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                         AUSCERT Security Bulletin

                               ASB-2009.1173
                   PHP 5.2.12: Multiple vulnerabilities
                             31 December 2009

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

Product:              PHP 5.2.x prior to 5.2.12
Operating System:     Windows
                      UNIX variants (UNIX, Linux, OSX)
Impact/Access:        Denial of Service    -- Remote/Unauthenticated      
                      Cross-site Scripting -- Remote with User Interaction
                      Reduced Security     -- Remote/Unauthenticated      
Resolution:           Patch/Upgrade
CVE Names:            CVE-2009-4143 CVE-2009-4142 CVE-2009-4017
                      CVE-2009-3558 CVE-2009-3557 
Member content until: Saturday, January 30 2010

OVERVIEW

        PHP 5.2.12 has been released correcting several security 
        vulnerabilities.


IMPACT

        The vendor has provided the following information regarding these
        vulnerabilities:
        
            * "Fixed a safe_mode bypass in tempnam() identified by Grzegorz 
              Stachowiak. (CVE-2009-3557, Rasmus)" [1]
            * "Fixed a open_basedir bypass in posix_mkfifo() identified by 
              Grzegorz Stachowiak. (CVE-2009-3558, Rasmus)" [1]
            * "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, 
              identified by Bogdan Calin. (CVE-2009-4017, Ilia)" [1]
            * "Added protection for $_SESSION from interrupt corruption and 
              improved "session.save_path" check, identified by Stefan 
              Esser. (CVE-2009-4143, Stas)" [1]
            * "Fixed bug #49785 (insufficient input string validation of 
              htmlspecialchars()). (CVE-2009-4142, Moriyoshi, hello at 
              iwamot dot com)" [1]


MITIGATION

        PHP v5.2x users can download the latest version from the vendor's
        website. [2]


REFERENCES

        [1] PHP 5.2.12 Release Announcement
            http://www.php.net/releases/5_2_12.php

        [2] PHP 5.2.12
            http://www.php.net/downloads.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

===========================================================================
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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