Category
Security
Release Phase
Resolved
Bug Id
6808437
ProductSolaris 10 Operating System
OpenSolaris
Date of Resolved Release30-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.
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References
139991-03
140109-03
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