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                         AUSCERT Security Bulletin

                              ASB-2009.1170.2
                Symlink Vulnerability corrected in XFS acl
                             30 December 2009

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

Product:              XFS acl
Operating System:     UNIX variants (UNIX, Linux, OSX)
Impact/Access:        Increased Privileges -- Existing Account
Resolution:           Patch/Upgrade
CVE Names:            CVE-2009-4411  
Member content until: Saturday, January 23 2010

Revision History:     December 30 2009: Added CVE Reference
                      December 24 2009: Initial Release

OVERVIEW

        A security vulnerability has been corrected in XFS acl.


IMPACT

        The vulnerability, which has been confirmed [1], can result in 
        increased privileges of existing accounts through symlink attacks.


MITIGATION

        This vulnerability has been corrected in version 2.2.49 [1].


REFERENCES

        [1] getfacl 2.2.47 follows symlinks, even without -L
            http://oss.sgi.com/bugzilla/show_bug.cgi?id=790

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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