Insecure SSL: Android Hostname Verification Disabled

ABSTRACT

當進行 SSL 連接時，主機名驗證功能被禁用。

EXPLANATION

采用 SSL 連接時，使用 AllowAllHostnameVerifier() 或 SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER 會完全關閉主機名驗證功能。這相當于信任所有證書。

例 1：應用程序設置以下主機名驗證程序。

... 
SSLSocketFactory sf = new CustomSSLSocketFactory(trustStore);
sf.setHostnameVerifier(SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
...

當試著連接 https://safesecureserver.banking.com 時，該應用程序會隨時接受給 https://hackedserver.banking.com 簽發的證書。此時，當服務器被黑客攻擊發生 SSL 連接中斷時，應用程序可能會泄漏用戶敏感信息。

REFERENCES

[1] Standards Mapping - OWASP Top 10 2004 - (OWASP 2004) A3 Broken Authentication and Session Management

[2] Standards Mapping - OWASP Top 10 2007 - (OWASP 2007) A9 Insecure Communications

[3] Standards Mapping - OWASP Top 10 2010 - (OWASP 2010) A9 Insufficient Transport Layer Protection

[4] Standards Mapping - Security Technical Implementation Guide Version 3 - (STIG 3) APP3250.1 CAT I, APP3250.2 CAT I, APP3250.3 CAT II, APP3250.4 CAT II

[5] Standards Mapping - Security Technical Implementation Guide Version 3.4 - (STIG 3.4) APP3250.1 CAT I, APP3250.2 CAT I, APP3250.3 CAT II, APP3250.4 CAT II

[6] Standards Mapping - FIPS200 - (FISMA) CM, SC

[7] Standards Mapping - Common Weakness Enumeration - (CWE) CWE ID 297

[8] Designing for Security Android

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

[10] OWASP Top 10 Mobile Risks OWASP

[11] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 - (PCI 1.2) Requirement 4.1, Requirement 6.3.1.4, Requirement 6.5.9

[12] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 - (PCI 1.1) Requirement 4.1, Requirement 6.5.10

[13] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 - (PCI 2.0) Requirement 4.1, Requirement 6.5.4

[14] S. Fahl, M. Harbach, T. Muders, M. Smith, L. Baumgartner, B. Friesleben Why Eve and Mallory Love Android:An Analysis of Android SSL (In)Security

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