GLSA-201603-04 : FUSE: incorrect filtering of environment variables leading to privilege escalation
Low Nessus Plugin ID 89810
SynopsisThe remote Gentoo host is missing one or more security-related patches.
DescriptionThe 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.
The FUSE vulnerability allows a local, unprivileged user to overwrite arbitrary files on the system.
There is no known work around at this time.
SolutionAll FUSE users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose '>=sys-fs/fuse-2.9.4'