A vulnerability has been reported in the default "disk://" protocol handler installed on Apple Mac OS X systems. Remote attackers may potentially use this vulnerability to create files on the local system without explicit user consent. We have not independently verified the scope of this vulnerability report.
A vulnerability has been reported in the Apple Mac OS X default "disk://" URI Handler. If able to entice a user to visit a foreign web site, a remote attacker may potentially be able to download any arbitrary file to a known location on the local system. If the file is a disk image (".dmg"), it could be automatcially mounted as a disk volume available for use by an attacker. A separate vulnerability, VU#578798, has also been reported which may allow a remote attacker to execute arbitrary application files contained within a mounted disk image.
Browser or applications supporting "disk://" URIs.
A remote attacker may be able to download arbitrary files to a known location on a potentially vulnerable system.
Security Update 2004-06-07 has been released for the following system versions:
* Mac OS X v10.3.4 "Panther" * Mac OS X Server v10.3.4 "Panther" * Mac OS X v10.2.8 "Jaguar" * Mac OS X Server v10.2.8 "Jaguar"
This update removes the "disk://" URI handler.
According to the posting on Secunia, implementing all three of the following steps may mitigate this vulnerability:
1) Uncheck ("Open 'safe' files after downloading");
2) Change the protocol helpers (applications) for URI handlers which are not required, e.g., disable the "help://" handler;
3) Add a separate protocol helper (application) for "disk".
Vendor| Status| Date Notified| Date Updated
Apple Computer, Inc.| | -| 21 May 2004
If you are a vendor and your product is affected, let us know.
Group | Score | Vector
Base | N/A | N/A
Temporal | N/A | N/A
Environmental | N/A | N/A
Thanks to Kang for reporting this vulnerability.
This document was written by Jason A Rafail of CERT/CC and is based on information from Secunia.com and SecurityTracker.com.