Libra: A Compatible Method for Defending Against Arbitrary Memory Overwrite

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黃建瑋(Chi-Wei Huang) 查詢紙本館藏

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資訊工程學系

論文名稱

(Libra: A Compatible Method for Defending Against Arbitrary Memory Overwrite)

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摘要(中)

Linux Kernel 的弱點數目在2013年達到高峰，更勝過去自1991年以來的弱點數目。本篇論文關注於Privilege Escalation攻擊類型中任意寫入memory的防禦方式。

為了防止惡意的User拿到Root權限。最簡單的方法，當然就是把內核中的敏感資料結構設為唯讀。但是我們不確定未來內核是否有需要須改這些敏感的資料結構，所以我們在唯讀與可寫中取一個折衷的方法。

本論文所談論到的方法不僅僅，可以使用在以上的問題，更可以推廣到系統中有某一重要記憶體值，需要在某一安全範圍內更改，而不能只是單純的設定為唯讀。

摘要(英)

There have been more vulnerabilities in the Linux Kernel in 2013 than there had been in the previous decade. In this paper, the research was focused on defending against arbitrary memory overwrites in Privilege Escalation.

To avoid malicious users getting root authority. The easiest way is to set the sensitive data structure to read-only. But we are not sure the sensitive data structure will never be modified by legal behavior from a normal device driver; thus, we posed a compatible solution between read-only solutions and writable solutions to enhance compatibility.

The main idea that we posed not only solves the above problem, but also the general problem which is ensuring that important memory values can only be changed within a safe range.

It is not just set to read-only.

關鍵字(中)

★ Linux Kernel Vulnerabilities
★ Exploit
★ Privilege Escalation

關鍵字(英)

★ Linux Kernel Vulnerabilities
★ Exploit
★ Privilege Escalation

論文目次

Abstract iii
誌謝 iv
Contents v
List of Figures vii
List of Tables viii
Chapter 1 Introduction 1
1.1 Statistics of Vulnerabilities and Exploits 3
1.2 Attack Principle 5
Chapter 2 Mechanisms of Attack and Analysis 8
2.1 At the Second Step 8
2.2 Kernel Data Structures to Overwrite 9
Chapter 3 Related Work 10
3.1 Attacks Research 10
3.2 Defense Research 12
Chapter 4 Proposed Solution: Libra 13
4.1 Protection through Paging in x86 architecture 13
4.2 Background of the Page Fault Handler in Linux 14
4.3 A Case Study in CVE-2013-2094 with Read-only patch 15
4.4 Check the Compatibility 17
4.5 System Design 18
Chapter 5 Implementation 23
Chapter 6 Evaluation 25
6.1 Compatible Comparison 25
6.2 Performance 29
Chapter 7 Conclusion and Future Work 31
7.1 Conclusion 31
7.2 Future Work 32
REFERENCE 33
APPENDIX A : Linux Memory Layout 37
APPENDIX B : A Case Study : CVE-2013-2094 38
B.1 In perf_swevent_init 39
B.2 In sw_perf_event_destroy 40
B.3 Attacks Layout 40
APPENDIX C : A Case Study : CVE-2013-2094 on x86 41
C.1 Modify the ptmx_fops 41
C.2 Attacks layout 41

參考文獻

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no_context
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指導教授

許富皓(Fu-Hau Hsu)

審核日期

2014-7-31

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