CVE-2015-3202 - Mucid Pulls

Description

fusermount in FUSE before 2.9.3-15 does not properly clear the environment before invoking (1) mount or (2) umount as root which allows local users to write to arbitrary files via a crafted LIBMOUNT_MTAB environment variable that is used by mount’s debugging feature.

Reference

https://twitter.com/taviso/status/601370527437967360 http://www.securityfocus.com/bid/74765 https://gist.github.com/taviso/ecb70eb12d461dd85cba http://www.debian.org/security/2015/dsa-3266 http://www.openwall.com/lists/oss-security/2015/05/21/9 http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159831.html http://lists.fedoraproject.org/pipermail/package-announce/2015-June/160094.html http://packetstormsecurity.com/files/132021/Fuse-Local-Privilege-Escalation.html http://www.securitytracker.com/id/1032386 http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159543.html https://www.exploit-db.com/exploits/37089/ http://www.ubuntu.com/usn/USN-2617-3 https://security.gentoo.org/glsa/201603-04 http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159683.html http://www.ubuntu.com/usn/USN-2617-1 http://lists.fedoraproject.org/pipermail/package-announce/2015-June/160106.html http://lists.fedoraproject.org/pipermail/package-announce/2015-June/159298.html http://www.ubuntu.com/usn/USN-2617-2 http://www.debian.org/security/2015/dsa-3268 http://lists.opensuse.org/opensuse-updates/2015-06/msg00007.html http://lists.opensuse.org/opensuse-updates/2015-06/msg00005.html https://security.gentoo.org/glsa/201701-19