CVE-2011-0541

fuse: unprivileged user can unmount arbitrary locations via symlink attack

Severity Score

9.1

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

fuse 2.8.5 and earlier does not properly handle when /etc/mtab cannot be updated, which allows local users to unmount arbitrary directories via a symlink attack.

Fuse v2.8.5 y anteriores no se comporta de forma adecuada cuando /etc/mtlab no puede ser actualizado, lo que permite a usuarios locales desmontar directorios de su elección a través de un ataque de enlaces simbólicos.

FUSE can implement a fully functional file system in a user-space program. These packages provide the mount utility, fusermount, the tool used to mount FUSE file systems. Multiple flaws were found in the way fusermount handled the mounting and unmounting of directories when symbolic links were present. A local user in the fuse group could use these flaws to unmount file systems, which they would otherwise not be able to unmount and that were not mounted using FUSE, via a symbolic link attack.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Attack Vector

Local

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

Partial

Attack Vector

Local

Attack Complexity

High

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2011-01-20 CVE Reserved
2011-02-28 CVE Published
2024-08-06 CVE Updated
2025-05-03 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

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

CAPEC

References (7)

URL	Tag	Source
http://fuse.git.sourceforge.net/git/gitweb.cgi?p=fuse/fuse%3Ba=commit%3Bh=bf5ffb5fd8558bd799791834def431c0cee5a11f	X_refsource_confirm
http://www.openwall.com/lists/oss-security/2011/02/02/2	Mailing List

URL	Date	SRC

URL	Date	SRC
http://www.openwall.com/lists/oss-security/2011/02/03/5	2023-02-13
http://www.openwall.com/lists/oss-security/2011/02/08/4	2023-02-13

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2011-04/msg00000.html	2023-02-13
https://access.redhat.com/security/cve/CVE-2011-0541	2011-07-20
https://bugzilla.redhat.com/show_bug.cgi?id=651183	2011-07-20

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				<= 2.8.5 Search vendor "Fuse" for product "Fuse" and version " <= 2.8.5"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				1.9 Search vendor "Fuse" for product "Fuse" and version "1.9"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.0 Search vendor "Fuse" for product "Fuse" and version "2.0"		pre0		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.0 Search vendor "Fuse" for product "Fuse" and version "2.0"		pre1		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.1 Search vendor "Fuse" for product "Fuse" and version "2.1"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.2 Search vendor "Fuse" for product "Fuse" and version "2.2"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.2.1 Search vendor "Fuse" for product "Fuse" and version "2.2.1"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.3 Search vendor "Fuse" for product "Fuse" and version "2.3"		pre		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.3 Search vendor "Fuse" for product "Fuse" and version "2.3"		rc1		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.3.0 Search vendor "Fuse" for product "Fuse" and version "2.3.0"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.4.0 Search vendor "Fuse" for product "Fuse" and version "2.4.0"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.4.1 Search vendor "Fuse" for product "Fuse" and version "2.4.1"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.4.2 Search vendor "Fuse" for product "Fuse" and version "2.4.2"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.5.0 Search vendor "Fuse" for product "Fuse" and version "2.5.0"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.5.1 Search vendor "Fuse" for product "Fuse" and version "2.5.1"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.5.2 Search vendor "Fuse" for product "Fuse" and version "2.5.2"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.5.3 Search vendor "Fuse" for product "Fuse" and version "2.5.3"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.6.0 Search vendor "Fuse" for product "Fuse" and version "2.6.0"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.6.1 Search vendor "Fuse" for product "Fuse" and version "2.6.1"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.6.3 Search vendor "Fuse" for product "Fuse" and version "2.6.3"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.6.5 Search vendor "Fuse" for product "Fuse" and version "2.6.5"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.7.0 Search vendor "Fuse" for product "Fuse" and version "2.7.0"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.7.1 Search vendor "Fuse" for product "Fuse" and version "2.7.1"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.7.2 Search vendor "Fuse" for product "Fuse" and version "2.7.2"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.7.3 Search vendor "Fuse" for product "Fuse" and version "2.7.3"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.7.4 Search vendor "Fuse" for product "Fuse" and version "2.7.4"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.7.5 Search vendor "Fuse" for product "Fuse" and version "2.7.5"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.7.6 Search vendor "Fuse" for product "Fuse" and version "2.7.6"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.8.0 Search vendor "Fuse" for product "Fuse" and version "2.8.0"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.8.1 Search vendor "Fuse" for product "Fuse" and version "2.8.1"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.8.2 Search vendor "Fuse" for product "Fuse" and version "2.8.2"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.8.3 Search vendor "Fuse" for product "Fuse" and version "2.8.3"		-		Affected
Fuse Search vendor "Fuse"		Fuse Search vendor "Fuse" for product "Fuse"				2.8.4 Search vendor "Fuse" for product "Fuse" and version "2.8.4"		-		Affected