Bug Id
6808437

Product
Solaris 10 Operating System
OpenSolaris

Date of Resolved Release
30-Jun-2009

Security Vulnerability in the Solaris Network File System Version 4 (NFSv4) 'nfs_portmon' Tunable May Allow Unauthorized Network Access

1. Impact

A security vulnerability in the Solaris NFSv4 Server Kernel Module 'nfs_portmon' tunable may allow certain remote unprivileged users to gain unauthorized network access to share resources, thereby allowing those users to access (read and write) arbitrary files.

Sun acknowledges with thanks, Anton Lundin for bringing this issue to our attention

2. Contributing Factors

This issue can occur in the following releases:

SPARC Platform

• Solaris 10 without patch 139991-03
• OpenSolaris based upon builds snv_01 through snv_118

x86 Platform

• Solaris 10 without patch 140109-03
• OpenSolaris based upon builds snv_01 through snv_118

Notes:

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

2. This issue only occurs on systems that are configured as an NFSv4 server. To determine if a system is configured as an NFSv4 server, the following command can be run:

$ rpcinfo -l localhost nfs 4
program vers  tp_family/name/class    address      service
100003  4    inet6/tcp/cots_ord      ::1.8.1       nfs

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 run:

$ uname -v
snv_116

3. Symptoms

There are no predictable symptoms that would indicate the described issue has occurred.

4. Workaround

To work around the described issue, the NFS server system may be configured not to use NFSv4 by setting "NFS_SERVER_VERSMAX=3" in "/etc/default/nfs". For additional information, please refer to the nfs(4) documentation.

5. Resolution

This issue is addressed in the following releases:

SPARC Platform

• Solaris 10 with patch 139991-03 or later
• OpenSolaris based upon builds snv_119 or later

x86 Platform

• Solaris 10 with patch 140109-03 or later
• OpenSolaris based upon builds snv_119 or later

For more information on Security Sun Alerts, see 1009886.1.

This Sun Alert notification is being provided to you on an "AS IS" basis. This Sun Alert notification may contain information provided by third parties. The issues described in this Sun Alert notification may or may not impact your system(s). Sun makes no representations, warranties, or guarantees as to the information contained herein. ANY AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT YOU ACKNOWLEDGE THAT SUN SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN. This Sun Alert notification contains Sun proprietary and confidential information. It is being provided to you pursuant to the provisions of your agreement to purchase services from Sun, or, if you do not have such an agreement, the Sun.com Terms of Use. This Sun Alert notification may only be used for the purposes contemplated by these agreements.

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References

139991-03
140109-03





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