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AA-2009.0111                  AUSCERT Advisory

                                  [Linux]
                       kernel: Inappropriate Access
                                8 May 2009
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        AusCERT Advisory Summary
        ------------------------

Product:              kernel
Operating System:     Linux variants
Impact:               Inappropriate Access
Access:               Existing Account
CVE Names:            CVE-2009-1184
Member content until: Friday, June 05 2009

OVERVIEW:

      A vulnerability has been identified in the SELinux subsystem in the 
      Linux kernel. 


IMPACT:

      The vendor describes the vulnerability as:

      "unreached code in selinux_ip_postroute_iptables_compat() 
      (CVE-2009-1184)." [1]
      

      The National Vulnerability Database [2] describes the issue as:

      "The selinux_ip_postroute_iptables_compat function in 
      security/selinux/hooks.c in the SELinux subsystem in the Linux kernel 
      before 2.6.27.22, and 2.6.28.x before 2.6.28.10, when compat_net is 
      enabled, omits calls to avc_has_perm for the (1) node and (2) port, 
      which allows local users to bypass intended restrictions on network 
      traffic." [3]

     
MITIGATION:

      This issue has been fixed in kernel versions 2.6.27.22 and 
      2.6.28.10.


REFERENCES:

      [1] unreached code in selinux_ip_postroute_iptables_compat()
          http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.27.y.git;a=commit;h=910c9e41186762de3717baaf392ab5ff0c454496

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

      [3] Vulnerability Summary for CVE-2009-1184 
          http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2009-1184

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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