CROSSING Publications

LAZARUS: Practical Side-channel Resilient Kernel-Space Randomization

Author Orlando Arias, David Gens, Yier Jin, Christopher Liebchen, Ahmad-Reza Sadeghi, Dean Sullivan
Date September 2017
Kind Inproceedings
Book title20th International Symposium on Research in Attacks, Intrusions and Defenses (RAID 2017)
KeyTUD-CS-2017-0115
Research Areas S2, System Security Lab, CROSSING, ICRI-SC, CYSEC
Abstract Kernel exploits are most commonly used for privilege escalation to take full control over a system, e.g., by conducting a code-reuse attack. For this reason modern kernels are hardened with Kernel Address Space Layout Randomization (KASLR), which randomizes the start address of the kernel code section at boot time. Hence, the attacker first has to bypass the randomization, to conduct the attack using an adjusted payload in a second step. Recently, researchers demonstrated that attackers can use unprivileged instructions to access timing side channels through the paging subsystem of the processor. This can be exploited to reveal the randomization secret, even in the absence of any information-disclosure vulnerabilities in the software. In this paper we present LAZARUS, a novel technique to harden KASLR against paging-based side-channel attacks. In particular, our scheme allows for fine-grained protection of the virtual memory mappings that implement the randomization. We demonstrate the effectiveness of our approach by hardening a recent Linux kernel with LAZARUS, mitigating all of the previously presented side-channel attacks on KASLR. Our extensive evaluation shows that LAZARUS incurs only 0.943% overhead for standard benchmarks, and is therefore highly practical.
[Export this entry to BibTeX]

Important Copyright Notice:

The documents contained in these directories are included by the contributing authors as a means to ensure timely dissemination of scholarly and technical work on a non-commercial basis. Copyright and all rights therein are maintained by the authors or by other copyright holders, notwithstanding that they have offered their works here electronically. It is understood that all persons copying this information will adhere to the terms and constraints invoked by each author's copyright. These works may not be reposted without the explicit permission of the copyright holder.
A A A | Drucken Print | Impressum Impressum | Sitemap Sitemap | Kontakt Contact | Website Analysis: More Information
zum Seitenanfangzum Seitenanfang