Vulnerability identifier: #VU44759

Vulnerability risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2011-0543

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Fuse
Server applications / Application servers

Vendor: Red Hat Inc.

Description

The vulnerability allows a remote non-authenticated attacker to manipulate or delete data.

Certain legacy functionality in fusermount in fuse 2.8.5 and earlier, when util-linux does not support the --no-canonicalize option, allows local users to bypass intended access restrictions and unmount arbitrary directories via a symlink attack.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Fuse: 1.9 - 2.8.4

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External links
http://fuse.git.sourceforge.net/git/gitweb.cgi?p=fuse/fuse;a=commit;h=cbd3a2a84068aae6e3fe32939d88470d712dbf47
http://lists.opensuse.org/opensuse-security-announce/2011-04/msg00000.html
http://www.openwall.com/lists/oss-security/2011/02/02/2
http://www.openwall.com/lists/oss-security/2011/02/03/5
http://www.openwall.com/lists/oss-security/2011/02/08/4

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.