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                         AUSCERT Security Bulletin

                              ASB-2009.1136.2
                            PHP 5.3.1 Released
                             24 November 2009

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

Product:              PHP 5.3.1
Operating System:     Windows
                      UNIX variants (UNIX, Linux, OSX)
Impact/Access:        Denial of Service -- Remote/Unauthenticated
                      Reduced Security  -- Remote/Unauthenticated
Resolution:           Patch/Upgrade
CVE Names:            CVE-2009-4017 CVE-2009-3559 CVE-2009-3558
                      CVE-2009-3557  
Member content until: Sunday, December 20 2009

Revision History:     November 24 2009: Added CVE References
                      November 20 2009: Initial Release

OVERVIEW

        PHP 5.3.1 has been released, including several security fixes.


IMPACT

        According to the vendor[1], the following security fixes are available
        in this version of PHP:
        
          * Added "max_file_uploads" INI directive, which can be set to 
            limit the number of file uploads per-request to 20 by default,
            to prevent possible DOS via temporary file exhaustion.
        
          * Added missing sanity checks around exif processing.
        
          * Fixed a safe_mode bypass in tempnam().
        
          * Fixed a open_basedir bypass in posix_mkfifo().
        
          * Fixed bug #50063 (safe_mode_include_dir fails).
        
        Many other non-security related fixes are also included in this
        version.


MITIGATION

        Users of PHP 5.3.0 should upgrade to 5.3.1. Users of PHP 5.2 may need
        to evaluate changes between the two versions before upgrading.


REFERENCES

        [1] PHP 5.3.1 Release Announcement
            http://www.php.net/releases/5_3_1.php

AusCERT has made every effort to ensure that the information contained
in this document is accurate.  However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours 
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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