CVE-2018-7169

Severity Score

5.3

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An issue was discovered in shadow 4.5. newgidmap (in shadow-utils) is setuid and allows an unprivileged user to be placed in a user namespace where setgroups(2) is permitted. This allows an attacker to remove themselves from a supplementary group, which may allow access to certain filesystem paths if the administrator has used "group blacklisting" (e.g., chmod g-rwx) to restrict access to paths. This flaw effectively reverts a security feature in the kernel (in particular, the /proc/self/setgroups knob) to prevent this sort of privilege escalation.

Se ha descubierto un problema en shadow 4.5. newgidmap (en shadow-utils) es setuid y permite que un usuario no privilegiado se coloque en un espacio de nombres de usuario en el que setgroups(2) está permitido. Esto permite que un atacante se autoelimine de un grupo suplementario, lo que podría permitir el acceso a ciertas rutas del sistema de archivos si el administrador ha empleado "listas negras de grupos" (por ejemplo, chmod g-rwx) para restringir el acceso a las rutas. Este error revierte de forma efectiva una característica de seguridad en el kernel (en particular, en el mando /proc/self/setgroups) para evitar este tipo de escalado de privilegios.

*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

2018-02-15 CVE Reserved
2018-02-15 CVE Published
2023-12-26 EPSS Updated
2024-08-05 CVE Updated
2024-08-05 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-732: Incorrect Permission Assignment for Critical Resource

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC
https://bugs.launchpad.net/ubuntu/+source/shadow/+bug/1729357	2024-08-05

URL	Date	SRC

URL	Date	SRC
https://security.gentoo.org/glsa/201805-09	2019-10-03

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Shadow Project Search vendor "Shadow Project"		Shadow Search vendor "Shadow Project" for product "Shadow"				4.5 Search vendor "Shadow Project" for product "Shadow" and version "4.5"		-		Affected