Category
Security
Release Phase
Resolved
Bug Id
6847540
ProductSolaris 10 Operating System
OpenSolaris
Date of Resolved Release15-Jul-2009
Security Vulnerability in Solaris NFSv4 Kernel Module May Panic an NFSv4 Client System
1. Impact
A security vulnerability in the Solaris NFSv4 kernel module may allow a
local unprivileged user to panic an NFSv4 client system, thereby
leading to a Denial of Service (DoS) condition.
2. Contributing Factors
SPARC Platform
- Solaris 10 with patch 139466-02 or later and without patch 141733-03
- OpenSolaris based upon builds snv_102 through snv_119
x86 Platform
- Solaris 10 with patch 139467-02 or later and without patch 141734-03
- OpenSolaris based upon builds snv_102 through snv_119
Notes:
1. Solaris 8 and 9 are not impacted by this issue
2. Only those systems which have NFSv4 mounted file systems are
impacted by this issue.
To determine if a system has NFSv4 mounted file systems, the following
command may be executed:
$ nfsstat -m | grep "vers=4"
Flags: vers=4,proto=tcp,sec=sys,hard,intr,link,symlink,acl,rsize=1048576,wsize=1048576,retrans=5,timeo=600
NFSv4 mounted file systems include a "vers=4" field in the output of
the nfsstat(1M) command.
3. OpenSolaris distributions may include additional bug fixes above and
beyond the build from which it was derived. The base build can be
derived as follows:
$ uname -v
snv_101
3. Symptoms
Should the described issue occur, the NFSv4 client system may panic
with a stack trace similar to the following:
unix:die()
unix:trap()
unix:ktl0()
nfs:fn_move()
nfs:nfs4rename_persistent_fh()
nfs:nfs4rename()
genunix:fop_rename()
genunix:vn_renameat()
genunix:rename()
4. Workaround
To avoid this issue, use NFSv3 instead of NFSv4. The NFS client system
can be configured not to use NFSv4 by setting NFS_CLIENT_VERSMAX=3 in
/etc/default/nfs. Please refer to nfs(4) documentation.
5. Resolution
This issue is addressed in the following releases:
SPARC Platform
- Solaris 10 with patch 141733-03 or later
- OpenSolaris based upon builds snv_120 or later
x86 Platform
- Solaris 10 with patch 141734-03 or later
- OpenSolaris based upon builds snv_120 or later
For more information on
Security Sun Alerts, see 1009886.1.
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notification is being provided to you on
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Copyright 2000-2009 Sun
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Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved.References
141733-03
141734-03
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