CVE-2018-18586

Gentoo Linux Security Advisory 201903-20

Severity Score

5.3

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

chmextract.c in the chmextract sample program, as distributed with libmspack before 0.8alpha, does not protect against absolute/relative pathnames in CHM files, leading to Directory Traversal. NOTE: the vendor disputes that this is a libmspack vulnerability, because chmextract.c was only intended as a source-code example, not a supported application

** EN DISPUTA ** chmextract.c en el programa de muestra chmextract, tal y como se distribuye en libmspack en versiones anteriores a la 0.8alpha, no protege contra nombres de ruta absoluta/relativa en archivos CHM, lo que conduce a un salto de directorio. NOTA: el fabricante discute que esto sea una vulnerabilidad en libmspack, ya que chmextract.c solo se diseñó como ejemplo de código abierto, no una aplicación soportada.

An update that fixes one vulnerability is now available. This update for libmspack fixes the following issues. Fixed directory traversal in chmextract by adding anti "../" and leading slash protection.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2018-10-22 CVE Reserved
2018-10-23 CVE Published
2024-08-05 CVE Updated
2024-08-05 First Exploit
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CAPEC

References (4)

URL	Tag	Source
https://bugs.debian.org/911639	Mailing List
https://www.openwall.com/lists/oss-security/2018/10/22/1	Mailing List

URL	Date	SRC
https://github.com/kyz/libmspack/commit/7cadd489698be117c47efcadd742651594429e6d	2024-08-05

URL	Date	SRC

URL	Date	SRC
https://security.gentoo.org/glsa/201903-20	2024-05-17

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Kyzer Search vendor "Kyzer"		Libmspack Search vendor "Kyzer" for product "Libmspack"				0.3 Search vendor "Kyzer" for product "Libmspack" and version "0.3"		alpha		Affected
Kyzer Search vendor "Kyzer"		Libmspack Search vendor "Kyzer" for product "Libmspack"				0.4 Search vendor "Kyzer" for product "Libmspack" and version "0.4"		alpha		Affected
Kyzer Search vendor "Kyzer"		Libmspack Search vendor "Kyzer" for product "Libmspack"				0.5 Search vendor "Kyzer" for product "Libmspack" and version "0.5"		alpha		Affected
Kyzer Search vendor "Kyzer"		Libmspack Search vendor "Kyzer" for product "Libmspack"				0.6 Search vendor "Kyzer" for product "Libmspack" and version "0.6"		alpha		Affected
Kyzer Search vendor "Kyzer"		Libmspack Search vendor "Kyzer" for product "Libmspack"				0.7 Search vendor "Kyzer" for product "Libmspack" and version "0.7"		alpha		Affected