Note: This is an archival copy of Security Sun Alert 262788 as previously published on http://sunsolve.sun.com.|
Latest version of this security advisory is available from http://support.oracle.com as Sun Alert 1020679.1.
Solaris 10 Operating System
Date of Resolved Release
Security Vulnerability in Solaris NFSv4 Kernel Module May Panic an NFSv4 Client System
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
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"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 -v3. Symptoms
Should the described issue occur, the NFSv4 client system may panic with a stack trace similar to the following:
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.
This issue is addressed in the following releases:
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