It was discovered that nfs-utils did not properly enforce netgroup restrictions when using TCP Wrappers. Remote attackers could bypass the netgroup restrictions enabled by the administrator and possibly gain access to sensitive information.
The problem can be corrected by updating your system to the following package versions:
4 December 2008
A security issue affects these releases of Ubuntu and its derivatives:
It was discovered that nfs-utils did not properly enforce netgroup restrictions when using TCP Wrappers. Remote attackers could bypass the netgroup restrictions enabled by the administrator and possibly gain access to sensitive information.
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system upgrade you need to restart nfs services to effect the necessary changes.
Vulmon