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AA-2009.0004                  AUSCERT Advisory

                                  [Linux]
                       Linux Kernel 2.6.28 Released
                              5 January 2009
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        AusCERT Advisory Summary
        ------------------------

Product:              kernel
Operating System:     Linux variants
Impact:               Denial of Service
Access:               Existing Account
CVE Names:            CVE-2008-5700
Member content until: Monday, February 02 2009

OVERVIEW:

       A vulnerability has been corrected in the latest Linux Kernel.


IMPACT:

       The National Vulnerability Database [1] has assigned CVE-2008-5700 
       to this vulnerability:

       CVE-2008-5700: libata in the Linux kernel before 2.6.27.9 does not 
       set minimum timeouts for SG_IO requests, which allows local users to 
       cause a denial of service (Programmed I/O mode on drives) via 
       multiple simultaneous invocations of an unspecified test program. 
       [2]

       Kernel.org have confirmed its fix in the change log for 2.6.28:
    
       Add a BLK_MIN_SG_TIMEOUT to match the existing 
       BLK_DEFAULT_SG_TIMEOUT. [3]


MITIGATION:

       Upgrade to Linux Kernel version 2.6.28 or later to patch this
       vulnerability.


REFERENCES:
     
       [1] National Vulnerability Database
           http://nvd.nist.gov

       [2] Vulnerability Summary for CVE-2008-5700 
           http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2008-5700

       [3] Kernel.org ChangeLog-2.6.28
           http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.28

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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