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CVE-2011-0543

Status Candidate

Overview

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.

Related Files

Red Hat Security Advisory 2011-1083-01
Posted Jul 21, 2011
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2011-1083-01 - FUSE can implement a fully functional file system in a user-space program. These packages provide the mount utility, fusermount, the tool used to mount FUSE file systems. Multiple flaws were found in the way fusermount handled the mounting and unmounting of directories when symbolic links were present. A local user in the fuse group could use these flaws to unmount file systems, which they would otherwise not be able to unmount and that were not mounted using FUSE, via a symbolic link attack.

tags | advisory, local
systems | linux, redhat
advisories | CVE-2010-3879, CVE-2011-0541, CVE-2011-0542, CVE-2011-0543
SHA-256 | 570a3ac9c4d8ba47567744f3a2508ef5c64019b15a6120d40f7b53ce18ed1cd0
Ubuntu Security Notice USN-1077-1
Posted Feb 28, 2011
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1077-1 - It was discovered that FUSE would incorrectly follow symlinks when checking mountpoints under certain conditions. A local attacker, with access to use FUSE, could unmount arbitrary locations, leading to a denial of service.

tags | advisory, denial of service, arbitrary, local
systems | linux, ubuntu
advisories | CVE-2009-3297, CVE-2011-0541, CVE-2011-0542, CVE-2011-0543
SHA-256 | 7abc581d95fd6fa91f14b15d1919d17c1f65a3f627fcc6b20f76aa12c42d3cce
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