Title: GNU chown and chgrp privilege escalation via recursive dereferences
Author: Michael Orlitzky
The chown program in GNU coreutils is vulnerable to a race condition when using the POSIX -R -L options to follow symlinks recursively. In the presence of symlinks, the recursive directory traversal is not guaranteed to be performed depth-first. As a result, the “new owner” may be able to introduce a symlink at a point in the traversal that has yet to be reached. When it is reached, chown will be performed on the target of that symlink—a situation that is often exploitable to gain root privileges.
Complete details here: http://michael.orlitzky.com/cves/cve-2017-18018.xhtml
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Common Vulnerabilities and Exposures (CVE®) is a list of common identifiers for publicly known cybersecurity vulnerabilities, and is the industry standard for vulnerability and exposure identifiers.
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About the CVE Author, Michael J. Orlitzky
Mike has been with Metro Data, Inc. for over 20 years. He holds a PhD in Mathematics. He has been globally recognized for his work in discovering (and fixing) vulnerabilities in operating systems and application software. His research has been published in professional journals and he's been acknowledged by industry and academic peers for his work.