GLSA-201603-04 : FUSE: incorrect filtering of environment variables leading to privilege escalation

This script is Copyright (C) 2016 Tenable Network Security, Inc.


Synopsis :

The remote Gentoo host is missing one or more security-related
patches.

Description :

The remote host is affected by the vulnerability described in GLSA-201603-04
(FUSE: incorrect filtering of environment variables leading to privilege escalation)

The fusermount binary calls setuid(geteuid()) to reset the RUID when it
invokes /bin/mount so that it can use privileged mount options that are
normally restricted if RUID != EUID. FUSE does not properly clear
environment variables before invoking mount or umount as root allowing
this to be passed to operations using elevated privileges such as
LIBMOUNT_MTAB that is used by the mount commands debugging feature.

Impact :

The FUSE vulnerability allows a local, unprivileged user to overwrite
arbitrary files on the system.

Workaround :

There is no known work around at this time.

See also :

https://security.gentoo.org/glsa/201603-04

Solution :

All FUSE users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose '>=sys-fs/fuse-2.9.4'

Risk factor :

Low / CVSS Base Score : 3.6
(CVSS2#AV:L/AC:L/Au:N/C:N/I:P/A:P)
Public Exploit Available : true

Family: Gentoo Local Security Checks

Nessus Plugin ID: 89810 ()

Bugtraq ID:

CVE ID: CVE-2015-3202

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