Multiple vulnerabilities have been found in FUSE, the worst of which can lead to code execution.
| Package | Arch | Vulnerable | Unaffected |
|---|---|---|---|
| sys-fs/fuse | * | < 3.18.1:3 | >= 3.18.1:3 |
FUSE (Filesystem in Userspace) is an interface for userspace programs to export a filesystem to the Linux kernel.
The following vulnerabilities have been discovered in FUSE: a NULL pointer dereference (when running with the NUMA architecture) and a use-after-free. The worst of which can lead to code execution. Please review the CVE identifiers referenced below for details.
The following is a possible outcome: denial of service (crash) and potential code execution.
There is no known workaround at this time.
All FUSE users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=sys-fs/fuse-3.18.1:3"
The fusermount binary in FUSE does not properly clear the environment before invoking mount or umount as root that allows a local user to overwrite arbitrary files.
| Package | Arch | Vulnerable | Unaffected |
|---|---|---|---|
| sys-fs/fuse | * | < 2.9.4 | >= 2.9.4 |
FUSE provides an interface for filesystems implemented in userspace.
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.
All FUSE users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=sys-fs/fuse-2.9.4"
The fusermount utility from FUSE can be abused to corrupt the /etc/mtab file contents, potentially allowing a local attacker to set unauthorized mount options.
| Package | Arch | Vulnerable | Unaffected |
|---|---|---|---|
| sys-fs/fuse | * | < 2.4.1-r1 | >= 2.4.1-r1 |
FUSE (Filesystem in Userspace) allows implementation of a fully functional filesystem in a userspace program. The fusermount utility is used to mount/unmount FUSE file systems.
Thomas Biege discovered that fusermount fails to securely handle special characters specified in mount points.
A local attacker could corrupt the contents of the /etc/mtab file by mounting over a maliciously-named directory using fusermount, potentially allowing the attacker to set unauthorized mount options. This is possible only if fusermount is installed setuid root, which is the default in Gentoo.
There is no known workaround at this time.
All FUSE users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=sys-fs/fuse-2.4.1-r1"