CVE-2010-2020

FreeBSD - 'mountnfs()' Denial of Service

Severity Score

7.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

sys/nfsclient/nfs_vfsops.c in the NFS client in the kernel in FreeBSD 7.2 through 8.1-PRERELEASE, when vfs.usermount is enabled, does not validate the length of a certain fhsize parameter, which allows local users to gain privileges via a crafted mount request.

sys/nfsclient/nfs_vfsops.c en el cliente NFS en el kernel en FreeBSD v7.2 hasta v8.1-PRERELEASE, cuando vfs.usermount está habilitado no valida la longitud de ciertos parámetros fhsize, lo que permite a usuarios locales obtener privilegios a través de una petición mount manipulada.

Census Labs have discovered two improper input validation vulnerabilities in the FreeBSD kernel's NFS client-side implementation (FreeBSD 8.0-RELEASE, 7.3-RELEASE and 7.2-RELEASE) that allow local unprivileged users to escalate their privileges, or to crash the system by performing a denial of service attack.

*Credits: N/A

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

Medium

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2010-05-24 CVE Reserved
2010-05-28 CVE Published
2010-05-28 First Exploit
2024-08-07 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-20: Improper Input Validation

CAPEC

References (7)

URL	Tag	Source
http://securitytracker.com/id?1024039	Vdb Entry

URL	Date	SRC
https://packetstorm.news/files/id/90052	2010-05-28
https://www.exploit-db.com/exploits/14003	2010-06-24
https://www.exploit-db.com/exploits/14002	2017-11-16
http://www.exploit-db.com/exploits/14002	2024-08-07
http://www.exploit-db.com/exploits/14003	2024-08-07

URL	Date	SRC

URL	Date	SRC
http://security.FreeBSD.org/advisories/FreeBSD-SA-10:06.nfsclient.asc	2012-11-06

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				7.2 Search vendor "Freebsd" for product "Freebsd" and version "7.2"		-		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				7.2 Search vendor "Freebsd" for product "Freebsd" and version "7.2"		pre-release		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				7.2 Search vendor "Freebsd" for product "Freebsd" and version "7.2"		stable		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				8.0 Search vendor "Freebsd" for product "Freebsd" and version "8.0"		-		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				8.1-prerelease Search vendor "Freebsd" for product "Freebsd" and version "8.1-prerelease"		-		Affected