Apple Mac OS X "disk://" URI handler stores arbitrary files in a known location

ID VU:210606
Type cert
Reporter CERT
Modified 2006-05-01T19:31:00



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 Information


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__ Apple Computer, Inc.

Updated: May 21, 2004


__ Unknown

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.


US-CERT has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

CVSS Metrics

Group | Score | Vector
Base | N/A | N/A
Temporal | N/A | N/A
Environmental | | N/A


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Thanks to Kang for reporting this vulnerability.

This document was written by Jason A Rafail of CERT/CC and is based on information from and

Other Information

CVE IDs: | None
Severity Metric:** | 18.00
Date Public:
| 2004-05-17
Date First Published: | 2004-05-21
Date Last Updated: | 2006-05-01 19:31 UTC
Document Revision: | 10