Samba can be configured to allow any user with write access the ability to create a link to the root filesystem. Once an attacker has this level of access, it’s only a matter of time before the system gets owned. Although this configuration isn’t that common in the wild, it does happen, and Metasploit has a module to easily exploit this security flaw.

Symbolic links, or symlinks, are files that link to other files or directories on a system, and they are an essential part of the Linux environment. Symlinks are often used to connect libraries and redirect certain binaries to other versions… more

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