Time and Order: Towards Automatically Identifying Side-Channel Vulnerabilities in Enclave Binaries


Wubing Wang, Yinqian Zhang, and Zhiqiang Lin, The Ohio State University


While Intel SGX provides confidentiality and integrity guarantees to programs running inside enclaves, side channels remain a primary concern of SGX security. Previous works have broadly considered the side-channel attacks against SGX enclaves at the levels of pages, caches, and branches, using a variety of attack vectors and techniques. Most of these studies have only exploited the "order" attribute of the memory access patterns (e.g., sequences of page accesses) as side channels. However, the other attribute of memory access patterns, “time”, which characterizes the interval between two specific memory accesses, is mostly unexplored. In this paper, we present ANABLEPS, a tool to automate the detection of side-channel vulnerabilities in enclave binaries, considering both order and time. ANABLEPS leverages concolic execution and fuzzing techniques to generate input sets for an arbitrary enclave program, constructing extended dynamic control-flow graph representation of execution traces using Intel PT, and automatically analyzing and identifying side-channel vulnerabilities using graph analysis.

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@inproceedings {242069,
author = {Wubing Wang and Yinqian Zhang and Zhiqiang Lin},
title = {Time and Order: Towards Automatically Identifying {Side-Channel} Vulnerabilities in Enclave Binaries},
booktitle = {22nd International Symposium on Research in Attacks, Intrusions and Defenses (RAID 2019)},
year = {2019},
isbn = {978-1-939133-07-6},
address = {Chaoyang District, Beijing},
pages = {443--457},
url = {https://www.usenix.org/conference/raid2019/presentation/wang-wubing},
publisher = {USENIX Association},
month = sep,