Title: opentmpfiles root privilege escalation via recursive chown
Author: Michael Orlitzky
The opentmpfiles program implements the tmpfiles.d specification for POSIX systems that do not run systemd. When processing a Z type entry, opentmpfiles calls chown recursively to change ownership of the target directory and its contents. An attacker can introduce a hard link into that directory pointing to a sensitive file, and the next time that opentmpfiles is run, ownership of the hard link's target will be given to the attacker.
Complete details here: http://michael.orlitzky.com/cves/cve-2017-18188.xhtml
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What is CVE?
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.
The process of creating a CVE Entry begins with the discovery of a potential security vulnerability. The MITRE Corporation currently maintains CVE and this public website, oversees the CNAs and CVE Board, and provides impartial technical guidance throughout the process to ensure CVE serves the public interest.
About Metro Data, Inc.
Founded in 1994, Metro Data, Inc. is a leading information systems & services firm that works exclusively with business clients to develop and apply customized technology solutions that accomplish a client's strategic goals.
Businesses have chosen Metro Data, Inc. to help keep pace with the ever-changing technology landscape. Metro Data, Inc.’s "end-to-end" experience helps their customers to secure their systems, reduce costs, and improve their business information systems performance.
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.