oss-security - CVE Request: VirtualBox tmp file issue

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Date: Mon, 24 Nov 2008 16:34:07 +0100
From: Ludwig Nussel <ludwig.nussel@...e.de>
To: cve@...re.org
Cc: oss-security@...ts.openwall.com
Subject: CVE Request: VirtualBox tmp file issue

Hi,

http://www.virtualbox.org/wiki/Changelog:
VirtualBox 2.0.6
- Linux/Solaris/Darwin hosts: verify permissions in /tmp/vbox-$USER-ipc

These changes match that description:
http://www.virtualbox.org/changeset?new=trunk%2Fsrc%2Flibs%2Fxpcom18a4%2Fipc%2Fipcd%2Fdaemon%2Fsrc%2FipcdUnix.cpp%4013810&old=trunk%2Fsrc%2Flibs%2Fxpcom18a4%2Fipc%2Fipcd%2Fdaemon%2Fsrc%2FipcdUnix.cpp%407049

VirtualBox uses /tmp/vbox-$USER-ipc to store a socket and a lock
file. The lock file is truncated after a simple open call. AFAICS
creating /tmp/vbox-$USER-ipc before the victim starts VirtualBox
could therefore be exploited to create files as the victim or
truncate files of the victim.

cu
Ludwig

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