Note: This is an archival copy of Security Sun Alert 262668 as previously published on http://sunsolve.sun.com.|
Latest version of this security advisory is available from http://support.oracle.com as Sun Alert 1020673.1.
Solaris 10 Operating System
Date of Resolved Release
Security Vulnerability in the Solaris Network File System Version 4 (NFSv4) 'nfs_portmon' Tunable May Allow Unauthorized Network Access
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:
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 43. 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 -v3. Symptoms
There are no predictable symptoms that would indicate the described issue has occurred.
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.
This issue is addressed in the following releases:
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