CVE-2018-19044

keepalived: Improper pathname validation allows for overwrite of arbitrary filenames via symlinks

Severity Score

4.7

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

keepalived 2.0.8 didn't check for pathnames with symlinks when writing data to a temporary file upon a call to PrintData or PrintStats. This allowed local users to overwrite arbitrary files if fs.protected_symlinks is set to 0, as demonstrated by a symlink from /tmp/keepalived.data or /tmp/keepalived.stats to /etc/passwd.

keepalived 2.0.8 no buscaba nombres de ruta con enlaces simbólicos al escribir datos en un archivo temporal al llamar a PrintData o PrintStats. Esto permitía a los usuarios locales sobrescribir archivos arbitrarios si fs.protected_symlinks se establece en 0, tal y como lo demuestra un enlace simbólico desde /tmp/keepalived.data o /tmp/keepalived.stats a /etc/passwd.

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2018-11-06 CVE Reserved
2018-11-08 CVE Published
2023-03-08 EPSS Updated
2024-08-05 CVE Updated
2024-08-05 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-59: Improper Link Resolution Before File Access ('Link Following')

CAPEC

References (7)

URL	Tag	Source
https://bugzilla.suse.com/show_bug.cgi?id=1015141	Issue Tracking

URL	Date	SRC
https://github.com/acassen/keepalived/issues/1048	2024-08-05

URL	Date	SRC
https://github.com/acassen/keepalived/commit/04f2d32871bb3b11d7dc024039952f2fe2750306	2019-08-06

URL	Date	SRC
https://access.redhat.com/errata/RHSA-2019:2285	2019-08-06
https://security.gentoo.org/glsa/201903-01	2019-08-06
https://access.redhat.com/security/cve/CVE-2018-19044	2019-08-06
https://bugzilla.redhat.com/show_bug.cgi?id=1651863	2019-08-06

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Keepalived Search vendor "Keepalived"		Keepalived Search vendor "Keepalived" for product "Keepalived"				2.0.8 Search vendor "Keepalived" for product "Keepalived" and version "2.0.8"		-		Affected