Bug Id
6359212

Product
Solaris 10 Operating System
OpenSolaris

Date of Resolved Release
09-Mar-2009

Security vulnerability in the Solaris NFS server security modes (nfssec(5)) may lead to unauthorized access to shared resources:

1. Impact

A security vulnerability in the Solaris NFS server may lead to unauthorized access to file systems shared via NFS if those resources are shared using a combination of "none" (AUTH_NONE) and "sys" (AUTH_SYS) (see nfssec(5)) security modes.

2. Contributing Factors

This issue can occur in the following releases:

SPARC Platform

• Solaris 10 without patch 139462-02
  
• OpenSolaris based upon builds snv_01 through snv_110

x86 Platform

• Solaris 10 without patch 139463-02
• OpenSolaris based upon builds snv_01 through snv_110

Note 1: Solaris 8 and Solaris 9 are not impacted by this issue.

Note 2: Only NFS servers which export shares with AUTH_NONE used in combination with the security mode AUTH_SYS are impacted by this issue. To determine if a system is configured to run as an NFS server (see smf(5)), the following command  can be used:

    $ svcs nfs/server
    STATE      STIME        FMRI
    online     14:30:59     svc:/network/nfs/server:default

To determine if a system exports shares that have AUTH_NONE used in combination with AUTH_SYS, run the following command on the server (see share_nfs(1M)):

    $ share
    - /var/tmp sec=sys,rw=authorized-host,sec=none,ro

If the output of the share(1M) command includes NFS shares with "sec=sys" and "sec=none", then the NFS server shares resources with AUTH_NONE used in combination with the security mode AUTH_SYS.

Note 3: OpenSolaris distributions may include additional bug fixes above and beyond the build from which it was derived.  To determine the base build of OpenSolaris, the following command can be used:

    $ uname -v
    snv_86

3. Symptoms

There are no predictable symptoms that would indicate the described vulnerability has been exploited to gain unauthorized access to exported data.

4. Workaround

To avoid this issue until patches can be applied, do not export NFS shares on the NFS server using AUTH_NONE and AUTH_SYS in combination.

5. Resolution

This issue is addressed in the following releases:

SPARC Platform

• Solaris 10 with patch 139462-02 or later
  
• OpenSolaris based upon builds snv_111 or later
  

x86 Platform

• Solaris 10 with patch 139463-02 or later
  
• OpenSolaris based upon builds snv_111 or later

For more information on Security Sun Alerts, see 1009886.1.

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References

139462-02
139463-02





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