CVE-2018-15857

libxkbcommon: Invalid free in ExprAppendMultiKeysymList resulting in a crash

Severity Score

7.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An invalid free in ExprAppendMultiKeysymList in xkbcomp/ast-build.c in xkbcommon before 0.8.1 could be used by local attackers to crash xkbcommon keymap parsers or possibly have unspecified other impact by supplying a crafted keymap file.

Una liberación no válida en ExprAppendMultiKeysymList en xkbcomp/ast-build.c en xkbcommon, en versiones anteriores a la 0.8.1, podría ser empleada por atacantes locales para provocar el cierre inesperado de los analizadores keymap de xkbcommon o, posiblemente, lograr otro tipo de impacto sin especificar proporcionando un archivo keymap manipulado.

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

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-416: Use After Free

CAPEC

References (8)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://github.com/xkbcommon/libxkbcommon/commit/c1e5ac16e77a21f87bdf3bc4dea61b037a17dddb	2019-08-06
https://lists.freedesktop.org/archives/wayland-devel/2018-August/039232.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-2018-15857	2019-08-06
https://bugzilla.redhat.com/show_bug.cgi?id=1623022	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