Key Management: Empty Encryption Key

ABSTRACT

Empty 加密密鑰會削弱系統安全，一旦出現安全問題將無法輕易修正。

EXPLANATION

為加密密鑰變量指定空字符串絕非一個好方法。最好不要為加密密鑰變量指定空字符串，因為攻擊者可以借此輕松泄露敏感信息和加密的信息。



例如：以下代碼可將加密密鑰變量初始化為空字符串。

...
$encrption_key = '';

$filter = new Zend_Filter_Encrypt($encrption_key);
 
$filter->setVector('myIV');
 
$encrypted = $filter->filter('text_to_be_encrypted');
print $encrypted;
...

REFERENCES

[1] Standards Mapping - OWASP Top 10 2010 - (OWASP 2010) A7 Insecure Cryptographic Storage

[2] Standards Mapping - OWASP Top 10 2007 - (OWASP 2007) A8 Insecure Cryptographic Storage

[3] Standards Mapping - OWASP Top 10 2004 - (OWASP 2004) A8 Insecure Storage

[4] Standards Mapping - Security Technical Implementation Guide Version 3 - (STIG 3) APP3210.1 CAT II, APP3340 CAT I, APP3350 CAT I

[5] Standards Mapping - Security Technical Implementation Guide Version 3.4 - (STIG 3.4) APP3210.1 CAT II, APP3340 CAT I, APP3350 CAT I

[6] Standards Mapping - Common Weakness Enumeration - (CWE) CWE ID 259

[7] Standards Mapping - FIPS200 - (FISMA) IA

[8] Standards Mapping - SANS Top 25 2009 - (SANS 2009) Porous Defenses - CWE ID 259

[9] Standards Mapping - Payment Card Industry Data Security Standard Version 1.2 - (PCI 1.2) Requirement 3.4, Requirement 6.3.1.3, Requirement 6.5.8, Requirement 8.4

[10] Standards Mapping - Payment Card Industry Data Security Standard Version 2.0 - (PCI 2.0) Requirement 3.4, Requirement 6.5.3, Requirement 8.4

[11] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1 - (PCI 1.1) Requirement 3.4, Requirement 6.5.8, Requirement 8.4