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             AUSCERT External Security Bulletin Redistribution

                               ESB-2011.0199
                 PHP grapheme_extract() denial of service
                             21 February 2011

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           PHP 5.3.5
Publisher:         ISS
Operating System:  UNIX variants (UNIX, Linux, OSX)
                   Windows
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2011-0420  

Original Bulletin: 
   http://xforce.iss.net/xforce/xfdb/65437

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PHP grapheme_extract() denial of service
php-graphemeextract-dos (65437) 	
The risk level is classified as Low Risk

Description:

PHP is vulnerable to a denial of service, caused by a NULL pointer dereference 
in the grapheme_extract() function. An attacker can exploit this vulnerability 
to cause a denial of service.

*CVSS:
  Base Score: 			5
  Access Vector: 		Network
  Access Complexity: 		Low
  Authentication: 		None
  Confidentiality Impact: 	None
  Integrity Impact: 		None
  Availability Impact: 		Partial
 
  Temporal Score: 		3.9
  Exploitability: 		Proof-of-Concept
  Remediation Level: 		Official-Fix
  Report Confidence: 		Confirmed

Consequences:

Denial of Service

Remedy:

Apply the patch for this vulnerability, available from the PHP SVN Repository. 
See References.

References:

    * PHP SVN Repository: PHP.
    * SecurityReason SecurityAlert : 8087: PHP 5.3.5 grapheme_extract() NULL 
      Pointer Dereference.
    * BID-46429: PHP 'grapheme_extract()' NULL Pointer Dereference Denial Of 
      Service Vulnerability
    * CVE-2011-0420: ** RESERVED ** This candidate has been reserved by an 
      organization or individual that will use it when announcing a new 
      security problem. When the candidate has been publicized, the details 
      for this candidate will be provided.

Platforms Affected:

    * PHP PHP 5.3.5

Reported:

Feb 17, 2011

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 
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author/distributor (IBM Internet Security Systems X-Force) be held liable for 
any damages whatsoever arising out of or in connection with the use or spread 
of this information.

For corrections or additions please email xforce@iss.net

* According to the Forum of Incident Response and Security Teams (FIRST), the 
Common Vulnerability Scoring System (CVSS) is an "industry open standard 
designed to convey vulnerability severity and help to determine urgency and 
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OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.

The information within this database may change without notice. Use of this 
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NO warranties, implied or otherwise, with regard to this information or its 
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About IBM Internet Security Systems

IBM Internet Security Systems is a trusted security advisor to thousands of 
the world's leading businesses and governments, helping to provide 
pre-emptive protection for networks, desktops and servers. The IBM Proventia
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or call 800-776-2362.

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