Title: FUSE Mount Options Corruption Vulnerability
Severity: MODERATE
Description:
The FUSE (Filesystem in Userspace) project is an open-source Linux kernel module designed to allow users to create and run filesystems from userspace, without superuser privileges.
FUSE is prone to a vulnerability that could change or corrupt current mount options.
The problem is due to a failure in 'fusermount' to handle special characters in mount points. An attacker could exploit this issue to corrupt or add new entries to '/etc/mtab'.
Successful exploitation could result in a denial of service if mount options become unusable. An attacker can also exploit this issue to add arbitrary mount points that could grant the attacker read access (and possibly write access) to otherwise restricted or privileged mount points. Other attacks are also possible.
Affected Products:
- Debian Linux 3.1.0
- Debian Linux 3.1.0 alpha
- Debian Linux 3.1.0 amd64
- Debian Linux 3.1.0 arm
- Debian Linux 3.1.0 hppa
- Debian Linux 3.1.0 ia-32
- Debian Linux 3.1.0 ia-64
- Debian Linux 3.1.0 m68k
- Debian Linux 3.1.0 mips
- Debian Linux 3.1.0 mipsel
- Debian Linux 3.1.0 ppc
- Debian Linux 3.1.0 s/390
- Debian Linux 3.1.0 sparc
- Gentoo Linux
- MandrakeSoft Linux Mandrake 2006.0.0
- MandrakeSoft Linux Mandrake 2006.0.0 x86_64
- Miklos Szeredi FUSE 2.2.0
- Miklos Szeredi FUSE 2.2.1
- Miklos Szeredi FUSE 2.3.0 -rc1
- Miklos Szeredi FUSE 2.3.0 .0
- Miklos Szeredi FUSE 2.4.0 .0
References:
- Gentoo: Bugzilla Bug 112902 - sys-fs/fuse: fusermount can corrupt /etc/mtab
- Miklos Szeredi: FUSE Home Page
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