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AA-2008.0012 -- [Linux] -- Permission Bypass Vulnerability in Linux Kernel

Date: 17 January 2008
References: ESB-2008.0083  ESB-2008.0098  ESB-2008.0108  

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AA-2008.0012                  AUSCERT Advisory

                                  [Linux]
              Permission Bypass Vulnerability in Linux Kernel
                              17 January 2008
- ---------------------------------------------------------------------------

        AusCERT Advisory Summary
        ------------------------

Product:              Kernel
Operating System:     Linux variants
Impact:               Inappropriate Access
                      Increased Privileges
Access:               Existing Account
CVE Names:            CVE-2008-0001
Member content until: Thursday, February 14 2008

OVERVIEW:

        An unauthorised file access vulnerability has been reported in the
        Linux kernel prior to 2.6.23.14 due to an error in the VFS (Virtual
        File System) module 


IMPACT:    

        The National Vulnerability Database [1], gives the following
        information regarding these vulnerabilities:

        o CVE-2008-0001: "VFS in the Linux kernel before 2.6.23.14 performs 
          tests of access mode by using the flag variable instead of the 
          acc_mode variable, which might allow local users to bypass file 
          permissions." [2]

        Successful exploitation of this vulnerability would enable the 
        attacker to access files and services not authorised to them which
        could lead to further more serious attacks.


MITIGATION:

        This issue has been corrected in the latest Linux Kernel [3], which
        is available for download from the Linux Kernel Archives. [4]


REFERENCES:

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

        [2] National Vulnerability Database (CVE-2008-0001)
            http://nvd.nist.gov/nvd.cfm?cvename=CVE-2008-00001

        [3] Linux 2.6.23.14 Changelog
            http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.23.14

        [4] Linux Kernel 2.6.23.14 (Download Link)
            http://www.kernel.org/pub/linux/kernel/v2.6/patch-2.6.23.14.bz2

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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