CVE Vulnerabilities

CVE-2011-0541

Improper Link Resolution Before File Access ('Link Following')

Published: Sep 02, 2011 | Modified: Nov 21, 2024
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
3.3 LOW
AV:L/AC:M/Au:N/C:N/I:P/A:P
RedHat/V2
2.6 LOW
AV:L/AC:H/Au:N/C:N/I:P/A:P
RedHat/V3
Ubuntu
MEDIUM

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.

Weakness

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

Affected Software

Name Vendor Start Version End Version
Fuse Fuse * 2.8.5 (including)
Fuse Fuse 1.9 (including) 1.9 (including)
Fuse Fuse 2.0-pre0 (including) 2.0-pre0 (including)
Fuse Fuse 2.0-pre1 (including) 2.0-pre1 (including)
Fuse Fuse 2.1 (including) 2.1 (including)
Fuse Fuse 2.2 (including) 2.2 (including)
Fuse Fuse 2.2.1 (including) 2.2.1 (including)
Fuse Fuse 2.3-pre (including) 2.3-pre (including)
Fuse Fuse 2.3-rc1 (including) 2.3-rc1 (including)
Fuse Fuse 2.3.0 (including) 2.3.0 (including)
Fuse Fuse 2.4.0 (including) 2.4.0 (including)
Fuse Fuse 2.4.1 (including) 2.4.1 (including)
Fuse Fuse 2.4.2 (including) 2.4.2 (including)
Fuse Fuse 2.5.0 (including) 2.5.0 (including)
Fuse Fuse 2.5.1 (including) 2.5.1 (including)
Fuse Fuse 2.5.2 (including) 2.5.2 (including)
Fuse Fuse 2.5.3 (including) 2.5.3 (including)
Fuse Fuse 2.6.0 (including) 2.6.0 (including)
Fuse Fuse 2.6.1 (including) 2.6.1 (including)
Fuse Fuse 2.6.3 (including) 2.6.3 (including)
Fuse Fuse 2.6.5 (including) 2.6.5 (including)
Fuse Fuse 2.7.0 (including) 2.7.0 (including)
Fuse Fuse 2.7.1 (including) 2.7.1 (including)
Fuse Fuse 2.7.2 (including) 2.7.2 (including)
Fuse Fuse 2.7.3 (including) 2.7.3 (including)
Fuse Fuse 2.7.4 (including) 2.7.4 (including)
Fuse Fuse 2.7.5 (including) 2.7.5 (including)
Fuse Fuse 2.7.6 (including) 2.7.6 (including)
Fuse Fuse 2.8.0 (including) 2.8.0 (including)
Fuse Fuse 2.8.1 (including) 2.8.1 (including)
Fuse Fuse 2.8.2 (including) 2.8.2 (including)
Fuse Fuse 2.8.3 (including) 2.8.3 (including)
Fuse Fuse 2.8.4 (including) 2.8.4 (including)
Red Hat Enterprise Linux 6 RedHat fuse-0:2.8.3-3.el6_1 *
Fuse Ubuntu dapper *
Fuse Ubuntu devel *
Fuse Ubuntu hardy *
Fuse Ubuntu karmic *
Fuse Ubuntu lucid *
Fuse Ubuntu maverick *

Potential Mitigations

  • Follow the principle of least privilege when assigning access rights to entities in a software system.
  • Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.

References