CVE-2018-18586 : chmextract.c in the chmextract sample program, as distributed with libmspack before 0.8alpha, does not protect against a

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

Published 2018-10-23 02:29:01

Updated 2024-08-05 12:15:18

Source MITRE

View at NVD, CVE.org

Vulnerability category: Directory traversal

Products affected by CVE-2018-18586

Kyzer » Libmspack » Version: 0.3 Update Alpha
cpe:2.3:a:kyzer:libmspack:0.3:alpha:*:*:*:*:*:*
Matching versions
Kyzer » Libmspack » Version: 0.7 Update Alpha
cpe:2.3:a:kyzer:libmspack:0.7:alpha:*:*:*:*:*:*
Matching versions
Kyzer » Libmspack » Version: 0.6 Update Alpha
cpe:2.3:a:kyzer:libmspack:0.6:alpha:*:*:*:*:*:*
Matching versions
Kyzer » Libmspack » Version: 0.5 Update Alpha
cpe:2.3:a:kyzer:libmspack:0.5:alpha:*:*:*:*:*:*
Matching versions
Kyzer » Libmspack » Version: 0.4 Update Alpha
cpe:2.3:a:kyzer:libmspack:0.4:alpha:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2018-18586

EPSS FAQ

0.13%

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

~ 49 %

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

CVSS scores for CVE-2018-18586

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
5.0	MEDIUM	AV:N/AC:L/Au:N/C:P/I:N/A:N	10.0	2.9	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: Partial Integrity Impact: None Availability Impact: None
5.3	MEDIUM	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N	3.9	1.4	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: Low Integrity: None Availability: None

CWE ids for CVE-2018-18586

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

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2018-18586

https://security.gentoo.org/glsa/201903-20

cabextract, libmspack: Multiple vulnerabilities (GLSA 201903-20) — Gentoo security
Third Party Advisory

CVEs referencing this url
https://github.com/kyz/libmspack/commit/7cadd489698be117c47efcadd742651594429e6d

add anti "../" and leading slash protection to chmextract · kyz/libmspack@7cadd48 · GitHub
Exploit;Vendor Advisory
https://bugs.debian.org/911639

#911639 - libmspack: CVE-2018-18586: add anti "../" and leading slash protection to chmextract - Debian Bug report logs
Mailing List;Third Party Advisory
https://www.openwall.com/lists/oss-security/2018/10/22/1

oss-security - Buffer overflow in cabextract/libmspack (Fwd: New cabextract 1.8 and libmspack 0.8 release)
Mailing List;Third Party Advisory

CVEs referencing this url

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Vulnerability Details : CVE-2018-18586

Products affected by CVE-2018-18586

Exploit prediction scoring system (EPSS) score for CVE-2018-18586

CVSS scores for CVE-2018-18586

CWE ids for CVE-2018-18586

References for CVE-2018-18586