Joomla! random numbers information disclosure

joomla-randomnumbers-info-disclosure (45068) The risk level is classified as LowLow Risk


Joomla! could allow a remote attacker to obtain sensitive information, caused by the use of a weak seed to initialize the pseudorandom number generator (PRNG). A remote attacker could exploit this vulnerability using brute force techniques to discover passwords or guess a password reset token.


Base Score: 5
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: Partial
  Integrity Impact: None
  Availability Impact: None
Temporal Score: 3.7
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed


Obtain Information


Upgrade to the latest version of Joomla! (1.5.7 or later), available from the Joomla! Web site. See References.


  • Joomla! Security Announcements - Tuesday, 09 September 2008 16:09: [20080902] - Core - Random Number Generation Flaw.
  • Joomla! Web site: Joomla 1.5.7 Security Release Now Available.
  • CVE-2008-4102: Joomla! 1.5 before 1.5.7 initializes PHP's PRNG with a weak seed, which makes it easier for attackers to guess the pseudo-random values produced by PHP's mt_rand function, as demonstrated by guessing password reset tokens, a different vulnerability than CVE-2008-3681.
  • SA31789: Joomla! Multiple Vulnerabilities

Platforms Affected:

  • Joomla Joomla! 1.5.0
  • Joomla! Joomla! 1.5.1
  • Joomla! Joomla! 1.5.2
  • Joomla! Joomla! 1.5.3
  • Joomla! Joomla! 1.5.4
  • Joomla! Joomla! 1.5.5
  • Joomla! Joomla! 1.5.6


Sep 09, 2008

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