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                    Access Control: Android Provider

                    ABSTRACT

                    如果沒有適當的 access control,執行一個包含用戶控制主鍵的 SQLite 指令會允許攻擊者訪問未經授權的記錄。

                    EXPLANATION

                    在以下情況下,SQLite 查詢會發生 access control 錯誤:

                    1. 數據從一個不可信賴的數據源進入程序。


                    2. 這個數據用來指定 SQLite 查詢中主鍵的值。


                    例 1: 以下代碼用到一個參數化指令,這個指令轉義了元字符和防止 query string injection 漏洞,并構建和執行一個 SQLite 查詢,以搜索與用戶指定標識符相匹配的清單。


                    ...
                    id = this.getIntent().getExtras().getInt("id");
                    cursor = db.query(Uri.parse(invoices), columns, "id = ?", {id}, null, null, null);
                    ...


                    問題在于開發者沒有考慮到所有可能出現的 id 值。雖然查詢生成了一個當前用戶的標識符清單,但是攻擊者可以繞過這一行為,從而獲取所需的任意清單。因為此例中的代碼沒有確保用戶有權訪問需要的清單,所以代碼會顯示所有清單,即使這些清單并不屬于當前用戶。

                    REFERENCES

                    [1] Standards Mapping - OWASP Top 10 2004 - (OWASP 2004) A2 Broken Access Control

                    [2] Standards Mapping - OWASP Top 10 2007 - (OWASP 2007) A4 Insecure Direct Object Reference

                    [3] Standards Mapping - OWASP Top 10 2010 - (OWASP 2010) A4 Insecure Direct Object References

                    [4] Standards Mapping - FIPS200 - (FISMA) AC

                    [5] Android Developers-Reference:SQLite Database

                    [6] Standards Mapping - Security Technical Implementation Guide Version 3 - (STIG 3) APP3510 CAT I

                    [7] Standards Mapping - Security Technical Implementation Guide Version 3.4 - (STIG 3.4) APP3510 CAT I

                    [8] Standards Mapping - Common Weakness Enumeration - (CWE) CWE ID 566

                    [9] Standards Mapping - Web Application Security Consortium 24 + 2 - (WASC 24 + 2) Insufficient Authorization

                    [10] Standards Mapping - SANS Top 25 2011 - (SANS Top 25 2011) Porous Defenses - CWE ID 863

                    [11] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 - (PCI 1.1) Requirement 6.5.2

                    [12] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 - (PCI 1.2) Requirement 6.5.4

                    [13] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 - (PCI 2.0) Requirement 6.5.8

                    [14] S. J. Friedl SQL Injection Attacks by Example


                    Copyright 2013 Fortify Software - All rights reserved.
                    (Generated from version 2013.1.1.0008 of the Fortify Secure Coding Rulepacks)
                    desc.dataflow.java.access_control_android_provider

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