CVE-2018-15859

libxkbcommon: NULL pointer dereference when parsing invalid atoms in ExprResolveLhs 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 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.

El uso de un puntero NULL no verificado al analizar átomos no válidos en ExprResolveLhs 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, debido a que se gestionan incorrectamente los errores de búsqueda.

*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/bb4909d2d8fa6b08155e449986a478101e2b2634	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-2018-15859	2019-08-06
https://bugzilla.redhat.com/show_bug.cgi?id=1623026	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