Thomas Biege has reported a vulnerability in FUSE, which potentially can be exploited by malicious, local users to perform certain actions on a vulnerable system with escalated privileges.
The vulnerability is caused due to "fusermount" failing to properly handle user supplied mountpoints that contain certain characters such as newline, tab, and backslash. This can be exploited to corrupt the "/etc/mtab" file and potentially allowing the attacker to set unauthorized mount options.
Successful exploitation requires that "fusermount" is suid root. This is the default on some Linux distributions.
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