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

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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 Technical Instruction ID 213557.

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