PHP rand and mt_rand function weak security

php-rand-mtrand-weak-security (45956) The risk level is classified as LowLow Risk

Description:

PHP could provide weaker than expected security. The rand and mt_rand functions do not produce cryptographically strong random numbers. A remote attacker could exploit this vulnerability to launch further attacks against affected applications.

*CVSS:

Base Score: 4.3
  Access Vector: Network
  Access Complexity: Medium
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: Partial
  Availability Impact: None
 
Temporal Score: 3.2
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Other

Remedy:

Apply the appropriate patch for your system. See References.

References:

  • Joomla! Web site: Joomla!.
  • PHP Web site: PHP: Downloads.
  • SektionEins Security Advisory, 2008/09/11: Joomla Weak Random Password Reset Token Vulnerability .
  • Suspekt Blog Archive, August 17th, 2008: mt_srand and not so random numbers.
  • BID-31115: WordPress Random Password Generation Insufficient Entropy Weakness
  • CVE-2008-4107: The (1) rand and (2) mt_rand functions in PHP 5.2.6 do not produce cryptographically strong random numbers, which allows attackers to leverage exposures in products that rely on these functions for security-relevant functionality, as demonstrated by the password-reset functionality in Joomla! 1.5.x and WordPress before 2.6.2, a different vulnerability than CVE-2008-2107, CVE-2008-2108, and CVE-2008-4102.
  • OSVDB ID: 48022: WordPress Registration SQL Truncation Administrator Password Manipulation
  • OSVDB ID: 48700: WordPress mt_rand() Function RNG Weakness
  • SA31737: WordPress Insecure Password Generation Vulnerability
  • SECTRACK ID: 1020869: WordPress SQL Truncation and Password Generation Flaw Lets Remote Users Determine the Administrator's Password

Platforms Affected:

  • PHP PHP 5.2.6

Reported:

Sep 11, 2008

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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