PHP zend_strtod() denial of service

php-zendstrtod-dos (64470) The risk level is classified as MediumMedium Risk

Description:

PHP is vulnerable to a denial of service, caused by an error in the zend_strtod() function. A remote attacker could exploit this vulnerability to cause the application to hang.

*CVSS:

Base Score: 5
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Partial
 
Temporal Score: 4
  Exploitability: Unproven
  Remediation Level: Unavailable
  Report Confidence: Uncorroborated

Consequences:

Denial of Service

Remedy:

Apply the appropriate patch for your system. See References.

References:

  • The PHP Group Web site: PHP.
  • BID-45668: PHP 'zend_strtod()' Function Floating-Point Value Denial of Service Vulnerability
  • CVE-2010-4645: strtod.c, as used in the zend_strtod function in PHP 5.2 before 5.2.17 and 5.3 before 5.3.5, and other products, allows context-dependent attackers to cause a denial of service (infinite loop) via a certain floating-point value in scientific notation, which is not properly handled in x87 FPU registers, as demonstrated using 2.2250738585072011e-308.
  • OSVDB ID: 70370: PHP strtod.c zend_strtod Function x87 FPU Register DoS
  • RHSA-2011-0195: Moderate: php security update
  • RHSA-2011-0196: Moderate: php53 security update
  • SUSE-SR:2011:006: SUSE Security Summary Report
  • VUPEN/ADV-2011-0060: PHP Security Update Fixes Numeric Value Processing Denial of Service

Platforms Affected:

  • PHP PHP 5.3.3
  • RedHat Enterprise Linux 5
  • RedHat Enterprise Linux 5 Client Workstation
  • RedHat Enterprise Linux 6 Server
  • RedHat Enterprise Linux 6 Workstation
  • RedHat Enterprise Linux Desktop 6
  • RedHat Enterprise Linux EUS 5.6.z
  • RedHat Enterprise Linux HPC Node 6
  • RedHat Enterprise Linux Long Life 5.6
  • RedHat Enterprise Linux Server EUS 6.0.z

Reported:

Dec 30, 2010

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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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