September 14-15, 2017 - Los Angeles, CA
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Friday, September 15 • 1:40pm - 2:25pm
Proposal of a Method to Prevent Privilege Escalation Attacks for Linux Kernel - Yuichi Nakamura, Hitachi,Ltd & Toshihiro Yamauchi, Okayama University

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In many Linux kernel exploits, attackers aim to escalate privilege (obtain uid=0) via vulnerabilities of system calls. In this presentation, we propose a method to prevent privilege escalation attacks. The basic design, implementation, evaluation results and limitations are discussed.

Our method focusses on the feature that privileges of process is changed only in particular system call processing, and monitors the changes of privileges by each system call to prevent privilege escalation attacks. The watched privileges include not only those related to DAC(such as uid), but also includes important valuables of MAC system such as SELinux (e.g: selinux_enforcing). The method is implemented as a patch for Linux kernel and evaluated. It is found that privilege escalation can be prevented in real vulnerabilities, and the performance overhead is pretty small.

avatar for Yuichi Nakamura

Yuichi Nakamura

Director, Hitachi
Yuichi Nakamura,Ph.D works for Hitachi,Ltd. He has been engaged with OSS over 20 years, gave presentations in many OSS events such as Linux Security Summit and Embedded Linux Conference, is a board of the Linux Foundation. He launched API management solution using Keycloak, and his... Read More →

Toshihiro Yamauchi

Associate Professor, Okayama University
Toshihiro Yamauchi is an associate professor at Okayama University. His research interests include operating systems and computer security.

Friday September 15, 2017 1:40pm - 2:25pm PDT
Gold 4