://lists.freedesktop.org/archives/wayland-devel/2018-August/039243.html	2019-08-06

URL	Date	SRC
https://access.redhat.com/errata/RHSA-2019:2079	2019-08-06
https://security.gentoo.org/glsa/201810-05	2019-08-06
https://usn.ubuntu.com/3786-1	2019-08-06
https://usn.ubuntu.com/3786-2	2019-08-06
https://access.redhat.com/security/cve/CVE-2018-15862	2019-08-06
https://bugzilla.redhat.com/show_bug.cgi?id=1623029	2019-08-06

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Xkbcommon Search vendor "Xkbcommon"		Libxkbcommon Search vendor "Xkbcommon" for product "Libxkbcommon"				<= 0.8.1 Search vendor "Xkbcommon" for product "Libxkbcommon" and version " <= 0.8.1"		-		Affected
Xkbcommon Search vendor "Xkbcommon"		Xkbcommon Search vendor "Xkbcommon" for product "Xkbcommon"				<= 0.8.1 Search vendor "Xkbcommon" for product "Xkbcommon" and version " <= 0.8.1"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				14.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "14.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				16.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "16.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				18.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "18.04"		lts		Affected